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I don't see that working- the pistons coming out of the cylinder and then staying perfectly co-axial until they mate again. The gear backlash and such would require cylinder walll clearance that could not be taken up with a piston ring, since you need a ring compressor to get a piston+rings into a cylinder. The large clearance then means low efficiency due to blowby. Then there is lots of wingage losses unless you have a big pump to evacuate the crankcase, in which case that pump creates parasitic losses.
Piston engines are not perfect but they sure are a great compromise in many ways. The OPOC engine seems like a better idea to me. Rotaries had advantages and disadvantages. Same for turbines.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
Last edited by Flieger; 02-06-2012 at 05:20 PM..
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