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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,575
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Henry wrote: “The aluminum fins will help pull the heat created by additional hp form the head. Laws of thermal dynamic tell us the heat travels from iron to aluminum not vise versa.”
That is flat wrong. The engineering field of heat transfer has established that heat always moves from higher temperature materials to lower temperature (in thermodynamic lexicon, from a higher temperature reservoir to a lower temperature reservoir). Material type does NOT affect the direction of heat transfer, only the rate.
The reason for aluminum fins on Biral cylinders is to conduct heat more quickly away from the hotter cylinders to the air flow, because aluminum has a higher K value than iron—i.e., it is more conductive. That provides a higher rate of heat transfer.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 09-09-2025 at 11:51 AM..
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