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 - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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