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The guys here will correct me if I'm wrong, but I think it's not that aluminum lowers compression, but more like you can run more compression with aluminum than an iron head without detonation, all things being equal.
It seems that they dissperse the heat a lot faster than the iron,wich means that they would evite detonation on a 10:1 and upper CR,but i don,t know what would happen with the power on an engine with less than 10:1.
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Coke , with pistons that deep in the hole you'll have no issues with piston to valve interference. but you'll want to be careful with compression being too high without the benefit of quench because of how deep they are in the hole.
John,
Do you mean that the compression could damage the gasket triying to scape ?That is the explanation that i find,cause the quench is the flat part of the piston wich leves with the block surface,but this would be on a dish piston,six pack style for example.
However 9.3 or 9.5:1 CR wouldn,t be a trouble,would it?
Thanks both of you
Last edited by Coke; 02/09/12 08:50 AM.
