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General Chat (Vincent Related)
Greg Brillus Racer
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<blockquote data-quote="timetraveller" data-source="post: 54345" data-attributes="member: 456"><p>With regards to valves and valve seat angles; I have just had a chat with Roy Robertson who races a 90 x 100 Egli over here, 1272 ccs. He gets 94 BHP at the rear wheel and has tried 30 degree and 45 degree inlet and exhaust valves etc. He found no significant difference and went back to 30 degree angles on both. He uses an exhaust valve head diameter which is one eighth of an inch smaller than standard and a 1.9" diameter inlet, that is about one tenth of an inch larger than standard. I have also seen inside Godet heads, but not measured, and there is a noticeable difference between the inlet and exhaust valve head diameters. Patrick does all his development commercially so we could not expect him to divulge what he had done in his latest two 500 cc racers, but Roy was racing at a recent meeting when at least one of them was there and he tells me that it was going very well. Really nice to see what you are doing Greg.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 54345, member: 456"] With regards to valves and valve seat angles; I have just had a chat with Roy Robertson who races a 90 x 100 Egli over here, 1272 ccs. He gets 94 BHP at the rear wheel and has tried 30 degree and 45 degree inlet and exhaust valves etc. He found no significant difference and went back to 30 degree angles on both. He uses an exhaust valve head diameter which is one eighth of an inch smaller than standard and a 1.9" diameter inlet, that is about one tenth of an inch larger than standard. I have also seen inside Godet heads, but not measured, and there is a noticeable difference between the inlet and exhaust valve head diameters. Patrick does all his development commercially so we could not expect him to divulge what he had done in his latest two 500 cc racers, but Roy was racing at a recent meeting when at least one of them was there and he tells me that it was going very well. Really nice to see what you are doing Greg. [/QUOTE]
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Greg Brillus Racer
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