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1outlaw

Interesting study link to Ford's work with E30

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Billy made an important observation- the static compression is always published but what is truly of importance is the dynamic compression. The static is basically the amount the air would be "squished" if the intake and exhaust valves were closed for the compression stroke. Dynamic takes in account the bleed off of air from late closing of intake valves and is determined by static compression and valve timing- this explains it better than I;

 

http://cochise.uia.net/pkelley2/DynamicCR.html

 

Too much dynamic compression will certainly cause detonation far sooner with any pump grade type gas than E85 which loves compression. Also true for cylinder pressure or crank pressures.

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