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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Muff to Crankcase shims and gaskets
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<blockquote data-quote="timetraveller" data-source="post: 32185" data-attributes="member: 456"><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">The volume of a standard Vincent cylinder head is 103.5 cc. The swept volume is 499 cc. Total is therefore 602.5 cc. If one had a flat topped piston the compression ratio would be 602.5/103.5 = 5.8:1. That is why pistons have domed heads. Each millimetre of swept volume is 499/90 = 5.54 cc so if the total depth of the compression plates and gaskets is 2 mm there is an increase in unswept volume of about 11 cc bringing the effective cylinder head volume up to 114.5 cc. The aforesaid flat topped piston would then give a compression ratio of 5.36:1.</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">In order to have a compression ratio of 9:1 one has to have an effective cylinder head volume of 62.5 cc. Increase this by the 11 cc above and one gets a compression ratio of 7.79:1, that is, near enough to 8:1. The combustion chamber shape is not ideal but lots of us have done it and been happy with the results. Also lots of us have also used 9:1 and been equally happy. Enjoy!</span></span></span></p></blockquote><p></p>
[QUOTE="timetraveller, post: 32185, member: 456"] [SIZE=3][COLOR=#000000][FONT=Calibri]The volume of a standard Vincent cylinder head is 103.5 cc. The swept volume is 499 cc. Total is therefore 602.5 cc. If one had a flat topped piston the compression ratio would be 602.5/103.5 = 5.8:1. That is why pistons have domed heads. Each millimetre of swept volume is 499/90 = 5.54 cc so if the total depth of the compression plates and gaskets is 2 mm there is an increase in unswept volume of about 11 cc bringing the effective cylinder head volume up to 114.5 cc. The aforesaid flat topped piston would then give a compression ratio of 5.36:1.[/FONT][/COLOR][/SIZE] [SIZE=3][COLOR=#000000][FONT=Calibri]In order to have a compression ratio of 9:1 one has to have an effective cylinder head volume of 62.5 cc. Increase this by the 11 cc above and one gets a compression ratio of 7.79:1, that is, near enough to 8:1. The combustion chamber shape is not ideal but lots of us have done it and been happy with the results. Also lots of us have also used 9:1 and been equally happy. Enjoy![/FONT][/COLOR][/SIZE] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Muff to Crankcase shims and gaskets
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