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custom pistons

  1. IPS Spec JE Pistons vs JE shelf pistons

    Advanced Engine Theory and Design
    What he have here is a comparison of a custom IPS spec JE pistons designed for endurance racing and a "stock" off the shelf , regular JE piston. The shelf JE piston specs: J.E. 13.1:1 (87mm) weighed 334.5 grams its wristpin weighed 97.9 grams. The IPS spec JE piston (endurance racing...