@@AmirPomen we took the metal reeds out of our Yamaha bikes and put in Kevlar reeds and a better tick over and at higher RPM the Yamaha RD200 it give more power and the ,2stroke oil has the best you can get and the oil tank were kept full and just a little in the tank as with higher revs and I can say it made a better bike to ride,
stephen gunrunner hanson never ever run a two stroke engine with an oil pump feed......two strokes should be premix only, no no no to oil pumps, they have killed more two strokes motors than governments have! Bel ray si 7 premix please, jet accordingly through meticulous plug chops, and always take into account atmospheric conditions sir....oil pumps, bin them!
@@csud9540 But for higher loads the oil pumps on for example a rd are build to increase more oil. Only thing that can break is the cable to the pump? Otherwise you have a fixed mixture even on low rpm and load and high rpm and higher loads.
Damn, that's a short tuned length! As happy as I am for the channel growing, sooo many noobs who think they know what they're talking about (or understand what they're looking at) in the comments section these days..
We aee at a point with this where its so far outside of whats done commonly or even in speed trials that... the next problem solved could be by smeone clueless who doesn't know what he doesn't know. Has no idea X 'can't be done' just as much as it could be someone whose well versed in this sort of things. I mean, constant rpm, a moving engine to put tension on the belt to get the cvt to cope with the power. A solid one piece ring thats softer than standard hardness. We have shifted so far outside accepted 2T tuning wisdom we have bugger all to go on but fuck it test time.
@@jediknight1294 I get what you're saying, but It's the "it needs an expansion chamber", even when he shows one in the very video, or 'this is pointless, look to late 70s' dirt bikes' (like 2t evolution stopped there) comments i'm talking about. Swinging engines tuned for certain RPM and CVTs are nothing new in the moped world, neither is controlling the variation manually, specially on french bikes (le resistance). This is all about achieving a 360-degree exhaust port. The resonance pumping action, large shaped case volume, and primary intake with injection, (making it essentially a pulse-jet piston engine), are icing on the cake.
@@macelius oh I know the CVT is nothing new but iv never come across the idea of moving.the engi e to keep the cvt in the powerband. interested to see what happens and how they affect things because Sooooo much moped tuning lore is based on 'feel' and the reputation of the tuner/person talking about it. Theres so.much bollocks in the industry designed to rip off 14yr olds. Must admit I'd have gone for a conventional gearbox by now tbh but I hate CVT's with a passion tbh. I know what you mean about clueless though, currently having a discussion with a guy on this videos comments who is calling me an idiot and clueless and that iv obviously never worked on a 2T before because I didn't agree with him.that it needs an expansion chamber and shouldn't be fired up until the exhaust has been made who then talked shit to me because iv commented that a straight pipe.is fine for development work where you have no idea whether a ring will die 30s in because apparently building and developing an engine from.the ground up is totally the same as buying parts online then bolting them to a 2T moped or dirt bike.
@@jediknight1294 Exactly those kind of people. They had a goped when they were 13 and they think they know more than he does. Of course, even a straight pipes tuned length is best for a certain rpm (and it looks like this one is about the same as the expansion chambered pipes tuned length is going to be); the wave is not shaped and the scavenging effect is not magnified, but it's there. Racers realized this in the early days and started cutting their pipes down, then came trumpets, then came chambers. Then came computers. Anyway, imho if one hasn't at least done the math and tuned their own ports, pipe/chamber, intake length, etc, then built that engine, tested, re-tuned, etc at least a few times over, one probably has little to offer Mr. Stuffing in the way of technical advice, and should probably stick to encouragement and paying attention trying to learn something :).
@@macelius iv done some tuning and some of the maths though I used a lot of help with a platform that has had a lot of R&D so know my limitations. When it comes to total one of R&D, I'm somewhat out of my depth but I understand the principles.
Yes yes i thought the ring was a problem but it seems to work very nice... i hope you can run you engine this is a very cool progect i am wating for the secondary intake and the injection sistem
I really like your ideas on high RPM's but my two stroke is a chainsaw, old vintage machine with all exotic metals for major velocity. No real room for a fancy exhaust system. That is my achilles heal. Also, to much RPM and the oil just is flung from the chain and bar. Like your ideas, hope you make things happen. Peace and stay virus free too. VF
I was thinking that dirtbikes would be a good place to look for engineering focused on mid rpm power. I wonder if a small box style exhaust could be made to function like an expansion chamber. If you could find a way to fit a long pipe to the saw, that would be a huge power increase.
@@framegrace1 or you have cause and effect backwards... if the reeds fracture first then it will backfire. You cannot have an inconsistent thickness, they will just break. That comes from 40 years experience of racing two-strokes!
Primary compression is a big deal with the little chainsaw motors I build. Partly because they are SO over square. I wonder if there is a way to "vary" that volume to optimize as the RPM's go up and the pipe begins to work. Husqvarna "performance" oriented saws like the 562 & 576 have crank stuffers to jack that primary compression. One difference being in addition to being really over square, chainsaw motors have "pressure can" exhausts as there is no space for an expansion chamber. ( Still would be totally off beat and cool using an electric super charger / pump to pressurize those cases to at lower rpms to get things started :) )
Hey, I was wondering since you are running the engine at more or less constant RPM, would it be a good idea to sun steeper baffle and diffuser tapers in the exhaust? Unless I've not understood correctly, a steeper taper makes a stronger pulse but over a short time period, and you are tuning the engine for a very specific time period.
i once calculated and fabricated a pipe according to Bells two stroke book to receive a baseline, could you maybe share with us some info on how you calculated yours or arrived at its form?
About the assembly lubrication. I've started using biltemas chain-lube when assembling, very easy to apply and it's sticky and stays in place where you apply it and doesn't run away and end up somewhere else when you're about to start.
iv'e watched everything in this journey,and relate extremely well to all the ideas and experiments,im just the same,learn,make mistakes and move on,in my circles terms, alex is a "doer" top bloke,he is an inspiring character,and due to youtube and other social media,we are all witnessing something amazing,we are all behind his endeavours and his willingness to educate himself to prove something,be it right or wrong,i'm hooked like many others....in a negative thought......this will end at some point,but bugger it,this is like no other insight into another mans passion and struggle..big up to "mr stuffing".i salute you.
Ugh. The old I read internet stuff so you should make it better with backpressure. I don't understand why people who don't get how engines work will just regurgitate bullshit some idiot said or posted on whatever. Backpressure is never good on an engine. EVER!!! if it runs better with a certain exhaust system it is because of pressure waves aiding in cylinder filling/scavenging of the exhaust gasses. If you think backpressure is good go watch the latest engine masters on motortrend.
You just need a faster drill. Forget trying to run this thing below 5,000 rpm. I wonder if you could make some sort of geared starter? It would be cool to run it in a broader rpm range. I'm interested to see what you come up with.
It's a common misconception that you want back pressure from an exhaust. But no motor in the world would benefits from back pressure. It's velocity you want a bit of witch unfortunately will inherently causes a bit a back pressure.
I think you can reduce the ignition advance by one or two degrees,because at this prototype stage without exhaust you don't need much ignition advance. You cannot follow the ignition advance that the rotor manufacturer recommends.They usually recommend an ignition advance based on more than 80cc.
Have you ever seen the pipes that were designed back in the 60's and 70's i think that the pipe was allowed to "slide" back and forth to help its "tune"? Another very complex item for your motor but I always thought they were a great idea. Also, im sure you covered this but did you ever get your cyclinders properly nickeled? I, AS A 2 STROKE LOVER, AM VERY PROUND OF YOU!! IT DOES RUN!!
I often wandered why people reduced the volume of the crank case other than aiding flow. Is it related to the compression ratio which in turn has an effect on the tuning of the pipe?
@@2STROKESTUFFING I wasn't being a dick just seemed like it through text, I was just saying you have to go through all the mistakes that factory's have gone through to make engines run perfect
this guy has made an engine at his backyard, unbelievable stuff, how this is possible, earlier I thought it is impossible to make an engine at home but this guy proved it to the whole world that it is possible to make an engine at home. and not just any engine, he made the most powerful 2 stroke engine the world has ever seen. This guy is like the ultimate engineer who did designing, manufacturing, and now tuning and everything possible at his backyard, WOW man what a great man are you. this man deserves great respect and also he was so kind that he provided every bit of information about his engine on the internet.
Its the standing in the shoulders of giants thing. Taking a solid start based on well understood theories and rules and a passion project pushing it further. Watching this move from a modified moped case has been really interesting as he shifted from modified to pure performance prototype. One thing to remember is this project would have floundered without a whole crowd of very clever people throwing ideas out there and the fact he is working with a 50cc single engine means that machining time isn't going to be insane and material costs are really low which helps. This isn't going to be the most powerful 2T ever but it will be 9ne of the most powerful 50cc 2T's ever made. Im going to be reay interested to see the BHP/Ton figures on this thing. It will never be a panacea given its designed for WOT and a single rpm but its one hell of a project. I have a 27cc Strummer motor downstairs waiting for disassembly partly insp8red by this build. Getting back to t8nkering with 2T stuff
If the reed scratches are perpendicular to the bolt pattern centerline the stress risers seem to favour the inconsequential.... less flying chunks. Riding into the fatigue twilight zone? Edit: wrote this at the beginning from my own hindsight. It's actually good that it cracked. You'll be able to share your solution if it's more than just the right material thickness.
@@2STROKESTUFFING massive crank case vulume together with the massive volume of the trasfer feed. Will not get you enough suction pulse to pull fuler in the casings
Har du kontakt info til Christoffer Mårtensson? Jobber han i industri eller er det bare hobbyen? Jeg ville trenger litt TLC på en Ducati restomod eksos anlegg kanskje på våren nest år 😎
Never ass-u-me anything. Why do you plate the cylinder instead of just running a thin wall stainless steel sleeve in it? That's something I've never understood about certain engines including the new 5.8L V8 Ford, the old Chevrolet Vega engine, the Ducati engines and Moto Guzzi engines. Moto Guzzi's actually chrome plate their cylinders.
You have what I call piston ring induced backfire I have poulan 2000 (ported) 33cc engine and it started to lose power and it wouldn't work at idle Also starting with a drill whould cause constant backfire. What helps is couple drops of 80w90 gearbox oil onto piston ring through the exhaust. Now it has 1mm ring gap it wont even pop once. Rip poulan you were loud and ugly but u did spin a prop
Congrats on a 100K !! just wondering, is an electric turbocharger an option for the secondary intake? so you get over preassure in the crank and higher airflow. as you are you are using an injection system some push trough airflow might be viable?
Thanks! I don't think the SCTA landspeed rules will allow it. If it weren't for the fact that I'm going for a record at Bonneville I would have ditched the primary intake altogether and used an electric motor to pull it into the powerband.
If the crank case volume is too large, perhaps a variable crank case volume is in order? Similar to a choke, could have either A: An elastic bladder with a thin steel plate that is pushed by a pin on the outside to "Inflate" it B: Change the crankcase design to have a plastic shape that you can "Tuck" into the available space when it is running, and extend when starting. As another comment stated, you may also have a fuel supply issue with that dip in the fuel line as well.
Already schnuerle porting, and a step beyond rotary valve - "resonance valve". Not sure I can beat those tiny engines tho, but won't give up without a fight!
I believe after 45 years of working and diagnosing two strokes I think the only reason it runs at high rpm is due to the lack of compression try using copper for the head gasket as the heat will not cause damage and the second thing is I think the ring is not made of the right material hence causing lower compression. Don't give up just remember Honda's V-4 two stroke that kicked ass after they went to one crank, the first bike to top over 200 mph.
👍Might be that progress so far has mostly been because the ring is seating, have to do a control run without stuffers in there. New piston/ring is in the making.
Would it be helpful to build a exhaust system that you can make longer or shorter at the right rpm, i saw something similar on speed boats that runs 2 stroke engines. It's almost a straight pipe with a slightly bigger tube im the middle, when the boat has to turn, the driver can shorten the exhaust to get optimal resonance out of the exhaust. I saw this on German RU-vid channel Phillip Kaess. Greetings from Germany
When you'll have time, take a look on a super lubrifiant (only natural products. No industriel garbage) Meca-run P18. On 2 stroke you put 2% in your oil. It's totally indcredible! More less wear and increase compression. It is so efficient that you don't use it during break-in.
Could also make some sort of bladder or bellows design for that crankcase stuffer thing so it's adjustable inflated during startup and deflated while on pipe.
this guy's going to bonneville to claim the record for the world's fastest 50cc motorcycle. to get the power needed, he's building a two-stroke engine that has an exhaust port that runs the full 360 degrees of the cylinder. other main issues include the transmission - cos the engine is designed to run at 20,000 revs.
Congrats 100% of bore exhaust and it runs! That is worth a pat or your own back, my fingers are crossed that you will be able to exceed 400hp per liter reliably! Truly inovative!!!
I seen that your aiming for 600 truly inspiring! I remember when you hit 20hp I was jumping up and down right along with you 450 is impresive enough! I personally took a 130hp 799cc rotax to 170hp n/a and it runs awesome nothing compared to your accomplishments but along with lightening up my chassis it has made for an entirely different realm of machine than where I started from. I can't wait to see you get it up on the dyno and back to the flats in Utah great work man keep it up! Truly amazed by your inovation!!!
This is brilliant, very great work. Why are you calling this the most powerful 2stroke ever? What kind of power are you aiming for and what is the displacement? You got my sub, I've watched the last 4 or 5 as soon as you posted but I think I need to watch all the previous videos.
I really hope you achieve your goal! A guy in his garage schooling the nsr500 legendary hp#'s that is incredibly awesome! Your hard work and deep thought will continue to pay off i have no doubt!!! You rock man!!!
Nice 👍🏻,I do have a question 🤔why not have an adjustable stinger with springs,I done it on boat engines and it worked a treat with the right length and spring pressure.
The more I see the more intruiged I become. That is a very short pipe indeed. I am not an engine design expert but I undertand the general principles of a resonance exhaust. Is the stuffing old practice or did you come up with that idea yourself? Did you have a look at that Heron layout I suggested? I wonder if the mixture entering through the channels would benefit from a swirling effect caused by a recessed combustion chamber in the piston to improve even filling. Just an amateur thinking out loud though. :-)
👍 "stuffing" is old tech, used to raise primary compression. I really don't want more primary comp tho, but need to be able to start it. Yep, seen those engines before, didn't know the name. The problem with swirling is mixing of fresh/spent gases, you want minimum turbulence until the exhaust port closes, after that you want max turb for faster combustion.
Know this is assuming... But maybe some old steel reeds would be better for the early testing? Have old yamahas with steel reeds and they are tough. And Ive lost quite a few older honda racing bikes reeds. They would fail after hard use.
@@2STROKESTUFFING Man that engine must be making extreme power. Hmm well possibly some hardened a bit more. Not a steel expert but possibly some modern high grade spring steel at 57 Rockwell hardness would give flexibility and durability. We use the Lucifer heat treat oven at our factory for small parts. Just tossing some ideas my friend.
I'm well pleased for you. Been following this for ages now and its great to see it running. Out of curiosity what type of filament are you using for the stuffing? Keep up the good work 😀
what do you think if u install some sort of power valve on the exhaust port? it might help in starting/idle/low rpm operation... or atleast some sort of exhaust butterfly valve quick and easy method of install using 2nd manual throttle cable operation...
this might be a stupid question, but should the engine not run counterclockwise when viewed from the stator side? otherwise the bike will go backwards. Very cool engine btw
Crankcase stuffing was tried in the fifties ,sixties to no advantage and in the late seventies Suzuki started opening up the crankcase mouths and transfers to aid inertia as it was found that the easy movement of the fuel air mixture "up stairs" was better.They also added massive reed valve blocks and huge inlets too.
When you say "to no advantage", you mean for power. He is stuffing the cases just to get it started. The Suzukis probably would have started quite nicely with the cases stuffed, but not had the power
i think next case u make should have the intake manifold incorporated so u just bolt carb up..and get better angles and maybe less crank case volume...i mean new case.. to be had should go gen 3 the most powerful 2 stroke because all the little flaws and new findings it will be 3.0 buy then...... so land speed bike 3
You have fuel issues, compression issues, I think the carb is probably oversize for the motor I don't think you should be starting it with a drill pulling it over by hand lets you listen to what its doing and what it wants it sounds very lean to me and everytime it lean pops you risk breaking the reeds or something again, you probably need to goto a multi ring design on the piston
It make me a smile when the spark of life begins.And the rings survived the test that is really positive response from the engine run.You nd ur project is insane.Its R&D of an epic built.Now you are decreaseing the crankcase volume.
@@brane9401 more friction = less power..especially high rpms, i recently tried running my mt5 with only one ring in a 2 ring piston...she ran for 20 seconds and seemed fine initially but then didnt want to run at all. would a different ring help me?
Unfortunately I have no more cards in stock, and I'm struggling with finding the time to do order handling, shipping etc. Here's a link to the files, you can use them to get the card manufactured at your pcb supplier of choice(not expensive at all for just a few) drive.google.com/file/d/0B51yUCR0gADEUTEySzBfelZUSVlvV1pSN2FPdUo3MnZRRTJB/view?usp=drivesdk A small donation would be much appreciated! PayPal to 2strokestuffing@gmail.com Alex
@@2STROKESTUFFING cool thanks for the reply. Was thinking about putting a pwk 28 maybe even a 33 on my daytona anima 190-4v the pe28 keihin (made at China plant) that came with it is junk the throttle spring is giving me issues compressing and not springing back causing throttle hang, like it's not the right spring material. Junk Chinese* i keep having to pull/stretch the spring every time I run the bike.... having a hard time tracking down a 22mm x 110mm slide spring. Might force me to find a pwk28 or 33
