My Zilla VS Yamaharideronly's 03 Raptor
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My Zilla VS Yamaharideronly's 03 Raptor
Originally posted by: kdog
how do you calculate ? my bore is stock 67mm my stroke is 70mm I bored it over by .090 or the size of piston I used was 69.25mm I am gettin weird number if i times Bore against stroke4,847.50 ???
K-dog
how do you calculate ? my bore is stock 67mm my stroke is 70mm I bored it over by .090 or the size of piston I used was 69.25mm I am gettin weird number if i times Bore against stroke4,847.50 ???
K-dog
What you take is .09*25.4 = 2.286 + 67 (stock bore) = 69.286mm.
Then calc the area Pi x d² / 4 = 3.14159 x 4800.55 / 4 = 3770
Then your displacement is 3770mm² x 70mm = 264923mm cube, divide that by 1000 to bring it to CC's and you have 265cc.
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