Quote: These are the numbers used for calculating compression: Bore is 4.36, stroke is 3.75, deck heighth of piston is 0, gasket is .040, combustion chamber is 75CC, piston dome is 21CC. Maybe someone can check the math--it wouldn't be the first mistake I've made!
I calculate the same CR, ~15.3 assuming zero deck. But if the CH of the piston isn't perfectly matched to the deck height, the CR is still likely over 14.0. i.e. 0.027 below the deck (not including dome) for aluminum rods (piston to head) gives 14.1 CR
