You need to get your heads cc'ed to measure the chambers, also you would need to measure the deck height to see if the pistons are above or below...........then and only then would be you able to know for sure what your CR is.
If you know all the spec's on your engine build, go to http://www.bigboyzcycles.com/ and use their compression calculator to give you a good idea what your compression should be.
If you take that set up base it on a zero deck and a 85 cc chamber you would have 9.1.1. Again to have a 100% accurate figure you must know head cc volumed and acutal gasket thickness and bore, and piston height at tdc.
08-06-2008, 09:35 PM
