Easiest ever 2 stroke engine compressed air conversion no solenoid or valves
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- Опубликовано: 17 сен 2024
- Easiest ever 2 stroke engine compressed air conversion, This took me 30 mins to set up from scratch, Running a 2 stroke 30cc MTD strimmer petrol engine on compressed air, With just a cam molded onto the flywheel out of "Ceys Super Bar" to open a trigger operated stander air gun at tdc and keep it open until the exhaust port is open. The trigger air gun is connected by a standard rubber air hose to a 1/4" standard air connector which is screwed into the spark plug hole using a rubber washer and the trigger is screwed to a steel plate, the plate is then screwed to the crankcase. The trigger gun then closes after the cam passes it and then air leaves through the exhaust port, the piston comes back up to the top and the cycle starts again. Why others have difficulty with this and use all sorts of complex valves i dont know!
I have been trying to figure out a way to do this with a blowgun, but the ones I have are the different style, so the handle is going the wrong way. Your video reminded me about the other style! Thanks for the inspiration. Great job!
Put that in a go cart man hat would be awesome! :)
Mint well done, Over time the crank will bend as it's unbalanced by your cool cam love the method. Maybe some other way of letting air/oil mix in by a cam on top like 4 strokes.
nice idea as a fun project but to make it usable it would need an oil injection into the air feed hose for lubrication as the engine would seize, Also there would be a high rate of wear on the blow gun trigger.. perhaps a magnetic reed switch triggering on TDC (without physical contact) and pulsing a valve on the air feed?
i got an idea... water tube boiler made useing rocket stove designs and principals, steam goes to one of these things on a large scale, maybe with something similar to push rods, valves and cam shafts to get decent timing [because mechanical methods always whereaver possible and practical], and send the steam under to push the piston back up a bit as it escapes, and the cycle begins again. then, either have that be the engine in a vehicle, OR, add on a electric generator to use the whole thing on the go, maybe in a small tow storage trailer to power an electric car's motor, with some batteries inbetween for imediate starting while the steam generator warms up. likewise use it as a way to power stuff off the grid, just chop wood, or even use it to make its own feul using a wood chipper or pellet maker. then just feed the hopper as needed for constant electricity and heating [cuz the exhaust could act also as a hot water heater]. im thinking maybe a large custom built rocket stove based optimized boiler, exiting steam hooked up to a large 2 stroke multi cylinder engine, send the steam back through a condensor to recycle the water back into the system in a loop. then use the engines output rotational power to drive a pulley string of alternators, which combined have enough power light a home, charge lotsof car batteries, tow on a trailer as a portable charger for an electric car, and if designed compact and light weight enough, maybe even install it inside the vehicle inself in place of where a giant thing of batteries would be that can only get you 40 miles on a budget with a small car and isnt practical for long distance travel or cross country driving. the portable steam generator though that runs on anything the creates sufficient heat is very versatile, thus specific feul is no longer an issue, and useing it as power to generate electricity to power an electric motor eliminates the kinks asociated with building and keeping up consistent steam pressure while under load like the old stanely steamer cars, which while powerful looked kinda awkward to setup and control by todays standards, so just use it as electric generating potential to power or augment an electric car!!
Really simple and easy. Great job!
Thanks, a lot of people who comment on here dont get that this was just to demonstrate how easy it is to do a basic conversion in minutes. Yes you could replace most of the rubber hose with a metal one and put an oil feed in and flywheel on, and while your at it put wings on it and a seat and turn it into a plane! Its just a demo!!!!!
Omg thank you so much i've seen so many vids of this i got it to work on a large engine with actual valves and pushrods but this made my life so much easier because you explained that "you have to put a cam on the flywheel"!!! But where or how do you know whare to put the mold of the cam? just put it on the top stroke of the piston?
looks very efficient too..
thanks...``good o`l common sense ingenuity``...stay creative !!!
Placing the cam on the flywheel seems to work well but I am guessing that it is creating a lot of unbalanced forces the faster it spins. You may consider a second lobe 180 degrees off, but in a place that wouldn't hit the trigger.
same here. unless this is for demenstration only, that is a good idea
Y'know, this is one of those moments that make engineering types like me go, "Well damn, why didn't I think of this?!" I've been mucking about looking at all sorts of valves to try and do a 2-stroke to steam conversion, and a cheap airgun and a lump on the camshaft is all it takes...
Works well on air, any ideas how steam at say 50psi ought to fare? I'm wanting to build a few of these to generate electricity and have a little steam car, for I've tons of old two-strokes lying around.
I fully understand that it's a demo, however what would be a decent application for it? Possible green (eco friendly) way to turn a shaft. Maybe a small boat?
no lubrication.
Yes, you want it to activate the trigger when the piston is at tdc.
post more please!!!!!!!!!!!!!!!
For didactic or low efficiency demanding applications it can be good. But, why you say there's no valves!? The "air trigger" is a valve, and in the way its used it don't take so much time to wear. The air flow or pressure will be according to the volume of the piston and the torque applied. Anyway, this is simple physic, the power output from the motor will be much less than the compressor power.
i would use some strong thin metal instead of putty as putty is quite heavy and can give a big unbalance Did you have any problems with it being unbalance did it vibrate alot or anythin
I dont think you have watched the vid properly! As there is no valve on the piston head! The clue is in the title! The timing is controled by a 5 dollar air trigger pistol and homemade cam on the flywheel, all explained and shown in the vid, so if you dont want to offend people with stupid comments then watch the full video! As this runs on 20psi and a tiny 15ltr compressor!
None of the designs I've seen are really ideal. This one is simple and effective which is great but the length of hose after the valve is going to create more head space reducing pressure acting on the piston.
My bad, So I do have a question, why does it work with the air trigger vs using valves?
What psi is it running at
shouldnt the other side of the flywheel be weighted to make it even?
what minimum pressure is required for it ???
You might want to check out my conversion of a similar string trimmer motor here:
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--this motor has no valving of any kind, it just relies on the different impedances created by the intake and exhaust ports which are properly matched to the higher inlet pressure versus lower exhaust pressure. Note how this motor achieves very high speeds because it doesn't have any valves to operate. It doesn't get any simpler than this, all you have to do is make a fitting for the air line.
Only thing that bothers me about 2 stroke engines being used for steam is lubrication.
yo 50ft hose and u can go around in a circle thanks no load but it runs
but you have to take in to consideration that most things ran by a 2 stroke are to small to carry an air compressor
@Justin Alverez no offense but easy my ass! I bet that thing wont work on a smaller air compressor, trust, me there's more to it than just putting a valve on the piston head and hooking it up to an air compressor. How do I know this?? well I have tried just that and even with it timed, it still did not work because of the kind of compressor we were using. like I said no offense I figured I would give you my opinion since I have tried this
the air is being entered through the spark plug hole. doesn't that defeat the purpose of a 2 stroke? try entering through the carburetor