Compressed Air Piston Engine V3 (3D Printed)

This is my 3rd attempt at making a compressed air engine. This time I've implemented a sort-of exhaust valve, improved the strength of the engine and increased the running duration!

There's still more I need to do to improve this engine, I still don't think that it is strong enough, so I may use PETG for some of the parts next time to see if this helps.

Also it would probably be good to see the engine actually power something....so let me know any ideas you have in the comments below!

[_bluespider]

If you want to save the holy dollars, buy metal bearing, open the protection thingy and remove the greace inside (leave them in diesel I found that's what works best) then use silicon base lubricant. Cheap and less friction than with the greace, and fine for small load and not dirty environment. Nice video, keep on the good work

[adammortimer]

Clever use of the pushrod to create an "exhaust valve", always interested when a new engine video drops

[BrasssMunky]

Just posting here to boost engagement and all that

Keep doing what you're doing man, this is great, and the production + the content is really top notch. Love it.

[LukeWasSpotted]

You, my friend have just earned another subscription, how do you only have 750 subscribers?!

[Nib]

the video quality is actually really great, I hope you keep making videos, you def deserve more attention!

[yanikivanov]

your valve idea is great ...thank you for this kind of invention

[garbageman]

I modified a Tom Stanton v3 air motor for maximum performance by adding bigger exhaust ports, 30% bigger inlet valve, and lots of fine tuning for the best seals but it still wasn't hitting as high rpm at the same pressure (when you had the large inlet valve) so the exhaust port on top rather than at bdt seems really efficient. Good job!

[pauldawson]

Another class video bud, keep up the good work I can see your channel going places 👏

[dimitriskalpakidis]

Use a resin printer and instead of a bottle use a CO2 cartridge. Nice video btw!

[TSGPL]

so i havent watched the video yet but i can already tell its gonna be good!



you now have one more subscriber

[onlinehelper]

To boost the engine performance, make a pushrod open a inlet port a bit earlier than piston reaches top dead center.
On that way air will, to say it like that, , punch"the piston with bigger force making the engine has more power.

[BirdbrainEngineer]

Try replacing the push-rod part of the valve design with a ~2mm hardened wire (or a screw with threads sanded off/only a smooth shank part). You should be able to work to an even tighter tolerance and the area of leakage around the rod is smaller (thus of course, less air leaking out during intake).

[AxelDayton]

Really cool bro, instead of using a pushrod system, what if you used a reservoir based valve system like the one tom stanton used? My newest engine was a 2.2cc cylinder with a 2cc reservoir. I used a square piston and I got a 11 second run at 40psi.

However if you wanted to keep with the pushrod system, what if you delayed the pushrod by 60* and decreased the travel? Then you would allow the air to flow in when the piston is already traveling downwards, and with the decreased pushrod travel, you'd let less air in the cylinder. Making it more efficient. But you'd get lower RPMs due to less air driving the piston.

[realflow]

Definitely get some kind of air psi/pressure regulator (not just a simple valve) to control the air going into the engine it will last much longer duration at lower rpm
You could theoretically pump a small metal tank up to a really high psi and regulate it down to 20 psi and get a very very long runtime off it!
note most 2 liter soda bottles can handle just under 100 psi on average. from what ive seen.

[Matthews_Media]

You can also increase the wall count to something like 10 (It wont really be that high but it will make sure the part is printed with walls only). In my opinion this will pack the layers closer together than even 100% infill would

[karyjas]

Wanna try to recycle some of the exhaust air with a turbine attached to the crankshaft? It would also benefit from any leaks from the exhaust port.

[awesomecronk]

Hey instead of raising the infill percentage, try increasing the wall count to improve airtightness.

[FoxTizzo-xqxu]

That's excellent! I would like to know the efficiency of your engine, but this might be difficult to measure (the power output is difficult to measure, not the power input). Especially the version with the little valve is more effective, because it allows the air to expand more inside of the chamber.

[__-fmqv]

This is 2 years late but it would be more efficient to reduce the amount of time the inlet spends open rather than restrict the diameter of the inlet. Both will make it run for longer but the restricted opening also effectively restricts the operating pressure of the engine. Whereas if the time is restricted instead of the inlet size you have an operating pressure closer to the bottle pressure and it gives more to expand in the cylinder and produce work.

[MBrand]

You should use lubrecation to have less friction and it is more efficient because between zylinder wall and piston there isn´t escaping so much air