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Twin-Cam Compression and Engine
Displacement Calculator
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Bore
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inches
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Stock 88 or 96=3.750, Big Bore 95 or 103=3.875
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Big Bore 98 or 107=3.938
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Stroke
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inches
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Stock 88, 95 or 98=4.000, 96, 103 or 107=4.375
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Rod Length
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inches
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Stock=7.667
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Head Gasket Thickness
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inches
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Stock=.045, Cometic MLS .030 or .040
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Head Gasket Bore
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inches
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Stock 88, 96=3.850, 95, 98, 103 and 107=3.950
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Cylinder Head Volume
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CC's
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Your measured volume
should be entered here
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Deck Height Front Cyl
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inches
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Negative number
if piston
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Rear Cyl
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inches
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is ABOVE cylinder
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Optional Piston Diameter
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inches
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Measure above top ring**
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** Leave Both at Zero OR enter
BOTH values
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Optional Top Ring Land
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inches
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Distance from piston
crown to top ring**
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Cylinder Expansion
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inches
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.020 to .040 is generally
accepted for a Harley
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Piston Dome Volume
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CC's
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88, 95, 96 and Wiseco 95=-1.500 **
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103 and KB flat-tops=-1.000 **
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COLD Compression (Static)
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10.25:1 SE Cast 95=8.000 **
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**Total volume for 1 piston, not both
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HOT Compression (Static)
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10.5:1 Wiseco=10.600
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CI Engine Displacement
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CC Engine Displacement
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Corrected Compression
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Convenience
Calculator
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From
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OR
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** Enter Intake Close ABDC
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To
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** (Set to ZERO if using a
Selected Cam)
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Cold Corrected Compression
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Hot Corrected Compression
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Cold Cranking Compression
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Altitude Correction
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Feet above Sea Level
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Cold Cranking
Compression
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38.0000
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Values in RED are approximate. Use
actual measured values only. This
calculator is supplied as a convenience and intended to be used for estimates
only. We make no warranties, implied
or expressed, to the accuracy of any data or calculations presented here.
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