How to Calculate CC's?

[Rastus]

If you want to calculate how many CC's you quad has, do you jsut multiply the bore and stroke? Or is it more complicated?

I have to know this b/c im going to be working on a guys wheeler, and his oil ring discenagrated.I jsut need to know how to claculate it b/c im not sure if it was bored or not, and the owner has no idea either. Thanks.

[400exRacerX]

http://www.bluetraxx.com/engine_displacement.htm

[Rastus]

Thanks for the URL.

i will tell you this, when i had my 250x, i calculated what it would be if i bored it .80 over and i think it came out to be a 256x, just trying to hellp.

[Rastus]

Im not doing it for mine, although it would be neat.Im doing it for a 230 quadsport too see if its on the stock bore,etc.
This old quadsport this guy has , has to be the worst looking quad ive ever seen.Trust me, you can't imagine how bad it is.

[MXQUAD294]

According to the AMA rule book, the proper formula for calculating dispalcement is as follows:

bore X bore X .7854 X stroke X # of cylinders

For example: the Z400 has a bore of 90mm & a stroke of 62.6mm

90 X 90 X .7854 X 62.6 X 1 = 398cc (divide the actual number by 1000)

[Nausty]

I thought they did it like: pie(3.16) x bore x stroke

[tayz34]

when you say bored over .2 or what ever it may be is that millimeters or what . i was just wondering when we talk about calculating by using bore and stroke and stuff.