Because of the reciprocating motion of the pistons, aluminum can be a big advantage over steel/iron. Aluminum is about 1/3 the weight of steel. Less stress on the connecting rods, wrist pins, crankshaft, bearings, etc. For a high performance engine at high RPM's, all the better. Better efficiency (more energy devoted to turning the crankshaft instead of reversing the motion of a heavy steel piston), thereby higher gas mileage.
As long as the parts are properly engineered, they're a good idea.
Dave Evans
52_3100
Last edited by 52_3100; 06/16/2012 2:31 PM.
