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Registered
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,861
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If my memory is correct, the fins on the top of the cylinders are somewhat reduntant. This is because air flows from the top to the bottom, and so directly above the cylinders will be a high-pressure area with very little air flow. If there is no airflow, then there is relatively little transfer of heat from the cylinder to the air. The sides and the bottoms of the cylinder all have airflow over their surfaces, so in those areas the fins do convect heat out to the air.
That's my memory of the situation.
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John
'69 911E
"It's a poor craftsman who blames their tools" -- Unknown
"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman
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