The Holy Grail Of Rotary Engines - SkyActiv-X
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- เผยแพร่เมื่อ 4 ก.ค. 2024
- A SkyActiv-X Rotary Engine Could Mean An Efficient Wankel Engine
Holy Grail Of Gas Engines: SPCCI - • Mazda Creates The Holy...
How SkyActiv-X Engines Work - • How Mazda Is Saving Th...
Will Mazda create the holy grail of rotary engines? It was reported by Jalopnik that the VP of R&D for Mazda said there was a chance SkyActiv-X strategies could be applied to future rotary engines. In this video, we'll look at what changes to the rotary engine could result in great efficiency. This includes changes to the compression ratio, fuel injection, SPCCI lean-style combustion, superchargers, and using a pressure sensor to optimize ignition timing.
Jalopnik Article On The SkyActiv-X Rotary Engine:
jalopnik.com/mazda-may-apply-...
From Mazda's Press Release regarding SkyActiv-X:
- SKYACTIV-X is the world’s first commercial gasoline engine to use compression ignition, in which the fuel-air mixture ignites spontaneously when compressed by the piston
- A proprietary combustion method called Spark Controlled Compression Ignition overcomes two issues that had impeded commercialization of compression ignition gasoline engines: maximizing the zone in which compression ignition is possible and achieving a seamless transition between compression ignition and spark ignition.
- This new proprietary combustion engine combines the advantages of gasoline and diesel engines to achieve outstanding environmental performance, power and acceleration performance.
- Compression ignition and a supercharger fitted to improve fuel economy together deliver unprecedented engine response and increase torque 10-30 percent over the current SKYACTIV-G gasoline engine.3
- Compression ignition makes possible a super lean burn4 that improves engine efficiency up to 20-30 percent over the current SKYACTIV-G, and from 35-45 percent over Mazda’s 2008 gasoline engine of the same displacement. SKYACTIV-X even equals or exceeds the latest SKYACTIV-D diesel engine in fuel efficiency.
- With high efficiency across a wide range of rpms and engine loads, the engine allows much more latitude in the selection of gear ratios, providing both superior fuel economy and driving performance.
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Holy Grail Of Gas Engines: SPCCI - • Mazda Creates The Holy...
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*Important Note!* As pointed out in the comments (thanks all!) there is a mistake in the video. By changing the size of the cavity in the rotor, you will change the compression ratio, but you *will not* change the displacement (as I incorrectly stated in the video). Let's talk it through... The volume of the combustion chamber is obviously larger if the rotor has larger cavities, which lead me to the displacement comment. But if you have a piston-cylinder engine and remove part of the piston, the displacement is simply measuring the swept volume of the piston's travel, which won't change if you change the piston's shape. Applying this to the rotary, and looking at maximum chamber volume minus minimum chamber volume, the number should not change depending on the rotor cavity. So compression ratio will change (much like a piston cylinder engine with an altered piston), however displacement will not.
I was wondering if you mixed that up, math doesn't lie. Also, I have a new suggestion: how propane improves diesel performance.
Oh c'mon admit it you ignored this fact by not thinking this through before releasing the video. Mistakes are indeed made and if you 're learning from them, its gold. Oh..... and by the way... you can't have variable compression ratio on a rotary engine... at least with existing designs... but then it should become really complex.
I even can't ride bicycle but somehow i love cars
Thanks for putting it in the comments section and not doing another 10min video.
(Not that your videos are bad.)
Sky active is making fossil fuels great again.
Rotary Engine: "I'm tired" . Mazda: "Shut up, we're not done with you yet"
No it's a New design only for hybrid vehicles.
@@petfashi.c0m672 but will it be small enough to put on a go kart?
@@alexzanderroberts995 I fear the cart with this thing in it. You my friend are insane!
the rotary has so many design problems that remain unsolved like having seals that are as durable and reliable as piston-engine rings and seals, oil consumption, fuel economy, etc.
but there is a "Liquid-Piston" rotary engine currently under development (not by Mazda) that seems promising. DARPA even threw-in some of its funds on it.
@@alexzanderroberts995 Sachs use to make go kart and snowmobile rotary engines like 40 years ago, I think up until the 1980s, maybe 1970s. They were quite popular.
That model is awesome! The LED indicating whether its in compression, combustion, exhaust or intake is so brilliant. Love it!
Dutmaster I totally agree!
The LED lighting is definitely cool and makes it easier to teach someone about the cycles.
I hope he comes out with a coloring book soon. 😭😂
@SMOG I think in the first video where he used it, he provided a link to where 3d printing plans could be downloaded
IT is for sale for a friendly price of 499$ mates ! GET YOURS NOW !
just kidding !
When you realize the rotary engine display is physically there lol
Truth...
Right! No clickbate!
It also has lights and electric motor!! I think this guy loves the rotary more than he lets on.... ;-) Probably has it on his bed side table a night time.
lmao, i was stoned and had the same thought xD
I'm a simple man I see rotary I hit like
I'm a simple man, is dead please stop.
I hit like....
I’m a simple man, I see this comment format I get annoyed
@@martinda7446 - He hit like - the 32nd gender...
i am simple man.
i see people commenting, so i comment too
Spinning Dorito power 💪
mrbubbles720 go home your hungry
Too much Doritos, now we need spinning Pepto Bismol power!😂
Chicken cooker :D
there is no substitute for cc's..
@@andrewpuckridge7633 Ohh I get that one hahahahaha
Yes, let the Wankel engine live on.
No, let the boat anchor sink.
WHY THO.
There is something i always wondered, how do make a true wankel diesel engine without the use of a supercharger? I read that there was one actual production design from a manufacturer called
PATS but i can't find any descriptions or drawings of the design, does anybody know more about that? Also, i know the Rolls Royce had a diesel wankel prototype but that version had a second rotor for precompression.
@@GunsNBudder principles of mass production and reliability.
@@mandernachluca3774 imagine a diesel one . There was that Boat engine one that was 3000hp but nothing came of it . And if Only rollsroyce continued like Mazda did .
If Mazda brought back the WANKEL engine, I would be excited to see that performance. Here are my fingers crossed for a modern Wankel engine one day.
Bring back the wanker engines
I enjoy my RX-8 every day. A little Idemitsu pre-mix in every fill-up, and it should last at least until gas gets too expensive.
Jeffiekins Glad, to hear. I love rotary engines but wouldn’t want the reliability issues. :(
@@WarriorsPhoto if you handle it well, there are no issues. Remember that if you don't take care of your standard engine it will have reliability issues too :)
@@jakubcislo8029 BUT, of course. What we put into something we'll get back. Thank you for your input.
It's about time Jason makes a mistake in a video. It makes me feel better about myself.
Haha, sometimes I have to make a whole new video because I was so wrong: th-cam.com/video/7E-LSkwmBvk/w-d-xo.html
Trying my best!
What ! A engineer admits being wrong? Never hear of this🤔😂
@@EngineeringExplained , you surely DON'T have to remake it. Your immediadte response compleeeetely redeems you!
I believe he did. At 2:03 on he says that the cavity in the rotor increases the displacement of the engine, so if you fill in that cavity you're going to be reducing the overall displacement of the engine, and therefore, if you want the same displacement you'll have to increase the engine size overall. However, the volume of that cavity is rather modest compared to the volume of the intake chamber, so by filling in that cavity you won't lose much displacement. On the other hand, if you increase the engine compression ratio you'll be able to get more power out of the same or even smaller displacement. I believe the reason that cavity exists has little to do with increasing the engine displacement, but rather it's to do with optimising the shape of the combustion chamber. A more concave and compact combustion chamber allows for a quicker and more efficient and thorough fuel combustion.
@@Johndeere42302008 Honestly I think only incompetent people don't admit to being wrong. Good engineers are wrong all the time and good engineers own up to it. I'm a young engineer and I'm probably wrong 7 or 8 times out of 10.
Often thought that a rotary engine coupled with an in-line electric motor/generator would make a great hybrid in terms of performance and efficiency.
The torque of an electric motor would complement a rotary well.
Mazda have already done that. They use a single rotor engine lying horizontally to power the motor. IIRC, they have several such-powered cars on loan to government agencies in Tokyo.
Its not electric but look up the "duke" motor,,thank me later
Nope: “Gas Turbines are among the most efficient internal combustion engines. The General Electric 7HA and 9HA turbine combined cycle electrical plants are rated at over 61% efficiency.”
@@jacekpiterow900 Not scalable to economy-hybrid car sizes. We need a back-up engine of about 12 HP that's also emissions friendly on cold start-ups.
Yeah but don’t let this video take you off of the fact that Rob Dahm’s 4 Rotor still isn’t done.
There is a guy who made his own 4 rotor fc3s, I think he is in Holland. It's on buildthreads somewhere. Well worth a read.
Ollie S thanks
It's not just a typical 4 rotors mates, this is why it's not done yet. It's a fully hand-made AWD 4-rotors, and that is not as simple as just put one more rotor or two, to your base project.
The worst thing occurring now is, the fact that he just let go his 3-rotors blown, because of his fancy surge tank put in raw without major setting on flowrate/pressure (imho btw) etc...
And of course, despite the fact that its hurt his feeling pretty much in the heart, as we could all see in different videos after it happen.
But hey, still liking his crazy and shard N°1 project, tho ! Rob if you ever read this or EE or .. whatever ..
ForAl lMankind Still he’s had at least 2 years.... that right there goes to show and the money he’s invested into the project. People pay to see things get done... and it’s been at least a month since the last update video. Abel already built a 4 rotor so this should be nothing new. The drivetrain is already finished, the motor is merely finished, the body is finished, and the interior doesn’t take long, the car is basically finished so. I’m just saying if it were me I’d invest all my time and effort into something the people (his TH-cam channel) actually want to see instead of the 3 rotor.
@@alexanderswander8176 I think there's still a decent amount of work to be done, some driver-related positioning, etc. It is a very complex build - an AWD four rotor, first of its design. Rob wants to do it right, not hack-job it. He wants the first in the world to be a marvel. He's expressed that he wants to take as much time needed to make it right, and besides, that's his project, it's not so much he's making it for TH-cam, it's his personal, dream project. ...though, it has been a while.. but perfection takes time! I personally can't wait to see it and I get excited over any updates he puts out. I'm used to seeing build threads take months, years to be done, a guy on rx7club is still making his grand tourer type 1st gen even after a couple years. For a build as complex and first-of-its-kind as Rob's, I'm not surprised it's taking a while, and people should understand.
So basically they could turn the standard Dorito into a super saiyan dorito
Mizan Ali the world’s spiciest Doritos
On a recent channel survey to list your favorite channels I had to mention you. This content is amazing the model engine is superb. Thanks for taking the time to bring us videos this amazing! Great video as usual.
Happy to hear it, glad you enjoy the channel and thanks for watching/recommending it to others!
@@EngineeringExplained Will do thank you good Sir!
@@EngineeringExplained what ever happened to you, chrisfix and Eric the car guy teaming up?
What they said.
@@lowe1988 We all live in different states haha, so it's rare we film together.
The commercial with kid who has a time machine that "runs on Doritos" is all the evidence I need that there will be rotaries in the future.
I'm so jealous you have that rotary engine 3D printed model.
ravioliwheresthespaghetti just 3d print one yourself
I'll print the parts for you
@@MilesPrower1992 Bet
I remember there was a hydrogen powered rx-8 back in the day, and got my hopes up.. also I think that a powerful rotary engine mated with an efficient hybrid system could do well in an exotic car wich is driven sparingly to begin with. Id love to see a mid-engined car with say, a 4 rotor engine and some electric motors to help with low end torque. Just a thought
Wow and wouldn’t that be really great if they put this in a production vehicle and call it, I don’t know, the RX-9? Woah! 😂 Great video as always Jason! Enjoy the engineering geek out session; I always learn something new!
Such a great looking concept, make it happen Mazda!!
I dont think we'll ever seen a RX9. Shamefully
@@marfrandema1884 I thought it's going to be a Hybrid with a Rotary as generator? Why shouldn't that be possible
rx vision concept car has been around since 2016
What about RX-IX?
I remember hearing those rumours back in 2011.
I remember this as well, they called it the X16.
It was on the Mazda's website back then as well.
Ungregistered User I don’t recall those rumours till about 2015
@@ChiefyBeats i dont think they were LEGITIMATE rumors until 2015 but people have been hypothetically and wishfully talking about corvettes being mid engined for decades.
The 16X has been in development since about 2008.
Aruch H- 16x
I felt there was a few times that this was a mix between a radar forecast and training video. In my head I played out some hot / cold fronts moving into the chambers.
Really well done as always!
Thank you Jason your explanation + that rotary cutout is now my go-to video from now on when someone with little idea of how a rotary engine works tries to explain to me how they work.I owe you one!!
I learn something new every time I watch one of your videos.
Happy to hear it Kevin, that's the goal! :)
This could be the SkyActiv-R Wankel engine that Mazda wants to make. They can apply all those points from the SkyActiv-X to improve rotaries in general, plus Mazda had build the 16X Wankel back in 2007 as a replacement to the 13B Renesis in the RX-8 and for an RX-9 successor. It was the first gasoline rotary with direct injection, has more displacement, a larger rotor radius, and eccentricity, but a reduced rotor width, and replaced the cast iron side housing plates with aluminum side housings to save weight. That engine was also in the Mazda Taiki concept car and hasn't been seen ever since. However, if Mazda is still working on Wankel engines, the 16X should be their project to start with and continue where they left off with the replacement to the legendary 13B engine after 40 years of service, beginning with the RX-4 in 1972 and ending with the Renesis for the RX-8 in 2012
Joshua Finley but is it even necessary to replace parts with aluminium? The rotary is so small already wouldn’t it be better to loose weight on other parts?
@@Otzkar For F1 cars it is...
Maybe, it's to have better thermal expansion due to aluminum's superior heat dissipating properties over cast iron. However, the rotors in the 16X remains cast iron, only the side housings are converted to aluminum. Also, the original 10A Wankel in the Cosmo Sport had aluminum side housings, but then changed to cast iron to cut costs and has been that way for all of Mazda's rotaries ever since. Personally, the rotors should also be aluminum to reduce heat and take weight off the eccentric shaft, bearings, and apex seals at high engine speeds
Joshua Finley yeah that makes a lot of sense
So just to nitpick, it wasn’t quite 40 years of 13B for Mazda.
They had the 12A engine prior to, I believe, 1983.
Thank you so much for your detailed explanation about the Skyactive-X engine (saw that video as well) and the possibility of applying those principles to the rotary engine.
The 26B had 3 spark plugs for each rotor. Compression ignition would be possible I think. Rotaries also work well with forced induction. Mazda, I'm sure, have been working on this for a while now. When they do release the new engine it will be excellent.
The only issue I see with using SPCCI in a rotary engine is that as you mentioned, SPCCI usually works best at lower RPMs and lower engine load. You mentioned the rotary would switch to twin spark plugs for a full otto cycle combustion under load and when power is demanded, but because rotaries need to wind out to create an amount of horsepower and torque comparable to a piston-cylinder engine, it might not work very efficiently/have many opportunities to run in SPCCI mode.
I wonder if they can set up the spark plugs like the 787B, have 3 and set it up the way Jason is talking about, have the one in the middle ignite for compression ignition in efficient mode, and in high engine load/high RPM, have all 3 ignite for full engine power
DORRRIIITTTOOO VVVTTEEECCC
I wrote my master’s thesis about this a few years ago. The theory is sound, but I suspect that HCCI is going to be really hard on apex and side seals due to the very fast pressure rise. An interesting concept nonetheless.
There are tons of turbo rotaries running 25-30lbs of boost up to 600hp... racing beat did that in the 90s! And tons of puerto ricans running 8 and 9 sec qtr mile. The pressure would not be an issue.
@@lolouro2266 the issue is longevity, racers rebuild after 4-6 runs, consumers want their engines to last 200,000 mi
Nice video. Great use of props! The colored lights are a really intuitive way to show what's going on.
i really love you man, youve taught me so much over the years
fantastic. this engine will prolong the life of combustion engines so we will all not have to rush out the exit door and buy an EV. This and more advanced hybrid technology is necessary to have a longer and smoother transition to EVs. I hope this engine will be able to run on regular 87 octane gas and also be reliable in very hot and cold climates and will last long without heavy maintenance costs over at least a 10 year period. I will consider buying a Mazda as soon as they make this available on the CX9. I am also hoping the torque is high enough to tow at least 5000 to 5500 lbs.
This video popped up randomly for me, but it seems really well done and was very interesting. Well done. 😊
Wow, am a Mazda salesman in the UK and right from the start have stated Skyactive X as the Holy Grail of engines now you've made it public good job!
Jason talking abt high compression ratios
Me chilling in my Mercedes at 21.5 to 1
diesel
"What could be" is how things like the Rotary are invented
Making a rotary efficient isn't all that hard.
It requires adding a timing chain and 3 more moving parts.
But because I don't have a degree or money, no one listens!
Glad you've got people's ears, you have an informing channel😊
Being a mechanic, always appreciated your videos which helps me understanding engineering part.
If perfected for sufficiently low emissions and high thermal efficiency, it could find a place as a range extender for EVs due to the compact size.
The MX-30 uses a rotary as a range extender. U happy?
This won't happen for a number of reasons you 've already pointed out on your previous videos:
1) Ignition & Power stroke occurs exclusively on one side. There is temperature difference on hot and cold side of the housing and this causes reliability issues. Might also hinder combustion efficiency. I wonder if this can be rectified by swapping hot and cold sides on the fly.
2) The motion of the rotary by design cannot produce enough useful work compared to a piston engine or even opposed piston engine.
3) You still have to lubricate inside the housing... This alone produces enough emissions when oil is burned.
Thank you. That's what I was thinking.😄
Spoken like a mechanic
The lubrication is the one I'd like to know more about. With higher compression, it should be possible to burn more of the oil and have less leave the tailpipe, but how eill that compare to an Otto cycle.
Apex seals will never seal the cylinder pressure with a 16:1. Discussion over.
The skyactive x engine is mechanically a diesel. Everything is stronger to handle the 2x higher pressures needed for ci to work. Trying to get a rotary to be that strong is fools errand.
@@crazyhass84 This. The seals have always been the weakest part of Wankel engines and it's improbable that Mazda could solve this problem and nearly impossible that they could solve it at a reasonable enough cost for production.
One of the best-explained video about complex topics. Good.
This is a super video by Jason explaining how the rotary works. That model is to die for as well. Only Jason, you state that (7:25) with a lean F/Air mix & added S Charger, the combustion temp reduces. This is not in line with what I have learned. Yet more air in the combustion chamber ought to lean the mix further. Have watched that part of the video over again. Have I missed something?? The Wankel Rotary Engine, like the Palleton winding system, is a stroke of utter genius. A Mazda RX8 is a rewarding drivers GT. There is a permanent place reserved for one in my dream garage of 4 cars.
Not really, this is more clickbait rumor material than real engineering..
What Jason said about combustion temperature is true comsidering that if such an engine did exist it would operate on the principle of Stratified Charge Mode combustion..
Very similar to the Diesel Cycle in many respects.
In particular that like the Diesel combustion temperature and pressure is reduced as the mixture is leaner and temperature goes up as the AFR is richer.
The Wankel KKM is a fascinating design but unfortunately it is inherently inferior to reciprocating and turbine engines which is why they are obsolete in the manufacturing industry today.
Don't expect to ever see Mazda bring back the Wankel, the company officially abandoned all development of Wankel engines in May 2009.
The story regarding the Skyactiv-X carrying over to the Wankel is just hypothetical conversation and was really badly misinterpreted by the media.
Man, you deserve to be a college professor! You are something like a walking encyclopedia about engineering...big thumbs up from me 👍
speculating and theorizing are not exactly the same. glad you did this video which explores novel plausible combination of existing technologies in a theoretical engine. Very different from unfounded speculation of random fanciful engine designs.
sorry but this guy fucked up, what he's saying is wrong due to a fundamental lack of understanding about what he's talking about
@ notmah,
atf has historically been used to break carbon lock on apex seals. If you are running a rotary with
header , remove the header and rotate the engine until each apex(each rotor) appears in the
exhaust port . using a long tool spring test the apex seal within its seat. Atf breaks this cabon
build up. I am looking for more testing (different rotaries/carb/FI ) for testing of my fuel
modifier. So far carb engine idle respond immediately while FI rotaries respond less so.
The modifier increases the duration of combustion to match the mechanical movement
of the rotor from combustion to exhaust. It does not increase power but improves
torque. You can gain a slight similar effect by delay ignition after top dead center ,
which in a rotor is when lead plug fires on timing mark.
Always great stuff on this channel!
Hey Jason, coud you do a video about available and/or possible ignition systems (like normal spark plugs, compression, laser ignited systems for example)? How they could work and what hinders them on being used on a regular basis. i recently discovered (for myself) the mwi ignition ag which try to use micro waves for ignition in ICE engines with impressive theoretical fuel and emission saving potential and I'd really like to hear your opinion about it.
Personally I love ICE engines and I don't believe yet that they are already pushed to their full envelope.
and thx for being here with us :)
Great suggestion!
@@EngineeringExplained Yes, I would REALLY like this too! From what I gather, MWI could potentially mitigate the rotary engines' inherent problem with flame front propagation. Perhaps it could even be tweaked for SPCCI (or MWPCCI as it would be) in the entire rev-range.
Amazing.
However still worried about how to overcome eapex seal wear!
You're taking the piss right? Apex seals haven't been an issue since the beginning of the 2000s. Any modern "apec issues" are due to oil problems.
Flash it, more oil less problem. Just make sure to keep adding oil to fill because it will burn a lot of oil
@@renderyours510 it became an issue in the FD era , not so much in the first or second gen cars
Great explanation, succinct with clear visuals, thanks. Always good to get something wrong as it gets us thinking ;)
Lovely you that's so keen and beautiful explaining. I loved the way it is shown too.Great keep going. 👍
Sorry, I haven't understand HOW the cavity in the Trochoïde makes or changes Displacement. (the compression ratio... yes, but Displacement ???)
Hmm, great question and a mistake on my part! Let's talk it through... The volume of the combustion chamber is obviously larger if the rotor has larger cavities, which lead me to the displacement comment. But if you have a piston-cylinder engine and remove part of the piston, you're simply measuring the swept volume of the piston's travel for displacement, which won't change if you change the piston's shape. Applying this to the rotary, and looking at maximum chamber volume minus minimum chamber volume, the number should not change depending on the rotor cavity. So compression ratio will change (much like a piston cylinder engine), however displacement will not.
Haven't they changed the 13B engines during the models?
I always thought that this cavitys are for more displacement too ( makes sense now why they are all still 1,3 liter ), but they put this cavitys into the rotors for what? Just to kill compression?
If the rx8 has 10:1 does the renesis rotary engine got this cavitys?
I dont know in which models this cavitys were used an dif they made them bigger or smaller on some models.
@@nsaal5400 piston cavities control airflow and mixing. 2nd thing they can be used for is dialing in compression ratio. As with everything in engineering its a balance.
@@nsaal5400
If you look real close you will notice that the cavity is the only way that the fuel and air mixture and combustion gasses are able to make it to the combustion region of the cycle and passed the lobe and wall interface.
@@davidscott5903 You're gotally right. How could I not notice that. I never thought of it but always wondered how it works with the chamber splitted. Thanks
I watched a video not too long ago that addressed a lot of the issues that they had with the older rotary and they re located the combustion chamber to the ends of the rotor and instead of in the center. Replaced the circular port for the spark plugs and made it a small slot the because what they found was causing the emission was that the compression was leaking from the compression side into the exhaust side with unburned fuel causing high exhaust temperatures and really bad emission after doing this they found the enging got better fuel economy lower emissions and made more power
Link if you could? Sounds interesting.
JZX TRD Exactly.
Always great to watch these explanations.
very instructive,as usual.Thanks
is anyone else wondering where to buy that rotary engine model???
Bonnie u have to build it yourself 3d print
@@nightmareinaction629 thought so, but i bet some company could make a lot producing these though
Where can I get one of those models
Dude that model is amazing. I was totally hypnotized by the light lol
I could sit and watch that engine model all day. I love Rotaries!
1:23 compression of 16!? Isn't that in diesel territory? How will knock play into this?
Air fuel ratio... Keep it lean and inject the rest when according to the pressure cycle.
Yes it is. Have u not watched any of the 100s of videos on the skyactiv X piston engine?!!! Its a ci engine that runs on gas! Hence 16 cr and spark plugs! Its genius. U should stop being so lazy and read up on it.
but one question remains the APEX SEALS
Replace every 100 km
Fixed
My question exactly
The longevity of the apex seals rely heavily on the engines lubrication system and methods to remove carbon build up (which would be like sand paper to the apex seals if not dealt with)
My answer is good maintenance! Easy as that!
i know that regular maintance can keep the sucker going for very long but it burns oil and makes the environmental scientists cry
Thanks for the great work, Jason! Speaking of rotary engines, have you heard about Ernie Brink’s ideas to improve the rotary engine? I do know it’s been a few years singe that was initially published (Autoline TV & others on YT), but can you do another video to explain these ideas and their actual potential! I’d love it! Thanks again for the great work! 😊
Unfortunately Mr. Brink (RIP) his rather outrageous claims did not pass the sniff test...
You cannot "offset" the pressure inside the combustion chamber as this clearly violates the Laws of Fluid Dynamics in particular _Pascals Law_
The slotted spark plug was an unsuccessful experiement, a paper was published in SAE, unfortunately Ernie didn't read it.
damn, jason. if you watch your old vids and the current ones there's been a clear improvement in how much you look at the camera (meaning you got more confidence). just wanted to say that, it's great.
Would love to see the return of a rotary.. as a hybrid with electric assist? Think of the high revving ease with which a gen set can be run to operate electric motors and keep small short term batteries or high density capacitors charged?
Back in the day, Maxda rotaries found themselves in Porsche 912 and 911, Fiat 124s, and countless other sport cars of the day. Nothing had the high revving power like these did... Emissions and seals did them in... I hope they can make this work.
Emissions is one thing, but with larger seal grooves, fantastic aftermarket ceramic seals, and a proper lubrication system, apex seals are a small worry now :)
Its on the way is strong rumor within industry. Till then we have excellent Skyactiv design to enjoy!
@Wipop Suppipat True. Always been a niche product for em & legacy thing. It's suppose to happen (an all new Rotary) w/prob some turbo/electric assist element.
Diesel is way worse in terms of emissions, except for CO2 which isn't even harmful. The reason why diesel has always gotten a free pass, especially in Europe, is because of lobbying. A certain fraction of the oil refining proces is diesel. This needs to be sold too. What better way than to create a market for it through legislation. At the same time the rotary engine got taxed twice as much as any other engine, in many countries :(
@engineeringexplained apparently microwave ignition is also a possibility for rotaries yielding up to a 30% improvement in fuel economy...
that's a wild claim
Microwave ignition? Quite interesting! Mind if I request your source, I'd love to read on that :-D
@@IkarimTheCreature Actually it isn't. The biggest problem of the rotary is flame front propagation. The flame front doesn't spread outward-and-onward like in a piston engine, but instead kinda tumbles over it self while it expands, leading to a lot of fuel not being ignited. MWI causes ignition pretty much everywhere at once, which makes it an ideal candidate for the rotary.
Ikarim sounds delicious
Hi @@andersjjensen, do you have knowledge on the subject of microwave ignition? I ask as I am working with a company that has developed spark ignited diesel rotaries (they transition to compression / auto ignition over about 30% load) we have integrated one into a boat - which has been entertaining...
Very very cool video, thanks for the explanation!
The SkyActive system sounds somewhat like Honda’s Activated Radical system for 2-cycle engines, which to my knowledge was only used commercially on the CRM250 enduro motorcycle of the late 90s (and which I owned for awhile). The shape/size of the exhaust port was modulated with a computer- and stepper-motor-controlled valve to raise compression and cause self ignition (dieseling) at light to moderate loads. It got at least 50% better mileage than similar 2-cycle bikes, but suffered from an implementation issue wherein that exhaust valve would oscillate, causing an overload of the stepper motor and computer shutdown. After three attempts to repair my bike (including drilling holes in the exhaust valve to damp its oscillation(!)), Honda gave up, took the bike back, and delivered a brand new 1,000cc sport bike to my office. But it was an interesting technology.
Or build a ‘liquid piston’ type engine
Out of context. What are you replying to?
The _braap_ is back! *:D*
That's a 13B-REW model, peripheral exhaust ports (and that intake manifold is instantly recognizable). VERY COOL, AND I WANT ONE!
A few tuners have experimented with SPCCI.
The rotary naturally has a rich mixture at the trailing rotor-tip. At a stoichiometric ratio you get a really rich mixture right at the rotor tip that doesn't burn - but either carbons up, or finds its way out through the exhaust ports.
Normally the leading plug fires first - with the trailing plug trying to ignite the rich mixture at the rotor tip to clean up emissions
What a few people did was lean the mix out at cruise to the point where this rotor-tip mixture enrichened to stoichiometric, so it could be ignited by the trailing plug. The expanding flame front, compresses the lean mixture which can then be ignited by the leading plug. I think it was called Negative-Split timing.
The risk being of course, a turbocharged engine with a lean mixture will detonate hard if not carefully monitored. It could be done on the RX7 by a good tuner with a good ECU,
The RX8 seems to do it at idle. But it's ECU is too smart to be fooled into doing it for more than a few minutes - it self corrects back to a safe trim.
One wonders if skyactive-X didn't come in some way from the rotary side - the effect has been known by tuners for a while. It'd be strange for Mazda not to know about it. Which does show some of the benefits of blue-sky engineering - you get a lot of knockons that might actually be useful elsewhere.
Huuuuu!!! All aboard of new rotary hype train!
Couldn’t you get close to the same efficiency with a turbo and a smaller displacement with the rotary?
The 13B is already a 1.3L twin turbo engine, what should they do, 800cc quad turbo?
Christ chris 600cc single turbo
i think u mean 1.3l ;);)
No, down-sizing and down-speeding to improve efficiency is a fallacy. Hence why Mazda probably refuses to go along with this trend, while other manufacturers are struggling to meet emission standards and even have to resort to cheating.
I believe the main reason why many manufacturers still opt for this strategy is because of public demand due to the heavy taxation on engine displacement in most countries.
No the rotary does it better
57 seconds in, subscriber, and mind blown. I’ve always wondered what would happen if the rotary ever received the attention and a skyactive one slay. Serious question though, how? How can anyone compete with you channel?! If what I’m workin on will make the impact that I want it to, you can burn the first set of tires down to the stock rims and keep going if we get the chance. It’d be beyond worth it🤟🏻
Jason pleaseeeee explain HALDEX not just the rear diff but also the gearbox and the maxium possible torque split.
what about a rotary that runs on diesel?
Elias Verstappe Rolls Royce has a diesel rotary
LabmonkeyG Oh yes true! But that was a long time ago right? I think engeneering has evolved a ton since then hasnt it?
Elias Verstappe Yep
Diesel has oil in it >:(
TheJeremy5599 that would be beneficial because rotary’s die because of poor oiling
I do hope they're really continuing rotary development and put out something based on the RX Vision. That thing was sexy.
Dk the rotary, it would be great fur smaller chassis.
But I am totally excited for the dual opposed cylinders, with the variable compression ratios, and the sky active treatments
Just 14 sec longer for that $$monetize ;) ;) ;)
Haha, but I only needed 9:46! ;)
As a Mazda tech at Tyrone Square Mazda I can assure you that these engines have a LONG way to go. They make great boat anchors.
You forgot to mention that you are the " jiffy lube" guy at the dealer
By Mazda tech I mean the guy, me, that doesn't torque lug nuts, strips oil pan threads, changes your radio stations, lifts your car by the floor pan, and all around damages and destroys the illiterate customer's car since they settled for mediocrity as a way of life.
@McLarenBMW like any real mechanic
Man you explain it really well,. Thank you
Excellent extrapolation. Thank you!
Who cares about efficiency. All that matters for 99% of rotary owners is can it be pulled out and ported well enough to flow good amounts of air so we can pump in more fuel make more noise and make lots of power.
Everyone does, especially car enthusiasts for one reason many seem to not consider, economy of scale. Most people consider MPG a high priority in car purchasing, if you can't sell to those people that makes the car end up being a low production count product, low production count increases the cost of each unit built which reduces sales and eventually... becomes unprofitable to make the car at all and then you have nothing.
The government does 😂
This rotary enthusiast cares because the lack of market viability has skyrocketed replacement parts cost.
Economy of scale is why everyone is doing LS swaps, if you want to have wide aftermarket support at a reasonable price you need the engine to be common and in order to be common it needs to efficient in relation to equivalent options.
@@jaydunbar7538 also helps that the LS is just a very good platform. Right out of the box you've got a powerful, and pretty damn compact motor.
Firrrsss... err. 21st. :o/
Close enough! 🤷♂️
Now I’m hyped for the RX-9. Epic video and rotary toy model xd
Had a Mazda RX-2 in the early 70s. Car was about the size of most small imports and it would leave many V8 cars in the dust. One guy had to race his Mustang several times to try to save his ego. The engines started showing up in quarter midget race cars, and won so many races they were banned from racing. They had serious seal problems and were pretty much worn out by 25,000 miles. I sold mine before it took a dump, but it was one of the car engines I will never forget. They (to my disappointment ) started reducing the horsepower to try to keep them alive. That tiny RX-2 made more power than most cars produced at the time. Perhaps, as much as 250 horsepower.
Good luck with those apex seals at 16:1 compression ratio. Mazda should move its resources to electric motors. It's the future. They are lagging.
I bet you’re fun at parties
I farted
congrats
hope theres a sign on pants ,otherwise it doesnt count
ArTiD2 lol
I am loving all these rotary videos!
SPCCI reminds me of the CVCC system Honda used in the 70's, where they used a pre-combustion chamber around the spark plugs to ignite a rich mixture, and the flame front would propogate through vent holes to the main combustion chamber to ignite the lean mixture. That was implemented with a 3 barrel carburetor: the auxiliary barrel was tuned rich and fed the pre-combustion chamber, and the primary and secondary barrels were tuned lean and fed the main combustion chamber. It also had 3 valves per cylinder: a tiny auxiliary intake valve for the pre-chamber, and the primary intake and exhaust valves in the main chamber. Now that I think about it more, I'm not sure if it was simply a flame front propagation from the pre-chamber to the main chamber, or if the main chamber was compression ignited by the pre-chamber?
@ kayacan, duration of gasoline combustion in a piston engine can be and is formulated to
take place in as short a time as possible. Down ward motion from TDC with the con rod
already off set to the crank. But a rotary at max compression the force of combustion to
almost directly against the eccentric shaft. A longer combustion time of the gasoline
delays the force to match the rotational movement of the rotor. I have developed a modifier
to achive this, and the result is more low end torque. In a carb rotary the idle rpm's are
immediately raised by 1000 to 1200 rpms. Requiring a almost complete closeure of the
idle mix screw to achive a 900~1000 rpm idle. This is the result of the rotors being
sujected to a better combustion vector force . On FI engines the first start up
results in high rpms but is manafed by the ecu to a low level, but also
shows much improved torque and less loss of rpm between shifts.
Excellent! Easily the best explanation of a Rotary engine I've ever seen. IMO, Mazda is the single most under-appreciated car company currently in existence.
Mazda doesn't make Wankel engines anymore...
@@sandervanderkammen9230
Irrelevant
@@michaellorenson2997 True, Mazda is irrelevant now.
@@sandervanderkammen9230
You obviously didn't actually watch this video about how Mazda, the only company to ever put rotary engines in production cars, is considering using the technology as part of their SkyActiv efficiency program.
Or, you are just trolling the internet looking for a fight. Either way, you are a MORON.
@@michaellorenson2997 Mazda wasn't the only company to use the WANKEL engine in a production car, nor were they the first.
The Wankel engine is an obsolete technology that is not longer used in any series mass production applications.
The Wankel engine cannot be adapted to use Skyactiv technology because it lacks variable valve timing and cannot support the required static compression ratios.
Are you just speculating wildly or are you really that unfamiliar with the Wankel engine?
I would pay so much for that little model! Would be so perfect to see it running on my shelf beside my fc!
Never clicked on a video so fast!! Rx9 can't wait!
What RX9?
I swear everyone walking into a Mazda boardroom meeting must take a large hit of crack! Their ideas are so mad. Love it
Mazda, like many other manufacturers received help from me. I used to be A freelance designer. I have retired from that kind of work since.
I do have A prototype that reduces knock. It allows me to advance the ignition timing on my test vehicle by quite A bit, which increases efficiency and performance.
Also giving away instructions on how to modify lawnmowers and generators on my TH-cam page.
I've been waiting for a MRX-5/8 Miata for years. A 3 rotor SkyActiv-X would be awesome! ミアタ ロタリ!!
Jason, could you do videos on diesel engines, particularly the old 2-strokes? Love your channel man!
Good idea! And maybe even opposed piston 2-strokes (e.g. TS3, Deltic).
You do a lot of really great videos. This is no exception. Maybe I am wrong here but I was always taught that leaner mixtures run hotter and in a richer mixture it is the fuel that helps with cooling. I believe in this video you talked about the leaner mixture producing cooler temperatures?
That only applies to homogeneous charge mode combustion...
Stratified Charge Mode combustion is exactly the opposite.
Thank you so much, so cool, subscribed 👍
Now don't get me wrong. I love ROTARY! I'm planning on building a 20B in the near future if circumstances permit.
2 problems with the rotary engine that is causing fuel inefficiency...:
1. Ignition of fuel takes place directly opposite the crank.
2. Compression leakage through spark plug hole at the apex of the rotor before and after ignition/combustion. (Think of trying to stop the gas leaking from your coke bottle with a match stick)
Mazda has yet to:
1. Move the combustion chamber closer to the apex of the rotor,
2. Move the spark plugs higher to the same degree
(1 and 2 will cause ignition of fuel in the direction of rotor spin.)
3. Design a spark plug that fills the spark plug hole and only leaves a 3 - 3,5 mm slit for the actual spark required for ignition.
(3 Will limit compression/combustion leakage through the spark plug hole.)
Someone with engineering interest will know what I'm talking about.
Outstanding..you never disappoint ....got it except for the pressure sensor concept, has ignition already taken place, what parameters would be adjusted from the sensors data ?
You will change the timing for the next combustion cycle, based on what you learned about the previous one (which you cannot change, of course).
After renting a Mazda 3 hatch with skyactive engine was fun when I hit the sport mode switch
Thank you for giving us a hope.