This calculator provides the new clearance volume and the new compression ratio of the engine based on changes made. Changes can include a reduction in the gasket thickness or decking of heads or block.

variabledescription
borethe bore diameter of the engine
strokethe stroke length of the piston
compression ratiothe compression ratio of the engine
cylindersthe total number of cylinders
changechange in deck, head or gasket, expressed as +ve when added (ie thicker gasket) or -ve when material removed (ie block decked or thinner gasket)
cubic inchesthe total cubic inches of displacement
old clearance volumethe original clearance volume per piston
new clearance volumethe new clearance volume per piston
new compressionthe new compression ratio
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