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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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<blockquote data-quote="Monkeypants" data-source="post: 115516" data-attributes="member: 2708"><p>When I realized my 1360 crank needed a rebalance, preferably dynamic, the possible effect on the interference fit worried me a lot.</p><p>I did some research and found a Harley tuner shop that had worked with Hines to develop a dynamic crank balancer that runs the crank with rods in place. This is a $200,000 machine.</p><p>I almost had them talked into doing my 1360 crank, but in the end they declined making the changes to their machine. They wanted to do it but it made no sense for 1 crank which isn't even a stock Vincent crank.</p><p>So I opted to push one side apart to get the balancing done and the other side to put things back together again, final assembly.</p><p>The interference fit dropped from 14 tons pressure on the take apart to 12 tons on assembly.</p><p>Still plenty I think as new Vincent cranks at factory aimed for 7tons pressure needed for assembly.</p><p>I recall John Mcdougall saying that some of the old ones come apart with hardly a flicker of the needle, maybe half a ton. I guess if it's been rebuilt a few times in 60-70 years it's to be expected.</p><p>All of which makes those new cranks more interesting....</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 115516, member: 2708"] When I realized my 1360 crank needed a rebalance, preferably dynamic, the possible effect on the interference fit worried me a lot. I did some research and found a Harley tuner shop that had worked with Hines to develop a dynamic crank balancer that runs the crank with rods in place. This is a $200,000 machine. I almost had them talked into doing my 1360 crank, but in the end they declined making the changes to their machine. They wanted to do it but it made no sense for 1 crank which isn't even a stock Vincent crank. So I opted to push one side apart to get the balancing done and the other side to put things back together again, final assembly. The interference fit dropped from 14 tons pressure on the take apart to 12 tons on assembly. Still plenty I think as new Vincent cranks at factory aimed for 7tons pressure needed for assembly. I recall John Mcdougall saying that some of the old ones come apart with hardly a flicker of the needle, maybe half a ton. I guess if it's been rebuilt a few times in 60-70 years it's to be expected. All of which makes those new cranks more interesting.... Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crankshaft Balance Method
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