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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lower valve guide removal
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<blockquote data-quote="gwild" data-source="post: 9361" data-attributes="member: 242"><p><strong>Question for materials specialists</strong></p><p></p><p>With help I've been looking at my exhaust valve in detail. The head is slightly bent, and the shank looks as if it has caught on the lower valve guide at some point, so the head got bashed by the piston?.</p><p>I was going to replace the valve guide with some colsibro (copper, nickel and silicon alloy, often used in valve guides), but I have been advised by a restorer of Austin 7s to use cast iron instead. Which should I choose?!</p><p></p><p>I am cautious as his area of expertise have cast iron heads, while the Comet is aluminium. I don't think I should be worried about the expansion coefficients, as cast iron is less than aluminium or brass, but what are the other pros and cons? It doesn't help that I am having trouble finding proper material data sheets for colsibro. I've never heard of cast iron being used as a valve guide for Vincents, but why not? It would require a tighter inteference fit when cold?</p><p></p><p>many thanks,</p><p>Gwilym</p></blockquote><p></p>
[QUOTE="gwild, post: 9361, member: 242"] [b]Question for materials specialists[/b] With help I've been looking at my exhaust valve in detail. The head is slightly bent, and the shank looks as if it has caught on the lower valve guide at some point, so the head got bashed by the piston?. I was going to replace the valve guide with some colsibro (copper, nickel and silicon alloy, often used in valve guides), but I have been advised by a restorer of Austin 7s to use cast iron instead. Which should I choose?! I am cautious as his area of expertise have cast iron heads, while the Comet is aluminium. I don't think I should be worried about the expansion coefficients, as cast iron is less than aluminium or brass, but what are the other pros and cons? It doesn't help that I am having trouble finding proper material data sheets for colsibro. I've never heard of cast iron being used as a valve guide for Vincents, but why not? It would require a tighter inteference fit when cold? many thanks, Gwilym [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lower valve guide removal
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