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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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<blockquote data-quote="greg brillus" data-source="post: 115493" data-attributes="member: 597"><p>The problem is that on a lot of engines the cranks have come out of race engines and/or used in bikes with completely different frames, perhaps even out of cars like a Cooper or similar. This is where you are taking a complete gamble using the crank. It does take some concentration to get a crank set up........even having any residual oil in the big end can stop the crank rotating "Freely" on the jig. I've known some guy's who only use one rod to balance the crank, suspending the other one with a length of string. I use both rods, that way you treat the assembly like a "Big single" Bill mentions about weighing the rod twice, well you generally weight it on it's own, then with the piston assembly........The variations in figures you get on digital scales is a bit mind numbing, you end up with a different figure every time. Arriving at a balance factor is not too difficult, it is working out how much material to remove that is another.........But as Chris pointed out, you just use lengths of steel rod or similar to work out what is required. Cut pieces up and weigh them..........Once you have done it you look back and see it is not that hard.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 115493, member: 597"] The problem is that on a lot of engines the cranks have come out of race engines and/or used in bikes with completely different frames, perhaps even out of cars like a Cooper or similar. This is where you are taking a complete gamble using the crank. It does take some concentration to get a crank set up........even having any residual oil in the big end can stop the crank rotating "Freely" on the jig. I've known some guy's who only use one rod to balance the crank, suspending the other one with a length of string. I use both rods, that way you treat the assembly like a "Big single" Bill mentions about weighing the rod twice, well you generally weight it on it's own, then with the piston assembly........The variations in figures you get on digital scales is a bit mind numbing, you end up with a different figure every time. Arriving at a balance factor is not too difficult, it is working out how much material to remove that is another.........But as Chris pointed out, you just use lengths of steel rod or similar to work out what is required. Cut pieces up and weigh them..........Once you have done it you look back and see it is not that hard. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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