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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Crankcase volume effects on power
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[QUOTE="EricGorr, post: 699597, member: 19611"] Crankcase volume and primary compression ratios are quite the conundrum, fills with opinion and theory. Look at the difference between a YZ125 and a KTM125. The YZ volume is relatively low and some tuners think that has advantages in transient throttle response. Whereas the KTM is a totally different story with a cavernous crankcase with a distintive sheilding around the flyweights of the crank, possibly to reduce the effects of windage or turbulence. So one might conclude that greater volume helps top end powerbands. If you do the obvious rounding of the sharp edges in the cases and smooth the transition from the reed box to the case transfers, I think that would be a good thing. Perhaps Fastwes is reading this, he has a lot of experience with CR engines used in karts and dirt bikes, perhaps he's found some concrete rules on case volume for shifters. [/QUOTE]
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Crankcase volume effects on power
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