VW GTI Compression Ratio Calculator
Calculate static and trapped compression ratio, displacement, chamber
volume, and the effects of head milling or a spacer.
Input notes
-
Values may contain arithmetic expressions. For example,
80.5 + Inch(0.020). -
Connecting-rod length and intake closing angle are used to calculate
trapped compression ratio. -
Piston clearance and top-ring height calculate the volume above the
top ring and below the piston crown. -
Enter piston-dish volume as a negative number for a domed piston.
Use a negative deck-height value when the piston protrudes above the
block deck. -
Spacer thickness is the change from the entered gasket/head position,
not necessarily the spacer’s full physical thickness.
Calculator logic derived from Eric Fahlgren’s Compression Ratio
Calculator, copyright 2003.
