Calculating compression ratio on a rotary- How?
 

As title really.
On a piston engine I know how, and once again it will be partly to do with measuring the dish volume, but how do I know what dish volume equates to what?

Does anyone have the dish volumes for the various standard compression ratios? Should be able to work out most ratios from there to be honest.

I have S4 and S5 rotors here, plus FD ones, but tbh that doesnt help me that much.

If anyone can give any info on this it would be greatly appreciated :icon_tup:

Clearance volume = CompressionRatio-1/CompressionRatio

10.0:1 rotors are ~28cc tubs
9.7:1 rotors are ~30cc tubs
9.0:1 rotors are ~37cc tubs

All other rotor compression ratios are shit inaccurate ;)