John Maher Racing Engine Calculator - make light work of calculating your engine's vital statistics.

For example: to determine the chamber volume (head cc) required for a 2110cc engine with a target compression ratio of 9.2:1 and a deck height of 0.045", plug in the following numbers: bore=90.5mm, stroke=82mm, deck height=0.045" and desired compression ratio=9.2:1. Click the 'CC's' button and you'll be given the answer: 57cc.

Engine Item MM Inches Measurement
Engine Bore
Engine Stroke
Deck Height *
Combustion Chamber CC's
Your Compression Ratio is
Number of cylinders
Your Displacement:
Solve for which variable ?

Enter a value in either the mm or inches box.
Click the mouse anywhere outside the box.
The other values will be calculated for you.

millimeter/inch/fraction converter
mm inch fraction