When Vtec hits in a Supercharged Two Stroke.

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[@stuartbradbury9514]

With all the troubles and testing you easily forget how well that little piston is dealing with all the forces and the cylinder is working great

[@slartibartfast2649]

Fuel delivery has been the only problem, really. The rest has been an absolute gem. Fingers crossed nothing will blow up.

[@kasuraga]

​@@slartibartfast2649 Yeah i feel like this little engine can handle quite a bit more before it starts popping parts through power.

[@malcrandall1309]

Don't forget the poor old conrod!

[@DarkIzo]

when you think how many episodes were spent on casting, boring, plating the cylinder and stuff vs all the current episodes with carb issues running that engine over 14k rpm crazy progress and crazy resilient engine

[@layeredchip3220]

I love this dude. Almost every episode he goes “ I am an idiot now let me explain why in this extremely detailed presentation.”

[@riz3nfpv306]

The ability to be constructively self critical is underrated.

[@leejones1041]

everything he does he knows why and why not, the truth of being doctor house involved in differential diagnosis of what is wrong. a great engineer.

[@jacobburges1374]

Drinking game: Every time Alex says "We'll see how it behaves..." after a crazy modification.

[@propsychoxx1581]

Drinking game 2: drink every time he says "suck" in presentation. (Not recomended). I was laughing my ass off more and more after every "suck". Best presntation ever, hats off.

[@TinchoX]

@@propsychoxx1581 Yeah the engine sucks a lot and then he says that it doesn't, it just blows! I'm as confused as you are. 🤷🏻

[@mikmorpheus]

@@TinchoX that's why I love this channel so much... He's just a normal dude with a crazy mind 🤣🤣

[@tinmanssaws]

Your ability to adapt and overcome issues always amazed me. Great job!!

[@alexstromberg7696]

Hi tinman, big fan

[@crperformancetucker5065]

Tinman gonna have a turbo husky if he keeps watching this channel i can see it now

[@heathkill4821]

This man should be a multimillion dollar engineer

[@sensoryoverload673]

Woah I saw you in a Buckin' Billy Ray video once, small world!

[@2STROKESTUFFING]

Thanks man!

[@johanholmgren1101]

Really fun to watch the little arduino controller work, and move the cardboard strip up and down at 8K automatically. Great job! Also love the jazz music. Excellent production man!

[@2STROKESTUFFING]

Thanks! Working great, was afraid it would struggle with noise from the ignition, but seems to cope.

[@pebrede]

In the 1960’s Studerbaker supercharged their Lark and Hawk’s engines with a Paxton belt driven centrifugal supercharger, in a blow through configuration. They could not get it to work on boost until they put though whole carburetor inside a pressure pot. The prototype setup was the entire carburetor in a food pressure cooker with pass throughs for fuel and control cables, and a port for boosted air entry, a side entry with a baffle to reduce turbulence was the final configuration, from memory. Fuel pump was mechanical diaphragm pump with an atmospheric vent port hooked up to the pressure pot to provide fuel pressure above boost pressure in a controlled fashion. Production was a split alloy casting that did not require a hole in the bonnet/hood.😊 They tried all sorts of pressurization/pressure equalization paths prior to the “pot” without success as leaks in fluid paths and flow instability were not controllable. What’s old is new. Hot Rod magazines of the period had some excellent write ups on this and many other now new/modern innovations. The wheel has been invented, no need to try and do it again. Take care and play safe

[@bismuth7730]

Your persistence is admirable for real. I would have quit all of this long time ago and i want to change that about myself. You just keep on going no matter the amount of problems you face.

[@2STROKESTUFFING]

Thanks! I like having problems to solve😁

[@foreverhungry84]

this is possibly the most bad ass 50cc to have ever existed. the flames from the exhaust are rad. good job dude

[@2STROKESTUFFING]

Thanks!

[@danielsatko]

wankel 50cc akes 50hp NA, land speed record aprilia RS makes 30hp

[@trcxsa]

The venturi in the carb causes the suction for the fuel. Boost referencing the float bowl to static pressure should help but will need to be done at a diameter close to the carb diameter. In the big tube leading up to the carb the static pressure is higher than at the front of the carb as the air is traveling slower. ( You essentially have 2 venturi's with that intake setup)

[@BloodyMobile]

The explaination at the end about why engines suck was the best I've ever heard on that topic.

[@mrturtle3531]

You teach me a lot about carbs and engines. Its astounding what simple of a concept 2 strokes really are and it is amazing to see it being pushed to its limits

[@johnpezaris6982]

It sounds like the reed valve servo could be engaged earlier, maybe? I thought the engine was bogging a little at 8K. Also, it's worth adding hysteresis to the controller if you can: engage the servo at 8K (or whatever threshold you select) but disengage only when the RPM drops substantially below that (e.g., 7k) so that the slide doesn't flutter. I keep thinking back to the roots compressor and how effortlessly the engine started with that supercharger. Although you haven't dialed in this setup yet, it feels more sluggish with the turbo lag and doesn't appear to be making as much power. Maybe keep in mind the possibility of going back to a roots blower, but make sure the blow-off valve works during backfires so that you don't damage your blower again.

[@dkjens0705]

Oh man, a whole stand-up comedy could be written about your use of the words suck and blow. You are such a down-to-Earth refreshing guy to listen to, love it.

[@LauLauisnotreal]

These videos are so calming to watch even if you’re not into 2 strokes or engines you can have it as background noise and it’s just perfect

[@klipschaholic4life]

If you still have issues with the slide in the carb sticking and you have enough material to mill a couple of slots, PTFE bronze or graphite filled strips can be added to lower the coeffcient of friction. You can get these from a hydraulic supply house in several thicknesses and widths. Methanol and nitromethane resistance is excellent.

[@dennisford2000]

The jets can be run pwm too , allowing you to dial in the best mixture for each rpm, graph it , then arduino the map .

[@lionelcook8522]

Great work Alex, regardless of the next step, your engine is sounding the best it ever has.

[@Barthoization]

damn, you have come a looong way from pouring your own cilinder to this. Way to go.

[@roboman2444]

If you ever run into interference issues with that servo, a pull-up resistor on the signal from the ECU to the arduino might help. Also, small smoothing caps on the servo power lines tend to fix weird issues.

[@Z-Ack]

Do people use crystals with arduinos for syncing or is that something the arduino just does?

[@roboman2444]

@@Z-Ack Most arduino boards have their own clock crystal.

[@2STROKESTUFFING]

Thanks for the tips! I was expecting interference, but non so far.

[@dukie1616]

Have been following this journey from the very beginning and it’s always so entertaining, really one of the most interesting builds on KZbin. Definitely should get a whiteboard/dry erase though for the explanations diagrams. Very cool keep up the good work👏

[@mattdobson1984]

Top tip, when smoothing out epoxy (or any other glue) use Grimex wipes (they are like a hand wipe), used for cleaning many things including hands in industrial applications and used ALOT in motorsport!

[@thejohnnybob]

I typically just spit on my fingers and use the spit as a barrier between the glove and the epoxy or RTV. Much cheaper than Grimex wipes. Also, spit method is used widely in aviation/aerospace in non-critical fayed sealant areas.

[@stefanoferrero7586]

Great project man, I really appreciate your blackboard with a hole in the center 👍

[@skipjack996]

Try boost pressure on the top of the slide to equalize the pressure

[@bobod830_9]

He did last video but it didn't help enough.

[@sidecarbod1441]

I used to run an Lectron carb on my KTM 300. The idea of the two numbers on each metering rod to give you a high and low mixture strength reading is a great idea in theory but when I spoke to a metering rod supplier, he said that in practice the numbers just do not work in the real world! This makes this system totally useless so I'm not surprised that you are having problems! At small throttle openings I was able to detect that difference in AFR with just 1/4 turn of the rod, I guess that an alky burning engine is not quite so fuzzy but even so you need to make small changes to the height of the rod once you get into the ball park. I must admit that I was not all that impressed with the build quality of the carb, I now use a different setup.

[@davidf.8497]

The explosion at high RPM is really impressive. Awesome job!

[@danielbriggs7110]

Yeah from 11k to 16.500 it absolutely rips 😏😏😏

[@SteveEh]

That explanation at the end was intense! And seems to be correct. Can't wait for the next one, I saw it hit 17hp on one run, once you get the fueling right; this thing is going to be a ripper!

[@jdsstegman]

Yeah, there is a problem from going off the venturi effect to a pressure effect. Your diagnosis is spot on. I understand your method. At some point in the intake pressure your power jets will not work like they should because they rely on the venturi to have air drawn past them instead of pushed by them..... you may need to have a type of metering rod on your torpedo tube. Skidoo and sled manufacturers use vacuum or pressure system in the float bowls to change fuel for altitude compensation in their older carburetored snowmobiles. They way they change bowl pressure or vacuum to essentially change jetting mixtures. This may be a solution to your jetting issues......

[@chrispy1965]

It is not about sucking in the air. The innerdiameter in the middle of the carb a bit less then the entrance and outlet side. That gives a acceleration off the airmass. And that is what creates the difference in airpressure.

[@Rexxy_90]

Vafan, ville se mer! Skynda på med nästa! 😁😁

[@bardeivindbakk6993]

Altså, plenty med episoda. Va ut og kjaur moped i ein episode. Episk ass.

[@MultiToj]

Ska inte du börja med ett turbobygge? ;)

[@internetttroll1908]

@@MultiToj Turbo Rox lol

[@leolinde6977]

Jag trodde du hade dött, vad glad mitt 15 åriga jag blir

[@sendit2588]

Bro it made so much sense !!!! I've followed you from the beginning of the build, I'm a smoker nut myself from Texas!!!!! You have taught me so much that I knew you were going to remove the "pitou"??? Tube !!!!!! Thank you for your knowledge 🙏

[@thejohnnybob]

Pitot, or dynamic pressure is used in aviation to help determine airspeed, but also in engine fuel systems to compensate for forced air flow like a supercharger on this engine or a jet engine at speed in flight. Jet engines use compensation bellows to essentially squirt more fuel into the combustion chambers for a given throttle position and inlet air pressure.

[@ametti000]

You need the boost reference. The boost pressure over the needle will just blow the fuel back into the bowl. You need to pressurize the bowl so that they are equal and your old mate Bernoulli will take care of the rest.

[@2STROKESTUFFING]

Yes, I won't delete the whole pressure reference, just the pitot tube part of it.

[@gritzlor]

How about turning it 180 degrees? Take it to the extreme difference right away with minimum effort…

[@crautoguy8384]

That Carb cracks me up that thing is gigantic It's so cool making some progress buddy I love it

[@crautoguy8384]

Cut that pito tube at a angle sticking up vertically with the High point tip of the angle cut towards the carburetor to cause ventory action Maybe Everything sucks sucks I'm laughing my a** off this is a great video Not an expert just making suggestions anything I've ever suggested to help along your journey Only food for thought keep up the good work my favorite channel I look forward to every video

[@SLAINDRAGON2693]

Every time you said 'succ' I giggled like an idiot. Both educational and informative and yet here I am, immature to a fault.

[@JohanFroloff81]

26:06 When you need a chalkboard to explain the night before. (Sucking and blowing)😁

[@Torqu3e]

The surgical tong things are called Hemostats, you and Simon Crafar from MotoGP both forgetting it was quite hilarious to watch.

[@andrewwasson6153]

All my motorcycles have slide carburetors. They’re vintage now from the mid-80’s and I treat them delicately. It’s weirdly satisfying watching Alex put the slide in a vice on the drill press and modifying his. Also, the engine is really running well. It’ll be just that much better after getting it less rich at high RPM’s.

[@paavokaleva]

This is like a good wine - it gets more and more better every episode!

[@glitterbrains69]

Geeze, this is getting crazy 😅 17k! It's revving into outer space lol. Really awesome work, this channel has really come a long way 👌👌👌

[@bransonbasher6534]

Nice segue into the sponsor promotion.

[@vmcmark7578]

An ice cube makes smoothing out epoxy so easy that it shouldn't be allowed. Water on your finger works just about as good. The ice cube on a flat surface done at the perfect time during set-up almost makes for a ""NO SANDING"" repair job, just takes some practice to figure out & know how long to wait before doing any extra working with & flattening of the epoxy. Holding it ""UP"" when doing a repair on the full gravity down side with ""DUCT TAPE"" works awesome +++ you can work the epoxy through the tape after it gets harder with a flat tool or your hand & fingers to help with the finished shape, let it set-up and dry, remove tape and finish shaping!!

[@brendanhayward1803]

"their engines suck...mine doesn't...well not as much" 🤣😂🤣 KZbin gold! But yes loving the progression small steps often is leading to results.

[@erniemathews5085]

Int the 70s Soperbikesbike, flat-slide carbs wound up with roller bearings to let the slide move freely.

[@carpme]

I love how simple two strokes are.

[@maxpower700]

simple? id say they are magical wumbojumbo compared to four strokes :O less moving parts, yes. simple in the sence how they operate and/or maker power? magic.

[@my1nzfe]

That's what makes this so hard. Not easy to improve the concept.

[@dietznutz1]

Yeah ikr oh wait

[@malcrandall1309]

I'd hate to be a scutineer having to check this bike over prior to speed trials.

[@davidgierke7582]

Mechanically they are the simplest. Thermodynamically they are the most complicated.

[@HarleyDavidsonWizard]

Amazing work and talent as usual. But that work with the vtec Arduino was especially impressive.

[@fisshuman]

28:23 it seems like too much sucks in this video. That make me laughing non stop🤣

[@HaloWolf102]

27:42 Very in-depth explanation. It's all clear now. 'It sucks'

[@KoldbruiseKlips]

The "suck and blow" explanation was worth the price of admission lol

[@Oxim1nus]

Literally a dream came true, hell of a sound tune it produces and that backfires make that engine sound mad man!

[@andybobandy641]

I have learned more about Engineering in 10 of your videos then I ever have in my 50 years of tinkering with mechanics. Keep it up man, you are so close and so awesome! Oh pardon me, .. you are awesome, your lordship......

[@i_am_terom4810]

29:43 i think you did a great job explaining yourself, you would be a pretty good teacher, because in a way, you already are !

[@viktorandersson7819]

I just realized Alex might be close to actually finishing this engine. Will you still finish a PiP engine without a blower? And will you give the old supercharged engine a new chance with all the new knowledge? The symetrical transfers and rotational intake and exhaust ports are really interesting :) Having the record for the most hp out of 50cc with AND without forced induction would be awesome :D

[@RaceLab37]

As JB Weld for sponsorship. Loving your blackboard lesson at the end!

[@natereinhold6180]

Hands down my favorite fabing channel!

[@brannon1221]

This was a awesome episode. This little monster motor is coming together.

[@prlien]

Du e bare genial, du har et engasjement uten sidestykke 😀 Måten du forklarer på er lærerik og underholdende, jeg har add å sliter med å holde fokus osv, men dine videoer holder alltid trykket oppe å forer dopaminet 😅 Ønsker virkelig du kommer dit du ønsker 🙏🏻🙏🏻 Veldig bra filming og du har funnet din egen saturation i farver som funker veldig bra 👊🏻

[@2STROKESTUFFING]

Takker!

[@robertbritton4716]

Ok man this monster is starting to come to life, One of the best trouble shooters in the game, can't wait for the right storm to come and you get the lighting rods out the roof

[@dacianazerinity2052]

You're very likely right on the tube! Also holy shit the FLAMES on that beast! Your creation is just so amazing! Can't wait to see what the power figures are this round! And omg when it sang straight to near 20k? I would say I could die happy but I need to see and hear more!

[@tylermaguire616]

Before Kaaden’s work, two-stroke engines were 100 hp/liter. using an oscilloscope, metal-shaping work went 200 hp/liter, Bugatti Chiron from modern day 187.5 hp/liter. I believe forced induction and high pressure fuel injection is the final form 👌

[@Acamperfull]

Put a T in the tube that pressurizes the float chamber and an adjustable bleed valve on it so you can easily limit the amount of boost pressure compensation in the float chamber. Another suggestion: fabricate/grind your own throttle needles (for example from bicycle spokes), you already have a jig to measure them!

[@badijks]

When the reed valve has been slide away it has a lot less restriction and at higher rpms it reacts better on the accelerator

[@blueovalracing1582]

Congratulations my good man are in order for The Screaming Mimi motor is definitely screaming beyond belief with that said I give you the highest salute possible for your efforts I salute you

[@thedarkknight1971]

I was waiting to hear the mighty blown 50cc motor sound going WOT from about 2K RPM... I used to have a lot of fun with my 1999 Honda Accord 1.8i VTEC doing that, after i had ditched the standard airbox, fitted a cone air filter, and freer flowing back box. Getting into second or third gear to 2k and then flooring it.... That sound of "vrrrrrrrrrrrrrrWORRRRRRRR!" Hahaha 👂👌👍. 😎🇬🇧

[@curthazlett595]

We have had a bunch of slide sticking problems with lectrons. Now we run big ass coolant heaters on the carbs

[@tonynewcombe9075]

Man you sure do live your life. Fair play to you mate , 😅 I love to see you & your work in progress.

[@darrenloveday69]

brilliant show! bet that noise is pissing the neighbors off

[@ronchappel4812]

For what my opinion is worth: I think you're right in removing the float bowl pressure. I've only been watching a few months. What Does everyone think about the expansion chamber? As in - is it necessary at all? My instincts are telling me it complicates things, and likely fights the supercharger

[@lighterguy82]

I wonder if you could beat a lot of the problems with supercharging a 2 stroke by just putting it in a box and pressurizing the box

[@GonzoDonzo]

May even make it more compact

[@unmountablebootvolume]

That is exactly how some european HVAC equipment manufaturers, for example Vaillant, Junkers (aka. Worcester) and Buderus solved the problem with the burners in wall-mount gas boilers being REALLY difficult to adjust, as even the slightest pressure difference in the house or change in chimney draft could easily throw off the whole mixture adjustment: They just put the whole burner assembly and everything attached to it into an airtight metal box within the boiler, with only two large pipes connecting the exhaust and the air intake with the outside world. This guarantees that the pressure differential will always be near or exactly 0, as the exhaust pipe is usually inside the intake pipe, and both end less than a foot from each other. The gas valves also have a mechanical pressure compensator, which keeps the mixture constant, even if the ambient air pressure changes (weather, storms pushing into the air intake, etc...). This means it will always meet emissions requirements, no matter the weather or indoor air pressure.

[@jjhack3r]

You only need to put the carb, gas tank and supercharger in the pressurized box

[@robivlahov]

@@jjhack3r no need to pressurise the supercharger... just the carb. on the fuel side (tank) just use a pump its easy with a rising prtessure regulator ...

[@kristiangoncalves]

Absolutely love this content keep it up mate. Plus I love your attitude towards your passion and it really shows in your videos

[@pXnEmerica]

Gonna have to look at those vibrations before something tears itself apart, sounding great.

[@CraneArmy]

well I'm not totally sure if I can validate anything you said at the end but I know we went from weak suck to hard suck and im here for it

[@paddy2661]

Your a legend, brilliant work adding servo motor. Suggestion install a inline tap/valve on the hose connected to intake so you can back pressure off going to carb bowl pressure. Awesome work mate love it.

[@tombig4011]

Most awesomest thing on KZbin are what your videos are 👍🏼

[@adamwhite2120]

I can't wait till your next video. The progression of this project is top notch 👌

[@rockn4]

It'll be interesting to see how changing that vacuum tube changes things. I had a thought. Instead of thinking about running rich as too much fuel, what if you changed the supercharger pulley to get more air? I think you said you were originally running it with a smaller pulley to reduce its output. Good luck and love your work!

[@americanmechanic909]

25:40 very nice fireballs.

[@miken966]

I just made the same sound when the vice slipped off of the drill-press... LOL

[@ettla123]

28:17 "Hard blow, sucki'n on that tube" Best episode ever

[@romano5222]

The 'smaller suck' is called venturi effect ;) I'm glad you considered it . I'm just sharing theory trying to help, you're the one trying things, it's a pleasure to see you experimenting ! Keep on keeping !! ;) ;) Awesome 'reed tech' BTW, you're a genius !

[@johnmitchell8188]

The 'suck' diagram looked like the chalk drawing that was placed upon the back of a friends boiler suit, for a few hours without him being aware of it. Nothing to do with me of course.

[@scottwaterfield9796]

I agree with your chalkboard explanation. the current pitot setup may also work to your advantage if you want to run this engine with high nitromethane concentrations.

[@Linuxxl]

I just finished watching your explanation again after recovering from rolling on the floor laughing. Turns out that besides funny, it's also very educational! 😄

[@krakhedd]

It took until you explained your voluminous crankcase but yeah you made sense: No adaptation necessary as it always functions under blow

[@Z-Ack]

Sounds to me like it just needs some active engine management hardware to constantly make adjustments to everything, like a holley efi or terminator.. or the fuel tech ecm they developed.. these drag cars are using them to adjust timing on the fly based on everythibg from s laser height sensor if they pull the front tire to traction control and even using both 85 and methanol in a single run.. everything could be done the same with an arduino but the programming is the part that would take the time.. the way those ecm's have all the different systems talking with one another is next level.. soo many parameters and motor safety..

[@carlmalone4011]

Great work. I still think that a fuel injector in place of that goofy carburetor is going to be much easier to figure out and tune.

[@stevenhoman2253]

For various types of electrical connections, you can make a few different tools, using broken hacksaw blades. Measure the width of the gap in the female (rear side of the connector.) Then mark your blade to the correct size. Tape the handle or create a wooden one if you like. This is a tip for those who are doing this all the time.

[@larrysorenson4789]

O my God. If this guy’s name was only; Olaf Tinkerer! 🤣👍

[@ph0end]

The screw is both missing and not missing, until you observe it

[@tinymotogarage]

What an incredible channel - This and Fortnine are the best on KZbin.

[@poprawa]

Plumb both float chamber pressure outputs styles in the intake and then you can balance them out with obstacles in tubes, valves or pinching of tubes

[@poprawa]

Waait, this is stupid. Component that is already installed to output pressure for float chamber can be rotated. With capability of getting richer while mass flow to intake gets higher when faces flow direction, neutral when 90deg in relation to flow or leaner when rotated with flow. This is tunable and probably in more than enough range. Also, when rotated in throttle direction it will put funny higher pressure wave when throttle closes from being wide open - maybe able to trow flames :>

[@jimbagle.3939]

Forgive me if I'm wrong but I believe making the carb opening larger will decrease your pressure and increase volume therefore leaning the mixture because it won't be pulling on the Jets as hard but I'm a simpleton I could be wrong

[@EnduroDroneHub]

To adjust a metering rod you could use plumbers solder and file it to desired profile and simply remove it at any point without damage. I use plumbers solder when tuning my Jets and drilling them out. It may well work on a metering rod 🤷🏻‍♂️

[@establisha]

really love the longer format videoes! you got my like! :)

[@jimrobcoyle]

You have gone so much farther than my canal transfers with the cylinder wall cut away in my 1963 55cc rotary valve yamaha"s cast iron cylinder. But, my piston did get a window, too. #Aloha

[@akos127]

Just 2 thoughts, 1 if you blow into the carb, it is prone to leak somewhere, build an easily removable air-tight cover (maybe see thru), so the whole carb is pressurized, or 2. move the supercharger in between the engine and the carb so you only have to use SUCK (Unless the methanol destroys the sealing edges inside the charger?) Sorry one more brain tease, if you have a supercharger, do you still have to have an expansion chamber??? Maybe a straight pipe all that is needed. Otherwise, I always waiting eagerly to see your videos, nothing worst when you take off for a holiday and we just waiting and waiting nothing better than see you hiding from the police or singing aside your glass of rum. You should have hit 25HP by now. Keep up the exiting work!

[@danijuggernaut]

I thing you need a surge valve that closes when the compressor begins to blow over atmosphere pressure.

[@bernie7613]

That explanation didn't suck!

[@billymanilli]

Dude, you're freaking AWESOME!!! Love your work, always! Thanks for sharing with us! p.s. why are those Lectron carbs SO expensive?? I think that's nuts what they charge for those things...😒

[@96vmax4]

If you can't lean it out at the big end open the body of the carb for more air

[@adrianverwey5053]

Great content as always. Great jazz music!!

[@spudjames5038]

That's "blows" that it dosnt "suck". Only 1 other time in my life did I want someon...... something to "suck"!