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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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<blockquote data-quote="ClassicBiker" data-source="post: 97723" data-attributes="member: 1632"><p>Well a 2" diameter by 12" long piece of 7075 at $48 is higher than the 2024 by $4. But you are correct strength has nothing to do with bearing qualities. Bronze used in bearing is 80+% copper. I suspect that the 3.8 - 4.9 % copper in the 2024 had something to do with it being chosen. </p><p>Now actually making an aluminum retainer with a bronze insert is probably the best choice, but I suspect at the time the bikes were in production manufacturing and material cost were factors as well.</p><p>I like the idea of pressing in a bronze guide in to the aluminum retainer. What was the O.D. of the bronze and did you increase the O.D. of the portion of the retainer that extends and direct supports the valve stem?</p><p>Steven</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 97723, member: 1632"] Well a 2" diameter by 12" long piece of 7075 at $48 is higher than the 2024 by $4. But you are correct strength has nothing to do with bearing qualities. Bronze used in bearing is 80+% copper. I suspect that the 3.8 - 4.9 % copper in the 2024 had something to do with it being chosen. Now actually making an aluminum retainer with a bronze insert is probably the best choice, but I suspect at the time the bikes were in production manufacturing and material cost were factors as well. I like the idea of pressing in a bronze guide in to the aluminum retainer. What was the O.D. of the bronze and did you increase the O.D. of the portion of the retainer that extends and direct supports the valve stem? Steven [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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