Scooterotica

as the title says , can anyone tell me the formula to work ot the cc . thanks Steve

steve chapman wrote:as the title says , can anyone tell me the formula to work ot the cc . thanks Steve

I'm sure some clever bugger will explain why I'm wrong but I would have thought that it's Pi R squared times the stroke

eg 3.14 x (33x33) x 58 = 198cc

or

3.14 x (35.5x35.5) x 60 = 237cc

thanks for the reply matey , where are the from , sorry to sound thick

1/2 bore x 1/2 bore x 3.14 x stroke /1000 = cc

here is what I use 66mm piston

[PIx(D²)]/4 x stroke

((3.141x(.066x.066)]/4)) x 0.058

= 0.000198429 or 198.42cc

Pi is always 3.1415926535897932384626433832795..... and so on forever

R is the radius of the piston i.e. a standard 200 piston is 66mm across and so the radius is 33

A standard crank has a stroke of 58mm.

If you want to be super fussy then that will only give you the swept volume as there is a bit of space in the cylinder head but its close enough.

bore x bore x stroke x 0.785 is a basic acu calculation

thanks guys spot on