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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve heights in head
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<blockquote data-quote="timetraveller" data-source="post: 44818" data-attributes="member: 456"><p>I dont have a measurement but the 30 degree angled valve seat normally needs to have the ground portion extending outwards towards the outer edge of the valve seats by well over half the radial thickness of the valve seat. If they have only been ground to a thin edge they are not gound down far enough. The exhausts should have seat to valve head contact width of about one tenth of an inch to enable heat to pass out of the valve head into the seat. The inlet can be as thin as you like consistent with a good seal and then the inner edge of the seat ground back to aid gas flow. As an aside many racers use a 45 degree angle on the exhaust. As another aside Terry Prince sells valve springs that will allow up to about half an inch of lift without binding but yet give a standard seat pressure.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 44818, member: 456"] I dont have a measurement but the 30 degree angled valve seat normally needs to have the ground portion extending outwards towards the outer edge of the valve seats by well over half the radial thickness of the valve seat. If they have only been ground to a thin edge they are not gound down far enough. The exhausts should have seat to valve head contact width of about one tenth of an inch to enable heat to pass out of the valve head into the seat. The inlet can be as thin as you like consistent with a good seal and then the inner edge of the seat ground back to aid gas flow. As an aside many racers use a 45 degree angle on the exhaust. As another aside Terry Prince sells valve springs that will allow up to about half an inch of lift without binding but yet give a standard seat pressure. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve heights in head
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