Quote:
Originally Posted by 99kleansi
Anyone care to argue that an aluminum performance cylinder head is less efficient then an old iron head?
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I'll try, It's my understanding that if you view an internal combustion engine in terms of thermal efficency that a cast iron head is better at keeping heat in the combustion chamber (like thermal coatings on pistions). Aluminum heads lose more heat and allow a higher compression ratio with the same octane fuel. Increasing compression increases combustion efficency and creating a greater expansion on the power stroke creating thermal efficency through more heat extraction on the power stroke. I think either can be an advantage depending how the engine is built.