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Old 03-16-2009, 03:46 PM   #107
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Joined: Dec 2006
Location: London
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Tight squish/Fast burn

The cooler running higher compression engines may be related to tighter squish clearances between the piston and head surfaces. This leads to more efficient combustion and lower cylinder temps.

I don't know any specifics with regard to the Airhead engines, but it makes sense and it would be worth looking into. Someone with more knowledge than me may be able to chime in with better than my rudimentary explanation .
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