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Dirt Bike Mods & Maintenance
Crank Balancing, the right way
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[QUOTE="cujet, post: 1472070, member: 19501"] For those who don't know, a single cylinder engine has reciprocating mass, in the piston+rings, pin and rod. We could add an equivalent balance weight at 180 degrees to the crankpin. A 100% balance factor. But what happens is that weight has little to oppose it, when the crankpin is at the 90 and 270 degree positions. Leading to an engine that has no vertical vibration, but massive horizontal vibration. This is no better than an engine without a crankshaft balance weight. The 53% balance factor (53% of the reciprocating mass) is an attempt at matching real world vertical vibration and horizontal vibration. It's just a starting point. Real world data will "adjust" the counterweight mass and position slightly from the starting point. I have an ACES 20-20 and an ACES Cobra, helicopter balancing setup. It includes sophisticated sensors and a calibrated output that provides a real time depiction of the balance situation. It's not unusual for single cylinder engines to have more vertical vibration than horizontal. Due to insufficient counterweights. Anyone who tells you that a single cylinder engine can be balanced to something better than equal levels of vibration up/down and fore/aft is incorrect. A well configured, non counterbalanced single will always have vibration commensurate with it's reciprocating mass. It can never be perfectly smooth. Unless.... the single cylinder uses 2 counter-rotating crankshafts. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Crank Balancing, the right way
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