High Velocity Porting - Part 4
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- เผยแพร่เมื่อ 14 ต.ค. 2024
- Looking more into this port flow malarkie....
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Love it when somebody has their shit together, and drinks red bull whilst smoking. My kind of chap. Subscribed 👌👌
if you dont have time, dont might me but if you do, i really love to see your port solidwork flow sim tutorials videos
Love the northern Territory sticker on the white board hahaha
Looks like as the flow slams against the closed valve it can stack up in the large area and not back up all the way to the intake area keeping the port entrance air moving forward.
Soon as you said that I subscribed jajajaaj
Nice firings on ur cigar....
Me from India converted a street bike to dirt by increasing compression ratio and it has 70mm bore and 56mm stroke
stock cam of 5mm lift
2 inlet valves -22mm
2exhaust valves-18mm
I can’t increase the valve dia because of less centre distance.
How can I increase the power pls suggest my friend
I had a 1986 700 cc Yamaha Fazer with 5 valves. Its cylinders are tilted forward, around 70° and it has a vertical intake so the gas tank area is the air box.
Talking about flow, how would you port match your intake rubbers to your head? Is there a way to do it properly?
Cheers.
Because like he said in the video...it opens up to allow more air in, without port match your port is almost useless. Wouldn't make sense for the beginning hole to be smaller than the inside.... I think port matching is very important, but then again depending on the engine it might be ok not too...lots of variables...study your engine like it's your soul.
What is the make of the engine being talked about here?
Yup your dead on, when I made the very entrance of my intake 3.5" down to a 3.0" I gained power, im going to experiment and dimple port literally the whole intake, intake manifold, and the head...keeping it equal but a better velocity.
I absolutely love it when he gives objects human emotions and shit... It's beautiful xD generally makes me laugh 100% of the time 60% of the time...
Good subject. Velocity converts to pressure in the low velocity bowl area. When the valve opens it releases pressure into the cylinder. I learned this studying turbo compressors. Velocity to pressure conversion in the volute. It seems like the same thing. Harmonic pressure waves there as well third harmonic. Up the Irons!
This is exactly one way you get > 100% volumetric efficiency. Unfortunately this TH-camr doesn't believe in fluid dynamics 🤦♂️
boost bottles, intake resonance, acoustics tuning, call it what ever seem to add power how does this fit with your port velocity / runner length
I've got this slight suspicion that matt might have an affinity for kawasaki, dunno though, cant find anything hinting towards that.
Yea, Matt's position with regards to Kawasaki is unclear at best. I'm sure when he's ready he will share his feelings on the topic.
@@nightster6378 i think you missed the joke
Maybe hes looking for a new sponsors Kawasaki and Camel come to mind . All he needs now if a flat cap, a whippet and a Northern accent :D
@@nightster6378 oh sorry then, normaly i read the comments but havent seen the PGMV8 videos yet so id have missed it.
@@nightster6378 Too many Plums in his mouth :D
Hi matt, off topic question, do you think it would be possible to use 3d printing to create engine case moulds for investment casting?
Cheers!
For the moulds? Do you mean the form/plug?
@@dirtygarageguy I mean to create replica engine components using a 3 d printer, set them in plaster then melt away the plastic part during the kiln drying process leaving me with a mould to pour aluminium.
If possible it would allow repeatable consistent castings which I could then machine,
For the purposes of recreating classical engines.
You missed a crucial point Matt. The main reason why the port increases in diameter towards the valve is because the valve itself takes up space in the port. So of course the overall diameter of the port needs to be larger towards the end there. The restriction in airflow, caused by the valve stem, guide and guide-boss; (part of head casting which protrudes into the port), needs to be made up for by increasing _overall_ port diameter. There isn't really much _net_ increase in port cross-sectional-area downstream of valve stem.
This was subtracted from the area measurements - I said that in the video......
@@dirtygarageguy The main reason for the progressive port enlargement is to make up for the flow restriction caused mainly by turbulence (from stem, guide and boss). The fact that the inlet charge slows down as it approaches the valve head, is more of a _secondary_ affect, of this necessary port enlargement, wouldn't you say?
how about carburetor engines that relies on fluid velocity at the carburetor.. what do you recommend at porting ?
The same thing applies
3 quick points, 1) manufacturer's pay millions in salaries to engineers to get the most out of an engine designs, Joe smucka-telly from backwoods wherever isn't smarter, 2) squeezing the port down is making the air do work which is increasing temp which is counter productive, 3) when my wife and I use to motocross back in the day adding 2 teeth to the rear sprocket ALWAYS livened up the engine. Cheers Matt
If point 1.) were even remotely accurate a modified production port (or any part ) would never perform any better than the factory piece. Back when NASCAR mandated production castings the engines made over twice the HP as the factory engines. I’m not a Ford man but Bob Glidden was offered one million dollars by Ford to let Ford engineers tear apart his engine. Bob Glidden wasn’t an engineer. He was just smarter than all the Ford engineers.
The only time I've seen port stuffers work is where the port entry is too large in relation to the choke. Opening the choke gives a good improvement but with some heads, when you open the choke too far it can give too sharp a radius on the short side, causing flow separation. Stuffing the port upstream of the choke can allow you to open the choke point up more and have a longer radius on the short side giving improved flow. Having done this, the port cc is smaller than before but the MINIMUM CROSS SECTION is LARGER, the opposite of dickheads stuffing a fairly well designed/developed port like you'd find on a modern motorcycle.
Honda manufactured ADV 150 motorcycle 2 valve per cylinder in 2021. What is your opinion about that?
Opinion? It's a 150. It's cheap. Honda also make a 125 with 4 valves, but it's expensive...
Redbull and weed.. an engineers magic cocktail
The circumference of the open valve is called the "curtain area"
It is in America! Fuck Yeah!
@@dirtygarageguy Now you're getting it Matt! :D
Also known as "combined valve area"?.... aka "inclusive valve area"?... aka "3 dimensional valve area"?
Removing the snorkel on the airbox seems to be a popular mod but I've always thought it does nothing but let rain in your airbox. Any thoughts on this? (This video reminded me of that)
Have snorkel removed on my dirt bike, but the hole it makes is up under the seat, seemingly not a big risk. It does make a difference as evidenced by needing to adjust the carb, 3x3 mod they call it.
Don't mean to hijack comment but a related thing a tuner told me when I was looking to get more out of a fzs1000. He said *don't* start cutting up the airbox, every R1 that comes in with airbox mods has a lot of work reversing it to get the low end back.
So different bikes different conventional wisdom, definitely be interested to know more.
According my calculation the intake valves have a 40 mm diameter. What diameter have the exhaust valves?
Matt, another great video! But please quit promising us videos you don’t have time to make. All these videos you’ve promised....
Love you man. Keep them coming. 👍🏼
Good info. Cheers
Bike :religion
Tuning:spiritual
This : comparative esoteric theology
Amen🔥
i don't understand why i don't see more 4-valve Counter Swirl, ( come in between the two more, and use the velocity to get between the seats and valves by transforming the velocity into centrifugal pressure )
There are many systems that try to offer a dynamic solution to this. Honda VTEC has different lift levels on the cams, BMW Valvetronic didn't have a throttle plate and instead used infinitely variable valve lift. IIRC the VFR800 had VTEC and everyone hated it yet it optimised engine efficiency over 2 rpm points instead of the one.
I did picture myself being an air molecule and going 'Oh fuck' as I smashed into the valve though :D
How about adding dimples till the cut throw ?
Only in some areas.
@@VndNvwYvvSvv dimple not work? Sure?
U remind me what I use to do in my apprenticeship 1979 to 1983 Alfa's and using a rolling road hehehehe memories
Gearboxes, diffs, engines, brakes everything
Sweet
Bernoulli was a SON OF A BITCH!
He could have made that shit simple, but instead, said fuck it lets make it ridiculous!
[sarcasm] Maybe they should fit barrel rifling grooves to the carb end of the inlet as that seems to be a good way to add turbulence [\sarcasm]
But then it'd be illegal in the UK...
[/sarcasm]
@@novaprospekt1739 Only if it was a loaded bike :D
How about the ports on an old Harley Davidson Sportster ironhead? Huge holes with a sharp 90 degree right before the valve. Old race team drawings show them raising the floor just before the bend and widening the port at the same section. When you call the port design absolute fucking rubbish you must have envisioned those. Love your channel, subbed.
Solve Bernoulli's law like I did in my video about how cylinder heads work. People will accept that shit!
-- State 2 requires the air to be less dense on the other side of the port.
--I ever so slightly protest your suggestion of pressure at the back of the valves. A large flow volume is broken into two smaller ones with more drag area, in which flow separation would be a thing to think about. In overlap, with the right timing and resonance, and valve reliefs, Yes, that'll scavenge like fuck.
-- But crashing into the backs of the valves, maybe not all the time. The YZ450F has a nice cutaway. The port seems to be aimed into the open area of the valves. By that, the pair of valves will act like a big valve with one side shaped like a butt-crack, and the other side gets ignored because the port is kinda aimed to not go there.
in fact i have never seen that...i am the only one i know that ports in counter-swirl. ( one intake swirls C.W. and the other spins C.C.W ) with the main port section focusing toward the bridge...it's the same thought process as 2-valve swirl porting, just mirrored..( professional porter style swirl ports, not the screw ball idiots that use large taps to wreck their ports )...it ends up being both additive and subtractive on most ports...just a little epoxy work on the outsides, just a touch ahead of the "classic stem area min. port c/s", with a sharp juncture between the bowl and that side of the port , ( looking for higher flow bench flow at lift mean, like rms )..porting is difficult to explain with words, and learning swirl porting is best on a 2-valve head first.....in 4-valve counter swirl then; your increasing the bowls toward the bridge, so the bridge shrinks back..basically.
this programm?? can you send me please? 1:10 ......????
the head pictured looks like it's off a ltz 400, basically the same as a drz400 and it's a known fact that these heads are restrictive in stock form, i own an 04 ltz 400 since 2011 and did some mild porting to intake,exhaust and chamber "clean up" with good results from mid -top and no loss of torque at bottom, i actually had to go up1 on the counter and 2 down at the axle to keep the front end down. I think the people that are doing this port velocity crap are bassackwards lol.
I believe the problem is the ports are 'shrouded' with the cylinder. At least that's the forum wisdom about why 440 kits make such a difference on those engines.
@@ooohry well when you increase cylinder displacement "larger bore", yes it helps. but mine is stock bore, and it worked.
Dude, how prolific can one man be ?
You sling more videos in a day than a lot of lads do in a week or more !
It's all that red bull ... you're like peter griffin ffs
th-cam.com/video/Cqd-_fHdTyA/w-d-xo.html
This is what I think of when I think of him.
Can i borrow you a cigarrete?
perfect example of 4v vs 5v heads -
for the 07 model year r1 yamaha went back to 4 valve heads. cylinder bore size stayed the same.
3 x 23.6mm vs 2 x 31mm intake valves - guess which setup has more valve area? (or just do the maths lol)
sure the 5v head looks nice on the bench but nobody cares about the way it looks when they're being passed down the back straight
The issue with 3 intake valves is cost. The 3 intake valve head is better, but the difference was not that much better than the 2 valve set-up, but the cost was quite a lot.
Bloody brilliant
Thank God. Someone else puts it bluntly.
If you want low end torque, change gear. Don't be lazy.
i stop at 8min to say, ive seen serious result dynoed about raised intake ports on injection quad or bkes cylinder head.
the goal is straightening air at valve entry, get higher OBLIGATED( hope you kno wrench now) ar speed by restrained volume. So all that is applyable to an angine who lacks of air speed entry, and valve/piston to cylinder air flow, that is important.
butbapart that im following you, and i add that if we have to do theses mods to a cylinder head, its shit. And doing plastic mod to a culylinder heas instead of playing with surfaces flowing carracteristics is an error
those guys need a lesson on static vs dynamic air pressure. INSIDE the cylinder, you want ALL the dynamic pressure to turn into static pressure, not before the valve.
What is your career? Mechanical Engineering?
No he's a gigolo at local old folks homes, he spends a lot of time servicing 'things', but its not bikes...
@@beachboardfan9544 Casete
@Osvaldo Mena I like dvd's better...?
@@beachboardfan9544 You didn't understand
@Osvaldo Mena 📼 casete?
How about Dimple port??
Don't work
@@dirtygarageguy are u sure dimple it's not work in engine? Can u talk about dimple not work in engine? I'm form Indonesia sorry my English not good hehe cheers
Any engine from v 12s down I could tune by ear only hehehehe Weber carbs su carbs delotors? Spelling Solex carbs Strormberg? Spelling
hahahaha i lost it at kawasaki hahahahahahahah🤣
Put a rifling twist in it control the air ??????
You'd fling the fuel out (even though that's not technically correct cos centrifugal force doesn't exist). Rifling is used for gyroscopic stability and what we want is uniform distribution.
It should make the air get around the valve easier if it has centrifugal force, might be a good use of the overly large diameter there usually is right before the valve
Hypersonik if we increased the air distribution (pressure or flow) at the perimeter of the valve seat rather than at the stem, then shouldnt that be helpful
@@ghettobikelife8833 The valve is doing the job of distributing the air and the angle will have been designed in conjunction with the cylinder itself along with the cam timing profile, stroke and everything else. You don't want the fuel 'pooling' or separating form the air otherwise we'll get a shitty power stroke. This is why you'll see certain bike engines with two sets of injectors - one set at the port the other above the trumpets.
Shouldn’t you be drinking Jack Daniel’s #7?
I thought you were quoting the smoking and Red Bulls? WTF man? Let’s have you stick around a few days longer.
👁️♥️👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍
I think where ppl are thinking it’s a smaller flow it compresses the air as well , I’m not saying this but there must be an explanation for what there say ..... if you know what I mean 😬
Causing a flow restriction does indeed cause a local compression - but that compressed region push es in all directions - including again the flow - this is what actually causes the choke point
Weber carbs I use to build from scratch
Is "Fucking" a technical term ? After the fourth one i left
Can u chemically break down fuel to its chemical components??? Difference between 1980s to today's fuel???
You would have to heat the fuel and use there respective vapor temperatures to capture each component, but I think so yes.
@@dirtygarageguy ok slow motion camera to capture fuel burning look at colours = chemicals burning temps. What the diff get it tested ??? Ask Ur followers. knowledge. I am old hehehehehe
@@dirtygarageguy i think there are several analytical approaches for fuel analysis e.g. gas chromatography, mass spectrometry or even infrared spectroscopy
I thought moto man went ages ago I was dubious about it myself
porting/tuning on bike engine and car engine that's totally different...
How? Do car emgimes run of different air or something?
The biggest restriction in ANY cylinder head is the valve
If you think modern american V8s are shite you need to take another look. LT engines and the 5.0 coyote are awesome.
LT4 Tech Specs
6.2 litre
Cam in block
Pushrods
2 valves per cylinder
640HP from 6.2 litres = That's 103HP per litre and its supercharged! LMAO - don't make me fucking laugh.
The Z900 I have, which is NA and not a 'fast' bike makes 120HP from 950cc Thats 126HP per litre. You have to be shitting me?
Yes they are shit, and still shit.
Forgot the link - information from chevrolet themselves here - www.chevrolet.com/performance/crate-engines/lt4-wet-sump
Thats in a zl1. Lt4 in the zr1 is 755 but thats k. Regardless thats on a factory tune. Easily pulley swap and tune for another 200 hp.
Im not arguing that a bike engine isnt good. I ride an r1, i love my bike engines. But im also a v8 fan. Hell you can FI a coyote and make 900whp without changing so much as a valve spring. And daily drive it. But there is more too it than peak hp on a restricted factory tune.
but we're talking out of the box. The V8s are designed to be cheap hence shite. 650HP + a supercharger from 6.2 litre is poor, really poor. Take the R1 - 190HP from 1 litre, without forced induction.
Sry it's the engine breathing the easyer it breaths the better?????
Kwak,Kwak,Kwak,Kwak,Kwak,Kwak,Kwak,Kwak,..........
I am wofferling hehehehe
Sometimes realty with theory not same, hehe sure?
Sorry, what?
@@dirtygarageguy how about dimple?
Aero plane wing
Verniers my dear fellow not callipers.
Der ye naw how many knottins a got it fa not sayin “verniers”
Wey howay man yer educated.
😉
😂😂🤣🤣🤣 fuck me a Kawasaki ninja power ranger. I fuck spat me coffee out. 😂😂🤣🤣
1
Part 4 and still being stubborn and wrong.
Remember, kiddos, this guy apparently doesn't even believe in Bernoulli's and Venturi's work, let alone > 100% VE. PLEASE, stop pretending you know fluid dynamics, engineering, and engine building. 🤦♂️
LOL twat
Iam 56 don't use sat navs don't use my phone to travel just get lost hehehehehe bike only
You computer animations are laughable, one shows you broke the speed of sound lol, after that you show the most ridiculous high velocity port I have ever seen and the pressure gradients are completely fake, the next has air turning the short side radius like its a straight port.