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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
hard valve seats
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<blockquote data-quote="timetraveller" data-source="post: 119594" data-attributes="member: 456"><p>Thanks Bill, so my remembered figure was not too far out which raises an interesting point. Vincents were not originally known for having valve seats fall out but one of the local owners bought a new cylinder head a few years ago and had the inlet valve seat fall out within very few miles. This was replaced and then it happened again. A few years later the exhaust seat fell out. We wondered at the time whether the aluminium for the cylinder heads was not being heat treated properly. Valve seat materials have had to change a lot since the introduction of lead free seats and I am no longer sure what the expansion coefficients of modern seat materials are. Perhaps Vic, or someone else, with access to modern material specifications would like to comment about what the interference fit should be with modern materials.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 119594, member: 456"] Thanks Bill, so my remembered figure was not too far out which raises an interesting point. Vincents were not originally known for having valve seats fall out but one of the local owners bought a new cylinder head a few years ago and had the inlet valve seat fall out within very few miles. This was replaced and then it happened again. A few years later the exhaust seat fell out. We wondered at the time whether the aluminium for the cylinder heads was not being heat treated properly. Valve seat materials have had to change a lot since the introduction of lead free seats and I am no longer sure what the expansion coefficients of modern seat materials are. Perhaps Vic, or someone else, with access to modern material specifications would like to comment about what the interference fit should be with modern materials. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
hard valve seats
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