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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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