Quote:
Originally Posted by jamesjedi
Four valves? Perhaps it is liquid cooled?
Not sure how they keep it cool.
I think the 935 had liquid cooled heads?
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Exactly! Putting 4 valves in removes the area that can be used for cooling fins which is why they started with water cooling for just the heads as the development of the 911 motor progressed.
More HP means more heat. + Heat builds in the heads. + Whole top of the cylinder head has limited cooling = Aluminum puddle in your top end.
Where did they change the formula that Porsche didn't see?
They mention dual oil circuits and my only guess is an oil circuit just for getting heat out of the head? It could work but oil is not the most efficient way of transporting and dispersing heat.
(
Water is actually shockingly efficient at heat storage and it is easy to transfer heat to and from water.)