Originally Posted by lowrider
Or is it an 80 cc motor that we are forced to call 66 here in America due to our forms of measurement ??
Huh??? who are you kidding?
Is that the new math they are teaching in schools these days?
Where there are no wrong answers?
It is very simple math......
However, the bore and stroke of an 80cc being 47x38mm only equals 66cc.
To figure displacement for this example: 47mm bore x 38mm stroke; we use a standard formula to figure an engine’s cc displacement; ( multiply 3.142 x radius of bore mm squared x stroke length mm divided by 1000. )
Bore diameter divided by 2 = 23.5 mm radius
To square radius multiply 23.5mm x 23.5mm = 552.25 radius mm squared
552.25mm x 3.142 = 1735.17mm
1735.17mm x 38mm = 65936 cubic milliliters;
To get cubic centimeter divide 65936 by 1000 = 65.936cc or round off to 66cc.
As a result we see there is no such thing as a 80cc: