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Combined Piston/Valve

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PaulR:

--- Quote from: gipetto on October 06, 2025, 09:06:48 PM ---I don't think it would work efficiently or at all, because for the piston to return to top dead center it would need to compress air which would react against the power stroke.

--- End quote ---
You may be right about this design but as Kim says and, my recent uniflow engine shows, a small amount of air left in the cylinder can be overcome. We'll soon find out!  ;D

bent:
Quote from: gipetto on October 06, 2025, 01:06:48 PM
I don't think it would work efficiently or at all, because for the piston to return to top dead center it would need to compress air which would react against the power stroke.

It will work as long as there is enough momentum in the flywheel to carry it past the compression resistance.

PaulR:

--- Quote from: bent on October 07, 2025, 07:41:28 PM ---Quote from: gipetto on October 06, 2025, 01:06:48 PM
I don't think it would work efficiently or at all, because for the piston to return to top dead center it would need to compress air which would react against the power stroke.

It will work as long as there is enough momentum in the flywheel to carry it past the compression resistance.

--- End quote ---
...and assuming I can make it well enough  :Lol: I've already planned to make the flywheel a bit bigger than the last couple of engines to help with compression.

Opinion seems to be divided on whether this design will work, which suits me as I'm guaranteed to please at least half the people whatever the outcome  :lolb:

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