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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Looking for drawings of BCD intake and exhaust valves
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<blockquote data-quote="timetraveller" data-source="post: 31486" data-attributes="member: 456"><p>My advice is not to make the valves like the original ones anyway. Valve design has moved on in 60+ years and you will find that the modern valves do not have the same shape as the originals. The radius of the curve at the rear of the valve head where the stem turns into the head is not optimim and the face in the middle of the valve head is now recessed to aid gas flow. Also if you are hoping to go for very high lift on the valves it makes life easier if the thicker part of the stem is about 0.1 inch longer than standard but the overall length needs to be as the original. Terry Prince can supply springs which have the same seat pressure when closed but allow longer valve movement.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 31486, member: 456"] My advice is not to make the valves like the original ones anyway. Valve design has moved on in 60+ years and you will find that the modern valves do not have the same shape as the originals. The radius of the curve at the rear of the valve head where the stem turns into the head is not optimim and the face in the middle of the valve head is now recessed to aid gas flow. Also if you are hoping to go for very high lift on the valves it makes life easier if the thicker part of the stem is about 0.1 inch longer than standard but the overall length needs to be as the original. Terry Prince can supply springs which have the same seat pressure when closed but allow longer valve movement. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Looking for drawings of BCD intake and exhaust valves
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