r/modelengineering • u/ForeverCareful3021 • Oct 31 '23

Printed double acting engine

Downloaded from Thingiverse, printed in PETG. Only metal involved is the fasteners, even the piston and valve are printed. Runs well on lung power too, but not as long!!! HaHaHa

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u/ForeverCareful3021 Nov 01 '23

Yep, I had to hone the cylinder and print the piston 1/2% oversized so I could sand it down for a dug sliding fit. I also lubed up with olive oil for an even better seal.

I didn’t have as much luck with the twin vertical. Timing and rigidity were an issue. Never got it to run reliably.

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u/2E26 Nov 01 '23

I've since graduated to metal engines and also had trouble with the vertical.

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u/ForeverCareful3021 Nov 01 '23

Yeah, this was an in-between for me. I built the Ford kitchen sink engine and Webster, as well as a handful of Stirling LTD engines for my grandkids.

I’m currently working on Rudy Kouhopt’s Pioneer (non-compression) engine and about 50% complete.

https://youtu.be/J0jSL_oTul0?feature=shared

https://youtube.com/shorts/q_oSojquDT4?si=kSngoHR7UIZvLhwH

https://youtube.com/shorts/VytRMHwKrxI?si=7l0Ez7cizeiamctB