The Most Powerful Two Stroke Ever - How I'll do it.
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- เผยแพร่เมื่อ 13 ต.ค. 2018
- My recipe for the most powerful two stroke relative to cc ever.
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Don't worry about the commenters carrying on about your clothes. There are an amount of people that just feel they have to say something to be noticed or sound superior and I believe a lot of it comes because they do not understand the topic coverd or have anything useful and productive to add.
The amount of whining I get over not wearing gloves or other safety crap is unreal and shows how many people think stating the obvious makes them sound clever. same with people crapping on about environmental issues. Wouldnt have a clue in reality but say what they have heard before so they fell like they will be gaining social acceptance.
Love your ideas with the engine. When I first came across you channel a few vids back and you explained your Idea, I thought to myself, this guy is going to come up with something really revoloutionary that will leave all the mainstream manufacturers for dead. I believe that even more now. you have the right personality in my opinion. reserved, thoughtful and calm. I also think you will be honest and truthful in what ever you achieve. You obviously have the knowledge and intelligence so I think you will come up with something good.
I can see a new engine named after you which will be the cutting edge design all others follow.
Thanks for the kind words!
Its called trolling and its fun...you should try it sometime :))
I just haven't figured out the half sideways hat thing. I'm not calling you out, because it's a trend, but seriously what is the point?
In my case there's a simple explanation - I like flat brim hats but my head is too oval shaped for them to fit straight.
@@2STROKESTUFFING i love the dyno vids of the 50cc !
You should get a medal for this. It HORRIFIES me that Two Stroke engines seem to be disapearing ! Keep up the good work.
wtf people whining about clothes in a two stroke motors channel... like this is a damn fashion channel
Still better than people dressed in Gucci/ Supreme and Louis Vuitton.
He doesnt look like a walking advertisment :)
He dresses like me so im offended aswell
Hi I agree I need some subscribers
@Sma 556 lol
He does kinda look like a kid
This is the reason that i try to help you out on patreon! It's amazing how guys like you are so into things that thry try to mix different, not so well known technologies into old ones and try to make the ideal "version" of an old technology! Love your content and keep on doing this amazing content!
Thanks, and thanks for the support!
Excited for this video, as always. Keep up the good work!
Thanks!
@@2STROKESTUFFING kókókkk9k
I've never seen anyone that knows 2 stroke engines better than yourself. Brilliant!
Heck yeah! Keep the 2 stroke innovations coming! It's all about trial and error and learning from what works and what doesn't. Keep on keeping on! Thanks for sharing your passion.
Thanks, I agree!
My first vehicle was a 2 stroke and I modified that as many ways as I could to the point of it running on alcohol at the end. I miss that smell! Love it when people push the boundaries! I wish you all the luck and positive vibes in making a awesome setup! Love guys who aren't afraid to push the envelope and try things that haven't been done. All it takes is one motivated person with a good idea to change how a certain thing is done. Looking forward to watching it all come together for you!
Thanks man!
Love see someone working with passion on two strokes 😉
Bought one of those angle meters last month, same as that but silver.
Got it for my mill but also used it to check the angles on my ski edges.
You should not have edges on your skis ;)
I think they call that a snow board.
Cool! Usefull tool!
I had an idea bouncing around for a few years that is a variation of your second piston exhaust valve. If Mr. Koenigsegg would part with a component or two from his FreeValve system you may be able to achieve exhaust control without the mechanical additions. Another thought was to make your own sound wave to compliment the expansion chamber's return wave. Material science has come up with some interesting high heat resistant solutions for industry. I'm sorry I haven't researched beyond cranking up a stereo and feeling the volume blow by. One last thought in support of an actual piston, I'd clocked 90° from where you showed it there's potential to stuff the charge back where it belongs. That whole thinking thing can sure become a bit crazy with small engines, wild prototypes can usually be affordable and very interesting. Nice to see you have a plan. Take care, cheers.
Can't wait to see this project develop!
I started this series once again from the beginning. No Netflix needed for me :) thank you!
Awesome. Can't wait to watch the masterpiece take shape!
Thanks!
I have seen engines before using rotating sleeves ...
Cant wait for this project to take shape...
👌👍
I'm very excited to see plan B , it was something I thought of a long time ago but did not have the means to test, good luck with it I cant wait to see the results of your new designs
Thanks!
Sounds like this is going to be awesome! Probably goes without saying but I'm happy to help out with whatever I can.
People actually complained about what you wear?? Wth is wrong with it, and even if there was something wrong with it why would they care, it's not like you're running a fashion channel here.. I just turned 40 and if most of my clothes that I've had since the mid 90s hadn't fallen apart over the years I'd be dressing exactly like that :) I hate buying new clothes because they're all so tight these days, even the so called loose fit ones make me feel like I'm wearing a straight jacket and yoga pants and I have to fold my feet to get into them in the first place. Tight clothes are the worst, just can't get comfortable in them. Back then they knew how to size clothes! In the garage I usually have my sweatpants and lumber shirt combo nowadays to save what little proper clothes I have left from back then ;)
Just amazes me with all this man has to offer with his insights that anyone would even notice what he wears. I was laughing listening to him thinking anyone would be so petty and missing what the man has to offer the only thing they can think about is his clothes? Geez there are some Clowns out there. Maybe he should wear a 3 Pice suit while working on engines and doing things in the garage? I mean that would be so much more appropriate wouldn't it? Idiots.
Thanks! Totally agree, everything is just varying degrees of "skinny fit". I wear all my stuff completely out, then buy in bulk to get it over with. About 4 years since last time...
Thanks! People are strange...
You sound like me. I'd go shopping and buy a pair of pants... 2 pair in black, 2 pair in gray, 2 pair in navy or whatever they had. Jeans, try them on, find the right size, 6 pairs as I wear them a lot. Same for Shoes, find some that are comfy and buy a couple of pair in each color. 4 pair of sandshoes. Shirts etc. Stack of Socks, jocks and variety of T shirts, and a new suit. Done! And I could be in an out the shopping centre in under an hour with a couple of years worth of clothes at least.
Then I got married. Haven't bought myself a stitch of clothing in 20 years but I have enough for 10 men. The Mrs constantly harps I have too many clothes and to throw some out. I say yeah, I got to stop going to the shops and buying them all the time and wasting money because I have so many I can't fit them in the wardrobe!
For some inexplicable reason she gets annoyed at me for saying that! Still comes home with more clothes for me every month though!
If She bought nothing ever again and neither did I other than Socks and Jocks, I could live to 150 years old and still not run out of things to wear!
Great videos bro! I learn alot. Thanks for posting. It's great to see hands on videos. Very informative.
Thanks!
Great video, not an engineer but understood everything you talked about. Can't wait to see things get going
Thanks! I'm no engineer either...
I remember first watching this video, now look where we ended up. Awesome!
I never heard of clothes making a good mechanic😂😂😂😂
Hahaha so true! If it's not a safety concern then it's no concern at all.
Good on you for standing up for yourself! No idea why they are complaining
Gleder meg til å se hva det blir utav dette prosjektet :)
Og fortsett å vær orginal, vi trenger flere orginale mennesker her i Norge !
Takker!
Really interesting and very cool. Your thought process is remarkable. Hoping for your sucess.
Thanks man!
Love the ideas! Looking forward to the progress.
Thanks!
This is awesome, I miss my Yamaha YZ125 i liked working on that 2 stroke engine. Verry cool you are building your own, i will sure follow this from now on.
Thanks!
you make my day better. your videos are awesome.
Thanks man!
this is amazing. you will revolutionise Two strokes !
Thanks!
Keep up the good work man! Love to see some good 2 stroke tuning, make's me want to buy a 2 stroke again just to fiddle with in garage! Greetings from neighbour Finland! :) Going to support you on pateron next salary payday!
Thanks man!
Your sir are a very dedicated 2 stroke person when it comes to power output.
Great site and the passion for continuous improvement. A true open minded engineer.
Is he an engineer? Where did he study?
Like the exhaust valve idea. Large diesel engines use poppet valves in the head. Makes it possible to flow bottom-up. They use turbos, not crank, to get the air flowing through the cylinder.
Tru but the used supercharcing for drive out the exaustgasses and filling the cilinder with frech air
Old 2 stroke detroit diesels used a supercharger like device to scavenge the charge instead of the crank case.
Can't wait to see the results of this! Sounds like a awesome project and hopefully will revolutionize two strokes (see what I did there :)
Thanks 😁
NGK offers 8mm. plugs. Make your new pipes a slip fit over the headers so you have adjustability of tuned length. Cut the headers back as you adjust, so there is no excess header inside the divergent cone. Start long and adjust shorter .250" at a time as the RPM increases. You'll know when it's too short, because the engine will struggle to accelerate on load. Good luck.
Cool, and thanks for the tip!
I'm even learning down here in the comments! Thanks
The front of the pipe needs a short straight section that can be slotted. The header slides inside ( slip fit ) and a heavy duty hydraulic gear clamp seals it. The ID of the header should have a gradual taper on the end to aid smooth flow inside the pipe.
"be open-minded for other peoples ideas" important ingredient in the recipe for success!
Love your videos, Always very informative
Thanks!
Great video keep up the good work
Veldig informative videoer!!! Keep it up
Takker!
Interesting thanks, MY 1976 CZ 400 Faulta reolica had a Toriodal combustion chamber I had ported that thing and added a reed valve it had a bridged exhaust port I had widened 15%.. it ran good for a 40 minute moto but would eat a piston after about 6 40 minute moto
I had kinda the same idea about you plan B but with a rotating disc valve. Would love to see if this works
Always look forward to your videos, and new ideas. Have you ever done any of this type of engineering on larger 2 stroke motorcycle engines. I have a few vintage enduro racing karts from the sixties and would like to do experimental high speed tuning. If your interested watch some enduro kart racing on full size race track going over 120+ mph.Thank you for reading this.
Thanks! Never done much but repairs on larger stuff, but most mods are scalable for any capacity.
I remember my grandfather telling me he was amazed when Tomos made an 18hp 50cc with regular 2stroke mix. Im keeping my fingers crossed that this project works.
👍 I
Its still a VERY respectable number id say 😁
It is! I've managed 17.8rwhp so far on gas.
@tormen Im talking about the Tomos GP. There's a Slovenian documentary that mentions 18hp at 50cc actually.
This is getting good!
Thanks!
Hey, interesting ideas right there. If you need 3D printing help or parts, feel free to ask.
I was the guy who 3D printed the simple carburetor (and I did an intake pipe to connect a bike carb to an engine block with a heat resistant material:) .
Thanks for the offer! I remember that carb!
wow.. its better than chinese carb ?
@@coron1985 nop, the Chinese carbs are pretty good all in all. They are very similar to the original ones.
Sounds like. A recipe for turbo? Timing all ports working together. And not against the flow, will be tricky. Perhaps 2 exhaust with proper timing. The secondary exhaust would act like a blow off and operate on crank case pressure if needed. Love what yer doing. Cant wait to see.
2STROKE STUFFING CNC BILLET the whole thing.
Or prepare for failurez
Look into the Homelite chainsaw motor. It has a 90°piston as the piston pin is inline with the exhaust. Sounds like similar to what your doing. Cheers
You're crazy!, Keep it up !, I love your videos!
Thanks!
had a ported 1979 husky wr 390 was amazing wheely every gear down the beach had teflon treating as well...
Great! Excited about plan B!
Thanks!
Gonna be awesome man
Your clothes looks comfortable and good quality. I also like the colors and design. (And the fact that they don't sport a big brand stamp on them).
Keep up the nice content.
People pay entirely too much attention to things like what other people are wearing. Im always so interested in the subject matter of your videos that i dont think ive ever noticed your attire. Keep up the awesome work!
Thanks man! People are strange...
Haha I feel you with the clothes.. I’m a 85’er me too and skate 😅 Leave us alone good damnit! 😂
Your new specs on the motor seems cool 👍🏼 Good luck man!
Thanks! Gotta dress your age!
Wow looking forward to this Bro
Thanks!
Your clothes is cool man I'm 44 and dress no different to 20.
That timing meter is awesome fine tuning there. You and Mark Atkinson working together both your 2strokes engines are going to be the best ,2 years from now i recon you'll be dynoing a v twin . Not giving ideas for now just future.
Awesome stuff.
Thanks, Mark is incredibly talented!
@@2STROKESTUFFING absolutely Mark is and you both are . I've so been going through your older vids prob should leave comments on older vids but here now.
Had 2strokes all my life and raced them. In process of buying another RGV 250 so your new tec is very exciting to watch love it. Quick question what's reason for small 10mm spark plug is it because of fuel (methanol) ?
Cheers Pat.
Your clothing style is absolutely ok. No need to worry. I almost dress up same way most of the time.
I like your style bro. The haters can suck it.
Wouldn’t the toroidal head cavity hurt the proper swirl/loop of the transfer charges compared to a regular semicircular head? Maybe only a small effect
Short answer, no. With a flat top piston it behaves very much like a "bathtub" shape and domed piston - but slightly better. My drawing is a bit exaggerated.
Really enjoying the series so far. I'm also working on my own 2stroke cylinder for a moped (!?)
Thanks, awesome!
could you use exhaust valves like the old 2 stroke diesels had?
I remember in 2006 at sweden, in the classic tt race, I was checking stuff on the pit and on the market place there.
One guy selled a new 50cc Honda NS50R racing bikes cylinder.
Don’t know the stroke of that engine, but the ports were Huge and very, very high! Seller said it has 17hp out of the box.
And said that specialist carve out from that cylinder over 20hp easy. He resists to gave the portmap for me, but if I remember right it had atleast 8-transfer or so? But the sleeve was like full on holes, and had sick port areas.
Hei mate, where i can find the draw with the dimension online? Thank you, very good job. I'm also interested in making this thing on my Piaggio Ciao. I want to make it fly!
Great video good luck!
Thanks!
Please help me... What should i do to porting Block yamaha rx 132 cc?
I don’t watch your channel for fashion advice I watch to learn 😃
😁👍
There is an old guy living in my town who is working with two stroke race bikes for more then 60 years. He has over 40 bikes in his house with 3 dynos and has two Aprillia 125cc race bikes that produce 74hp at the crank after his mods! He says that the exhaust is the part that makes the most difference on Twostroke engines and i guess i can confirm that by seeing the ammount of different exhaust pipes he has made over the years ^^
Cool, I definitely agree about the pipes!
Now to the 74 crank hp. Sure you remember correctly? If that's true, and that's a BIG if, you need to get that man on here asap! Without some wild alien technology that hp figure is simply not attainable.
I will try to confirm that! But the power output before the mods was in the range of 50 hp if i remember correctly! I try to meet him as soon as possible again and try to get some info from him how he had done that. He also has 2 Suzuki RG500 Gamma with 140hp after tuning and i know that these numbers are possible with that engine.
👍 The most powerful 125cc I've ever heard of is the Aprilia RSA with 54hp at the sprocket. If he has managed to add 20hp on top of that I'm all ears!
140 at the rear wheel from an RD500, is quite achievable. Although it can reduce part lives down to a few hundred kilometers if you wish to keep on the racing upper limit, and inspection tear-downs/rebuilds to being very often if try to get much more power than that.
2STROKE STUFFING when u build ur pipes try adding a football shaped in the expansion chamber. I can give u my algorithm for the area it takes and angles. U will be shocked. I figured it out screwing around lol
Now you've uploaded your latest video I'm posting this again:
Mr 2STROKE STUFFING, I have had the good fortune to watch nearly all of your videos (bar about 20) since I am laid up with broken ribs. Half the pleasure in watching them is reading other peoples comments, and aside from that the effort you put into replying to them (no easy task). You can feel the frustration other TH-camrs feel, when things don't go right for you.
As for the editing, well, what I can say is that it's nice to hear the music fade out in this video (around about 3:35) because we can once again hear a highly tuned 2 stroke running on petrol (gasoline) - which after all, is what 99.9% of us put in our tanks and run our bikes on. You can see the thought that goes into your videos, the trudging through the snow until you finally "hit the buffers" is a great metaphor for the way you felt at the time. I also loved the bit where you're sitting there thinking and the "other you" goes and pours yourself a drink. Hahaha, clever stuff! I reckon you could turn your hand to most things, and you're a bit of a perfectionist too.
I mentioned in another video that an informative and educational video like yours, where you actually improve a moped's performance got 10k views, whilst another guy pours sand and grit into his lawnmowers oil filler (causing self-destruction) and gets 1.5 million views. This guy is making money off of TH-cam, and you Alex, on the whole are not. This is what I suggest: When you're finally happy to get back to petrol (gas) as fuel, and your set up is proven to run reliably (on the real road as well as your rolling road [dyno]), then you gather up all your homemade parts and copy them, do a deal with the manufacturers so you get a good price for a minimum order quantity on their parts, put the whole kit and caboodle in a box, then SELL it as a kit. All this hard work deserves reward mate!
Stick to the day job as long as you like - you're a kindergarten teacher, and a very good one I imagine, too. I've worked at teaching as well: British English to Spanish speakers. This is where I'd like to add one more comment - and it ain't a criticism as your English is absolutely excellent, but throughout your videos you've pronounced the word "idea" like "ID". The correct pronunciation is the same as we English speakers pronounce "Ikea" - the Swedish ready-to-assemble furniture manufacturers.
So, having added my tuppence-ha'penny worth I want you to actually read this, so I'm gonna post it again. Just as soon as the next instalment in your "2 stroke quest for the best" video comes out! I hope that when your kids grow up they share your interest, and you can spend time together imparting all your knowledge to them. (If God forbid, we're not all forced to go around riding electric bikes/scooters/mopeds!). Good luck me old china, Jonnie
New subscriber love your videos man super dope
Thanks man!
@@2STROKESTUFFING yea man I love genuine and original stuff on TH-cam plus I love bikes so you hit the trifecta where I'm concerned!
Good stuff!
Thanks!
Hey buddy a Stihl Ms193t exhaust is 90°from the intake. IDK if it is relevant to what you are doing but it may give you some ideas.
En annen ting du må tenke på når du går for 100% eksosport er rotasjonsretningen på motoren.
Hvis motoren går den samme veien som hjulene ruller framover og du har eksosporten framover er at når stempelet går oppover igjen så vil stempelstanga presse stempelet mot framdelen av sylinderveggen og det er fare for at stempelet vil butte i eksosporten.
Med sylinderen snudd 90 grader så eliminerer du det problemet
👍
This is gonna be the sickest thing ever
Thanks!
Hey ! Great video. What program will you be using to simulate the ports ? Thanks.
Thanks. Engmod2t - great software!
Hey, would it be technically possible to run a rotary exhaust valve to increase torque at low RPM ? The position of the rotary valve could change depending on RPM by using a vario like system. By doing so you could change the engines diagramme depending on RPM, in addition you could even turbo charge a two stroke ...
I suppose it would. In my plan B it's there to allow a turbo/supercharger to build pressure.
Can you not have the carb fixed to the chassis of whatever you're attaching the engine to, and a rubber hose connecting it to the inlet to counteract the vibration issues?
I'll see if I can come up with something.
Youre a badass. I support you, your clothes and cocked hat are sick. I dress similar im 29. How do i support you?
Thanks man! Patreon link in the description.
Fancy seeing you here JD..LoL
Enjoyed the video! i got my large mill up and running finally, let me know if i can help out. Hope to have a lathe soon also.
Thanks! I'll let you know!
Could you make a video with just the basics on porting please?
tell me what that head is good for I know its good at mixing but is it better at high rpm or what, and longer con rod is better at dell time at tdc and bdc so more time for pumping ,and I need to see plan b but I need plan a befor plan b you have good ideal im glad to be watching them come a live
Thanks! The toroidal head together with a flat piston top has been proven to make more power than a "bathtub" and domed piston. More turbulence, better/more even combustion.
I can do small lathe work for you! Only a small disadvantage I live in the Netherlands
You do a grate job
Thanks!
What if you make the header of the pipe thicker, so it stays more hot
I can draw up a cylinder in 3D on solidworks if you need. I can also print multiple cylinders with PLA filament on a Prusa MK3.
Thanks for the offer! Let's see how I get along with fusion first.
What is the advantage of running a smaller sized spark plug? more hemispherical shape in the small head without the plug being so large?
2 stroke stuffing love youre videos! but i have 1 question what are the blue fairngs on the spx and where can you get them? Greetings from germany.
Thanks! They're slightly modified Motorhispania RX fairings
Thanks.
You can get 1/4-32 threaded spark plugs, they're used a lot for small rc engines
Thanks for the tip!
@@2STROKESTUFFING No problem, didn't see anyone else mention it so i figured i would lol
Would you get any noticeable performance gain if your gas oil mix was changed on the fly using some sort of variable auto mixer to suite the current situation?
Edit: Like one minute you run 50:1 next minute it goes to 40:1 or 30:1 just to clarify what i mean.
Possibly also a dual charger (turbo & supercharger working side by side to push optimal power) system if that would even work well enough to get a good enough power gain.
For your plan B exhaust constriction take a look at a Suzuki lt500 engine design. Found on a 1988 Suzuki Quadzilla lt500r.
Incredibly hard pulling engine from low rpm
HEINZUNIMOG 2Vintage just bought one lol
Thanks for the tip!
Can you do a video explaining how to design an expansion pipe as far as the math behind the cones, inlet and outlet sizes and how they relate to rpm, displacement etc. I get the function but not the math on size for proper resonance.
Check out AuMechanic's channel, he has a great series about it!
I always assumed that the 50cc size is part of a regulation for motorized bicycles. If so, would Plan B violate that rule?
I'm not bound by any regulations.
Hi man! Wont the roller bearing both add mass and friction compared to a ball bearing?? I think so.. I think using c3 bearings would allow enough axial movement and the small amount of twisting needed. Cheers PK
Yes the rollers have more centrifugal force at high rpm. One of the biggest advantages of bearings with ceramic balls, they are even lighter than steel balls. Rollers are like you say, both heavier and have more friction due to the larger contact surface. But they can endure higher loads, if that is a problem.
It seems like the benefits outway the disadvantages. Rollers make more power vs C3/C4 ball bearings. Strange really, you'd think they'd bind up from bending at high rpm, maybe they actually reduce how much the crank can bend. Maybe two bearings pr side, or really wide ones would work even better.
Not every theory survive practical work you know, thats why I questioned it instead of claiming it 😉 I enjoy your vids by the way. Been a while since I tuned two strokes, but I have both a ns400r engine and a Yamaha v4 115hp outboard that I’ll be playing with this winter
What's the blue grass music that plays when you're using inclining tool? There was other cool song in other video that i really liked. Put music info on video notes. Cool stuff btw!
exciting stuff... supercharger and drum controlled zorst valve sounds like its got big potential too ! sticky's 'buzzwangle' tool looks bangin'.... I want to tune the fek out of old vespa gs 150 ( reed valve and stroke - an original piston ported barrel )… should be fun :-)
Thanks!
hello can you tell me where to find the drawings of the aprilia rsa cylinders thanks?
Very very impressed........but one thought. Maybe look at hub centre steering, to try & get frontal area down? Keep up the great work.
Contrary to popular belief, I'm very interested in what your doing. If you check Mikuni charts, 32mm carb is suitable for about 50bhp per cylinder (in multi cyl applications) You've probably done the math, area of carb is 804.25sq mm. PWK isn't highest flowing carb but it is way cheaper than a smooth -bore or Kei-Hin CR.
Thanks, I know. There's a few better options but yeah, money. Yep, a 32mm carb can flow alot more than what my engine can ever produce, but remember the intake isn't always open, and part of the time it is open it's flowing the wrong direction. Then there's the resonance aspect, getting it to work well with the crankcase volume.
You've worked out theoretical intake length? I don't remember formula's but seem to remember it's different for piston port/reed valve compared to disc valve motors. 32mm carb will have pretty slow airflow which doesn't atomise fuel very well. Reversion will cause a crazy rich mixture at various rpm, have you thought of reed valve intake as well as rotary valve for high rpm timing?
With the variator I don't need anything but peak power so a properly timed rotary valve seems likr the way to go. My intake philosophy is simple - as short as possible. A tuned intake would need to be ridiculously long to have any real benefit.
2STROKE STUFFING I could see that the intake lenght could affect a lot when using big carb. As the flow speed is slower on bigger carb, and the intake flow is still changing direction as the intake closes, a longer intake (tuned length) would actually help there. As the flow is changing it way to back on the carb, longer the way to venturi, the smaller is the change to mess with the AFR ratio, and smaller “blowback” from the carb. So in theory, (and usually in real life too) this helps the carb work right, and helps to get more effiency and mixture in the crankcase.
And you can make the intake as well slightly smaller diameter than the carb, ofcourse matching the ends to carb and port, to increase the flow speed.
And as your engine has pretty small (Read: right sized) crankcase, and it does not have reeds, it will be a lot harder to get big carb/ short intake to work properly. As the mixture and carb flow/ pulse is interrupted badly.
But into the 90˚ turned cylinder, it will be gaining advantages. As still, I would maybe not go with the huge 1-window exhaust port, as I go with that myself with good success (But on extremely lower tuning levels)
As the extremely wide 2-window (100%?) maybe the way to go, as I see the 3-or 4-window exhaust port not needed/ restricting.
I’ve had ran a 75-80% (real) 1-window exhaust port on big bore cylinders, and with different pistons.
1-ring pistons have not taken it too long. 2-ring pistons have survived longer.
But the key is in the rev-range= I could rev the 1-ringed much more higher with much more power, with the same ports, pipes etc. As the 2-ring piston is more heavier etc, and has more durability, it maked less power, it revved less, and cracked the whole intake side of the piston off! And that has happened many times.
So atleast turning the cylinder 90˚ prevents those things to happen, as you are thinking it of right! 😊
Keep up the good work, and don’t care if people thinks you’re a hiphopper (from your clothes) as you’re a smart guy and great mechanic!
And though also that you know the Athena makes a 50cc “powervalve” racing cylinder for derbi and minarelli engines.
That would be interesting too, as it has the exhausta powervalve.
Some guys here in Finland is running those cylinders on various bootleg moped racing setups.
What about the FOS symetric 2 stroke system from Luc foekema?
Incorporate a fluidic diode in the transfer port to eliminate back-flow and extend blowdown time.
Im going to install this in my banshee!!!! When U finish making it!!!!
Cool, No clue...
Spennende stoff, tror du må teste plan B med en ekstern kompressor som pumpe istedenfor, eller i tillegg til veivhuset som pumpe.
Du kan bruke veivhuset som pumpe for noen kanaler og så bruke kompressoren til å lade overtrykk med på en port som er timet av noe annet enn stempelet.
Have you polished exhaust ports?
Because that will increase power a bit
Every little bit helps!