Higher Compression ratio does not improve efficiency. A higher expansion ratio increases efficiency. That is why a LP turbine is placed after a high pressure turbine. And why reciprocating steam engines used compound cylinders. Higher compression requires more energy on the compression stroke than a low compression ratio.High compression also also imputes more heat= higher temps in the air/fuel mixture prior to ignition. Also more heat wasted into the water jackets.Variable cam timing and some other tweaks get the gasser expansion ratio higher than the compression ratio.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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