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Porsches and all of the air cooled aircraft engines I've seen have aluminum cylinders. On Porsches they have a silica/aluminum coating on the cylinder bore to prevent wear. We run about 12 qts of oil and it is mostly oil cooling that keeps the engines together. Normal head temps are above 380F (Thats where the head temp sensor maxes out after a couple of minutes running). ~320 RWHp out of a 3.8L 12:1 CR Air cooled flat six. There is more to be had and we are working on finding it.
Thanks for this forum so I can learn to find ways to go faster.
Thad
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