Compression Calculator
Instructions: Enter a value in the un-shaded boxes below as they pertain to your engine.
Note: For pistons BELOW the block @ TDC - value in box must be a POSITIVE number (.000)
Note: For pistons ABOVE the block @ TDC - value in box must be a NEGATIVE number (-.000)
Note: For a DISH piston - value in box must be a POSITIVE number (0.0)
Note: For a DOME piston - value in box must be a NEGATIVE number (-0.0)
Note: Manipulate the DOME/DISH & PISTON to DECK volumes to get the ratio you want.
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Enter the number of cylinders of your engine
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| Bore |
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Finished bore of your engine |
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| Stroke |
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Stroke of your engines crankshaft |
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| Rod Length |
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Ctr. to Ctr. length of your connecting rods |
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| Gasket Bore |
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Head Gasket bore diameter |
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| Comp. Gasket |
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Compressed Head Gasket thickness |
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| Block Deck Height |
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Center of main bearing bore to top of block |
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| Top Ring Down |
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Top of 1st ring to top of pistons (FLAT) |
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| Chamber Volume |
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Cylinder Head chamber volume in CC's |
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| Dome/Dish Volume |
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DOME (-) or DISH (+) vol. (theoretical) in CC's |
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| Piston to Deck |
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Top of BLOCK to top of piston (FLAT) @ TDC |
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Click "Calculate"
for dimension results.
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| Total Volume |
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| Cylinder Volume |
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Total cylinder volume in CC's =
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| Clearance Volume |
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All effective vol. above block deck @ TDC in CC's =
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| Gasket Volume |
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Volume of your head gasket in CC's =
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| Top Ring Volume |
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Total volume above the top ring @ TDC in CC's =
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| Deck Volume |
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Volume of area above the pistons @ TDC in CC's =
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| Piston Top Land |
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Piston top land diameter for volume calculations =
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| 1/2 Stroke |
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1/2 stroke of your engine's crankshaft in inches =
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| Compression Ht. |
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Ctr. of piston pin to top of piston (FLAT) in inches =
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| Cubic Inches |
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Cubic inch displacement of your engine =
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For the
given dimensions, your compression ratio =
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