What is the significance of diesel engine compression ratio in a cogeneration context? I have heard that with cogeneration, the higher the compression ratio the better. Can anyone tell me why? Is it because a higher compression ratio means more heat? And how high is "high" for readily available engines? I think my source said something to the effect that Cummins has some engines with relatively high compression ratios, beyond 20:1. Also, how easy is it to increase an engine's compression ratio? I seems to me that one could damage one's engine trying, if one was careless.
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