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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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Cosworth Pistons
Cosworth is a good piston.Just not in a Porsche engine.Look at the 69S Piston at 9.9 to 1.All Cosworths look the same.They make compression but by the time the air has to rise over the crown the motor is slow to get to redline.These motors are air pumps.Steve is right about the skirt wear being increased by incororrect rod angle.On my SS 2.8 i use a rod length that is 132mm on a 66mm stroke.Like 2 to 1.BMW has always had a longer ratio which leads to better midrange torque.Ciao Fred
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