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Old 11-29-2010, 12:07 PM   #32 (permalink)
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47% efficient engine? Really? I thought the Prius gen 3 Atkinson cycle had the highest efficiency at ~38%; which is virtually the same as the Revetec at 38.6%?

The physical geometry of a typical crankshaft engine used in an internal combustion engine had major problems, because of the timing of the fuel burn vs the crankshaft and connecting rod position.

Piston/connecting rod/crankshafts were invented for steam engines, and the work well there, because the pressure in the piston can be maintained from TDC all the way to BDC. If you could burn the fuel outside of the cylinder and build up a reservoir of pressure, then that would be great.

Honda has offset the crankshaft center somewhat (does anybody know the specific dimensions?) but this works against you in the compression stroke, because you lose the mechanical torque on the "other" side of the crankshaft.

The design I am proposing has no compression stroke, so if this works, it would greatly reduce many of the internal losses; while keeping the simplicity of a crankshaft. The Revetec design shows the advantage of the better mechanical torque, but still suffers from the pumping losses, valvetrain friction, etc.
Sincerely, Neil
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