Righting Wrongs Part 2 - Quest to the Most Powerful Two Stroke.
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- Опубліковано 30 вер 2024
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It's kinda strange how much the 'Welcome back to my garage' part means to me. More evidence that I may be autistic lol. This journey means a lot to me. The intro is like a golden portal.
the last episode made me nervous without it smh haha
Even more important, ‘see you next week.’ I start getting stressed without it!
same^^
I like ordinary sausage's intro.
pavlov's humans
If Alex doesn't drum some 2-stroke parts in his videos i get concerned 😁
This iteration of the casing looks a lot more robust. Lets hope it provides a firm base for the next set of testing.
it might be a stupid question but when is the las time you have checked that the mill is true ? like checked that all axes are 90 to eachother?
What an ending to the week! Some engineering skills you have there sir!
and he improves his brains all the time, and take suggestions really seriously when there is actyally sense.. i dream my own garage, as a welder but this is what i follow to fill that cap haha
Seeing a new video of yours has come out gives me a dopamine hit without a fail. It's excellent to see you improve not only your mechanical skills, but also content creation skills. Your perseverance is both awe-inspiring and satisfying. Thank you for the great vibes, Alex!
Ive just acquired the blueprints for a 125cc 2 stroke twin GP engine that was a still born project due to regulation changes, so im going to be spending too much time in my machine shop soon.
Would you consider documenting it, or even doing a video series? Even if it is as basic as it gets?
@@mozer30I would tune in for sure!
Just subscribed to your channel in case of any updates on this project. Would love to see a 125 race engine with mad scooter type porting!
Would you give us a taster of what might be up coming.
I would suspect it would be based round the MBA, parallel disc valve twin. I think they were 5 port back in those day's.
I am always waiting for your videos. You continue to amaze and mesmerize me. I feel like I’m right there with you in the room cheering you on. Adapt and Overcome!!!
I wonder if a tesla-valve would work as a one-way(ish) intake for a 2-stroke. Tesla valves have no moving parts. They restrict air in one direction but not the other. The effect stacks so you can make them more restrictive to back-pressure by increasing the length. They do have a complex shape, which is probably why they weren't used historically, but it may actually work now that 3d printing is viable. Ever consider them?
I suggested this same idea a while ago and would love to see it tried out as well 😅
_"They restrict air in one direction but not the other. "_
They restrict it in both directions, just more one way than the other. The losses would be pretty bad in something with high speed airflow IMO.
I think the issue with a tesla valve would be that it's not 'digital' for a lack of a better term. Rotary and reed valves are basically on-off. Tesla valves are 'soft' at restricting reversion. So I think it would act as if you added case volume - not a desirable situation.
But I think in the right circumstances it probably could be made to work.
@@ferrumignisagreed,a less is more thing.yes you get flow but also a slight ebb.not ideal with high power and rpm.just my thought.not an engineer perse,but keen to learn these new things alex is trying.
@@ferrumignis all valves have some restriction, or using some power.
you might really need to add somekind lubrication on that rotary valve, there is so much friction and rpm and your fuel is 2% oil mix ?? some tiny pump to pump some 2 stroke oil when engine runs?! someone suggested that and now i think it would be good because of RPM and low oil in fuel. anyway, good video as always, thanks for this channel it really is good to see how challenging engineering can be! greetings from Finland!
I can understand the reason you didn't put any fancy shapes onto the cover. But since you have the CNC you might aswell scribe your channel logo into various parts. Doesn't hurt to take pride in your creations. Thank you for the awesome content.
Greetings from Greece ✌🏼
keep on keeping on mate ........ your success on this platform has much too say about "It's not the destination but the journey that counts" 😉
Nice progress. BTW, is there any better lens you can use? The registration depth seems to be wrong and bokeh suffers from cylindrical "astigmatism". Nothing is really in focus. It remings me of trying to fit 2/3" lens on full frame camera. It was relatively sharp in the middle but suffered progressive circular "dullness" further from center.
Welcome to the world of DIY anamorphics.😁
I have followed you for a while and you seem to have forgotten to measure twice and cut once if you even knew about that saying!!! As I say to my children, pay attention!!!
I'm trying😂
the quality of the second rotary valve assembly is awesome , why dont you tap the holes in m7 diameter instead of putting a helicoil?
All the cool boys use m7
That's the tap that's almost never used. And make he's own m7 bolts because it's rarely stocked
The Rotary valves non-functional
For thread inserts, i could recommend Time-Sert inserts, it seems more rigid, as insert is rolled tight as last step, you can get them atleast from wurth. Great videos and great progress.
Please explain how having a valve in your crankcase has anything to do with intake and exhaust flow😂
Are you aware that this engine is a 2 stroke?
I know i have mention brass or oilite for the valve, however i just just remembered seeing a brass bushing , with graphite dowels inside, maybe you could press oilite dowels in the valves wall to keep the valve sliding about a half of .0001" off the wall, reducing the friction!
I sent you a message on patron. Hope all is good buddy
A teeny oiler right at the innermost portion of the valve would probably handle the entire thing. Centrifugal force would spread the oil outward.
Yeah. This will be necessary
@@retiredbore378 as long as there was nothing before it that needed oiling, and that it properly "mixed" into the intake charge, it would probably be OK.
If friction related heat within the rotary valve assembly continues to plague you - perhaps a finned cover could help bend that curve.
Awesome video as usual. Can't wait to see the next one. Hope you have a great day
Hi Alex and everybody else.
Time for me to throw a brick in the bush.
The excessive heat build-up in the area of the bearing/rotary valve drive boss is the problem that we are seeing...
BUT what if the cause of the problem is somewhere else and is manifesting itself in the "hot" area?
Occam's razor is not necessarily always the way to go ESPECIALLY when dealing with (in this case) a highly experimental motor like this one.
I cannot wait for the day that a professional bike racer (is there a 50cc class any more?) to take to the track and give his opinion.
Yes, save yourself milling time, proof of concept does not have to be pretty, or light, just functional.
You don't have enough oil content in your fuel! It's model airplane fuel-and most of these fuel people haven't a clue as to what they're doing. Why trust some clown to mix your fuel? MIX YOUR OWN and know what the oil and percentage really is.
Do you pre-lube the disc with 2stroke before assembling ? Just wondering as I don't remember you showing. Thanks and good luck.
As you have the CNC capability, I don’t understand your not incorporating O-Ring seals in the various case and component faces…
Great job Alex. Have you thought of plating the rotary disc? Or Teflon coating? Anodizing the aluminum surfaces? It might cool the disc a little. I would drill the holes a little bigger then press fit aluminum rods “loctite”into the holes. Tig weld them in. Machine flat. Drill and tap to m6.
Probably too late but you should consider using PTFE lip seals. Much less friction and longer life after break in. They are also much higher temperature.
I like your videos, but be careful angel grinders apply a lot of heat and can, make distorsions ! I loved your early videos, with just handtools !
If you use a smaller tool like .25” or 6-8mm and do a 20% step over you’ll get a smoother and flatter surface vs using a larger endmill.
After you finish all your rough machining on your part you can use double sided tape to make your part parallel when using aluminum. I used to do it all the time. You just have to make really light cuts and turn the coolant off. Hope this helps... Also you have to get the proper tape, I forget the name of it but it's a really thin plastic tape. I will try to find it and post a link...
5:25 , what is that in the background at your left.. ?? Long black hair and a white top..??? 🤣🤣
Started watching on toilet, finished watching on toilet.
Great video, will come again.
Have you tried this new Triboron stuff that is supposed to replace 2t oil? The claims they make are pretty wild but if true you could see a 10% efficiency gain :) not sure if you can get it in Norway yet
I'm wondering why you need those two alloy pieces either side of the disc valve. I understand why you needed them with the CF disc, but I would have thought the steel disc alone has adequate wear resistance sliding on the hex hub?
😈😈😈😈😈 Thats what im talking about ace ... even if its a little fiddily 😈😈😈😈😈
I would love to build something like this my self but don't have the money and tools for it rn
Yes, a lot of us are in the same boat, got the enthusiasm but not the money!
When I used to race in the early 70's those of us without funds built our own bikes from road bikes and worked out of the shed.
Around 3 years ago I purchased a air cooled Piaggio NRG power engine from a breakers yard. The engine had being re built at some time with standard parts. I tuned the engine until it achieved 16200 revs until the piston skirt broke off writing the engine off.
I tuned it using a clone Dremel and perseverance. The engine used standard magneto ignition, cast iron cylinder, twin ring piston and standard low primary compression road crank and metal reed valve petals.
I had done around 3 hours of full power testing running for 10 second power runs with its modified road expansion chamber and 28mm clone carb.
This engine was designed over 20 years ago and very basic at the start. All the work was done in my garden shed.
What do you race?
@@malcrandall1309 i don't race race but i have my generic trigger with 77cc br stage6 in am6 engine crank case and cylinder is my own hand filed, carbon reeds with 28 carb. Top speed with 14-50 sprocet is 147kmh in gps. But i'm going to start building a car so i will propably have to sell my bike. The bike is my profile pic sorry for my bad english
yay! a double fix of 2 stroke mayhem.rounds off my week perfectly.
2 strokes and CNC milling go together like peanut butter and jelly ❤
I hope you finish your engine before I become homeless and unable to watch anymore.
The grooves look like they’ll solve that heating issue, let’s see how it behaves!
I saw a video about an old partner chainsaw that used one of the crankshaft counterweights as the rotary intake valve.
You look a bit down in the last 2 videos...everything ok?
I always get so scared when you say “thats all I have time for today!” But then I see that im only half way thru the video 😅
Are you using any antifreeze in your milling machine? Winter is here!
Off topic but can anyone tell me what ignition he uses and where to get one in the US?
The beat of a different drum, the beat goes on , so beat it, just beat it!
Wow another great one only downside to this channel is the videos are to short 😂
I have a question about putting a diamond on a honing stone, can you show me how to do it?
I have a question about putting a diamond on a honing stone, can you show me how to do it?
NICE, thanks for the update!
What type of drill press is that looks heavy duty?
Do you juse a standaard crank or a special race crank ? My experions whit a more heavy crank is good .
Hello Willem. The crank Alex uses is a special very high performance road crank. It uses a 15 or 20mm longer conrod which have become very rare in Europe since emission controls restricted manufacturers from making them as road going machines.
Heavier cranks take longer to get upto speed and longer to slow down when the throttle is shut. This is ok for a road going engine but not so good for a race engine. With this tiny 50cc engine I feel a lighter crank would rob less power. I also feel crank balance is a major performance factor at such high revs. This engine vibrates a lot!
Fuel frothing has being a major problem in the past caused by vibration leading to fuel starvation.
Bloody hell! You are good! Hats off to you.
too aggressive feed rates
Why are people falling for this that is a stock top end of some two-stroke engine everything it needs to run is already in the cylinder head and jug the so-called rotary valve is only throwing the engine off balance
Everything here is actually designed and made by me, no stock scooter stuff.
Great progress Alex. Two videos in one week too!! This one will be just that much more refined.
Why no assembly grease?
Hopefully you'll get over this rotory valve hump with this modification Alex 👍😁
If you really want to do a definitely-not-safe hold-down during CNC-ing, maybe use a length of wood instead of your fingers? Would a dimple pattern on the inner surface of the valve body work well to reduce friction and hold oil? I think I suggested that during the earlier rotary valve you built.
Welcome to my garage to
I like when you include segments of CAD & CAM, do that more please
Have you thought about getting a youtube knife maker to make the valve? from a piece of tool steel, spring steel or something, have it precisely ground on both sides, and pilished! A surface grinder is going to me more precise than a mill. Just wn idea..
I'm here every time for the "Welcome back to my garage" and the following shenanigans.
Well it took me 3 goes to watch this video but i finally got through it and holy hell that rotary valve looks nice especially being cobbled together in a home garage. It really makes me wonder what you could achieve if you had access to a full machine shop! Awesome video as always cant wait until the next one 👍
Looking good! I was thinking why don't you mount the valve in a fixed position on the crank so it can't float and rub on the cover, at least on the flange side, outer edge will of course rub because of air being sucked in. But that would at least remove the heating from friction.
Good demonstration of time management :) Keeping the family happy..Well done!
aah, one simple part i love about your videos is that i can use my monitor to the full potential, keep exporting ultrawide!
Your inspirational vids keep me moving on my own projects, thanks man.
Nice machining!
Looking good Alex!
Was thinking about your carbon rotating valve. What about a magnesium rotating valve?
Nice one Alex!
Why doesn't anybody realize the so-called rotary valve does nothing for this engine it is completely nonfunctional
No I think it is just you who doesn't know the function
I think I understand why you're making this statement. If your experience with two stroke engines is with the piston ported variety only, it's easy to think a two stroke doesn't need an intake valve.
I’ve been thinking of a way for you to have success with a low budget. There’s not really any answer. Perhaps charity is the only way there has to be some retired engineer from the automotive industry out there in UA-cam Land biting his finger nails every time he watches one of these type of videos. Well, it’s time for you nailbiter to get off your ass and volunteer your time for this young man to have success well, it was worth a try
love the content
14:20 Ummm.. that doesn't sound slick dude. 🥺
Burs on the disc still, and probably some grit on the housing.
Alex ! Why are you working on something that's already done sooo many years ago. And at that time uniflow scavenging was discovered to be the most efficient, and the most reliable as no gas mixture enter the crankcase
Look all japanese European MC manufactures, and all their engineers worked hard on this putting in huge sums of money, and got high output 2 stroke, so 50 years later trying to create something that are superior are very very hard. Some new thinking and approach invention are needed , but extremely difficult to do. Alex are very likable, but he has set himself a impossible job,
@@retiredbore378
One can easily lose one self in these things and waste a lot of time being blinded
Baby steps.
Good work!
T H A N X
nice
cool down the pace ..take a wisky you urn it ...ore 2.....dont blow him up
Question are you still going to be using the mini super charger in the future and if so will this increase the friction when it has boost pressure pushing on it
looking forward to hearing it run
same, even if i just heart it run and video ended.. cannot wait next haha
A few videos back I mentioned the possibility of lateral flutter in the rotary valve, which could explain the heat concentration toward the driver since aero-induced oscillation on the large "lobe" part of the valve would drive the opposing "ring" surface alike, laterally. Perhaps there's zero chance of an aero/fluid dynamics root cause, but if not, I'm holding out hope for a channel to hold the outer edge captive and remedy flutter, hopefully without too much friction losses.
You should have milled the lubricate grooves so the oil is forced in toward center instead of out to the outer edge.
He did
@@Scissors69 yes you are right 👍
Nah
great job solving that issue from the ground up!
Have you tried nickel plating for a friction-less surface?? Also when will the cad files of your cylinder be released?
Nickel huh, I don't think the material is the problem I think it just gets oil starved, My kawasaki has a disc valve and it's a smooth steel disk on the steel casing
@@dietznutz1yep or like my rotax engines which are steel valve with aluminum case.
does it have lubrication to valve, like i heard some rotax engines have?
@@shifty1927
@@shifty1927 exactly, I think it's just not oiled enough
@@dietznutz1 google says hard chrome plating retains oil better but since it's an engine casing and they get crazy hot i feel like he needs to find a two stroke oil that has a higher "smoke point" because with that spinning valve disc i feel like it burns the oil before it gets into the chamber
Why aren´t you putting the crankhouse seal on the lid?
That way you get pressurized lubracation on the disc.
own lubrication to valve is the answer in my opinion, but.. i might be wrong.
😂
Beautiful progress!
Og vi er tilbake! Heja Norge!!!
use M7 bolts
very good
3:55 M7 is also a standard size
The Volkswagen Polo has M11 cylinder head bolts. It is also standard according to my tool guy. I was very surprised how cheap and easy it was to get tools for M11 threads. The cylinder head studs for some BMW boxer engines are M9 on the crankcase side and M8 on the head side... It was also surprisingly easy to get a M9 tap and die.
Maybe the deign is just not going to work maybe use a cam that seals the hole as there is way less friction compared to a large spinning disc.
The design is tried and tested and has been used for decades
@@Scissors69 And yet I don't see anyone doing it today other than his guy.
@@hampopper3150 - To be fair, who else is even building their own engine? If you know anyone, let me know, because I’ll watch them too
@@Scissors69 Not that many people do engine designing and share it to other people outside of their circle. They want to keep it secret to potentially get patents and also out compete other people in races. High performance 50cc racing in unlimited classes is a thing of the past as better teams obviously beat everyone in that race category so they made rules so that everyone has a shot at winning. I like to look around at everything and think about it. VisioRacer explains all kinds of stuff about different engines. The idea for the rotary valve design that I said I saw from eco-marathon racers that try to get the highest mpg possible.
Have you ever thought about developing it for go karts? I think you would have more space to move around
He's to far in itterating cylinder mounted to aprilia carrier engine and not deep enough with development to change chassis
@@Stratos1988 You are absolutely right about this project.
But, being a kart driver, I hope that in the future he will dedicate himself to my sport because they are certainly the most potential 2-stroke in the world (displacement/power ratio)
@@Aledefii I think for now, you'd have better luck swaping some crazy two stroke from jet-ski or snowmobile.
@@Stratos1988 the first answer you gave me made sense, you could have even saved yourself the second answer