Big Boyz Head Porting - Twin Cam Compression and Displacement Calculator



Twin-Cam Compression and Engine Displacement Calculator


Choose Engine Size�
				Use for custom configuration or oversize bore.� Leave at 0.000 to use default values OR change any value to override default.
STD Bore�	Alternate Bore�

Stroke�	Alternate Stroke�

Rod Length�	Alt Rod Length�

Head Gasket Thickness�	�inches	Stock=.045, Cometic MLS �.030� or �.040

Head Gasket Bore�	�inches	Stock 88, 96=3.850, 95, 98, 103 and 107=3.950

Cylinder Head Volume�	�CC's	Your measured volume should be entered here

Deck Height Front Cyl�	�inches	Negative number if piston�
Deck Height Rear Cyl�	�inches	is ABOVE cylinder

Optional Piston Diameter�	�inches	Measure above top ring**
		** Leave Both at Zero OR enter BOTH values
Optional Top Ring Land�	�inches	Distance from piston crown to top ring**

Piston Dome Volume�	�CC's	Stock & Flat tops=-1.0 to -1.5 **
		10.25:1 SE Cast 95=10.5 to 11.0 **
		10.5:1 Forged 95=11.5 to 13.0 **
Static Compression	:1			** Total volume for 1
				piston, not both
Engine Displacement	ci
	cc

Corrected Compression�

			�Cam Offset Degrees **
OR		�**Applies to both chosen or entered value
** Enter Intake Close ABDC�
** (Set to ZERO if using a Selected Cam)
				Convenience Calculator
Altitude Correction�			From�
Feet Above Sea Level�			To�

Corrected Compression	:1
�Cold Cranking Compression


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.