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Tech. Advice: Series 'A' 500cc/1000cc Bikes
"A" twin balance factor
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<blockquote data-quote="Magnetoman" data-source="post: 88157" data-attributes="member: 2806"><p>You were lucky.</p><p></p><p>I've mentioned elsewhere that I'm rebuilding a 1928 Ariel to use in next year's 4000-mile Cannonball cross-U.S. ride. For that ordeal I want to balance the engine for an aftermarket piston so I need to know the original balance factor in order to do this (it has a worn non-original piston in it now). My premise is that the Ariel factory likely did more testing than I'm prepared to do in order to arrive at whatever balance factor they settled on for the frame it's in.</p><p></p><p>After a few months of searching I was lucky enough to find someone -- in Australia, by the way -- who had an original piston and rings so he was able to give me the weight. Once I have the crankshaft out I'll be able to use that information to determine the original balance factor and that will let me know by how much I have to alter the flywheels for the new piston.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 88157, member: 2806"] You were lucky. I've mentioned elsewhere that I'm rebuilding a 1928 Ariel to use in next year's 4000-mile Cannonball cross-U.S. ride. For that ordeal I want to balance the engine for an aftermarket piston so I need to know the original balance factor in order to do this (it has a worn non-original piston in it now). My premise is that the Ariel factory likely did more testing than I'm prepared to do in order to arrive at whatever balance factor they settled on for the frame it's in. After a few months of searching I was lucky enough to find someone -- in Australia, by the way -- who had an original piston and rings so he was able to give me the weight. Once I have the crankshaft out I'll be able to use that information to determine the original balance factor and that will let me know by how much I have to alter the flywheels for the new piston. [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
"A" twin balance factor
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