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Old 09-04-2008, 10:09 PM   #4 (permalink)
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WTH? From my limited understanding of combustion dynamics and cylinder head design, those grooves provide two bad things:

a) a quench spot
b) sharp edges which are great sites for unintended flame kernels, ie detonation.

The only positive I can think of are that they increase turbulence/swirl in the combustion chamber, and I am curious to know the explanation.
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