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<blockquote data-quote="Tom Gaynor" data-source="post: 6458" data-attributes="member: 4034"><p><strong>Speed and how to obtain it</strong></p><p></p><p>Hey, good title for a book, no?</p><p>While eny fule noe that the Guzzi Gambalunga (literally "leg long") is named for its very long stroke, fewer people know what its bore and stroke were. They were 84 and 90 respectively. Of course if the Vincent had a shorter stroke, the heads wouldn't reach the UFM.........</p><p></p><p> <em>(Some text from the previous message deleted here)</em> ;6450]I'm heavily involved in the car tuning world and the motto there is , the head is where the power is !! Simple matter of volumetric efficiency. The head and chamber design of Vincents (post war) was probably near state of the art when introduced , but fuel quality was terrible hence the low CR's. I'm happy with some mild porting work , bigger carbs and increased CR on my Rapide as my preference is for originality and the twin has impressive power & torque even in standard spec. However , for a significant increase in power the head and chamber would need serious modification , requiring a full weld up and re-machine. Then more revs would be required and I'm not sure the standard lubrication system could cope. Also , the mag would probably run into problems with high revs so a modern igntion system would be required.</p></blockquote><p>[/QUOTE]</p>
[QUOTE="Tom Gaynor, post: 6458, member: 4034"] [b]Speed and how to obtain it[/b] Hey, good title for a book, no? While eny fule noe that the Guzzi Gambalunga (literally "leg long") is named for its very long stroke, fewer people know what its bore and stroke were. They were 84 and 90 respectively. Of course if the Vincent had a shorter stroke, the heads wouldn't reach the UFM......... [I](Some text from the previous message deleted here)[/I] ;6450]I'm heavily involved in the car tuning world and the motto there is , the head is where the power is !! Simple matter of volumetric efficiency. The head and chamber design of Vincents (post war) was probably near state of the art when introduced , but fuel quality was terrible hence the low CR's. I'm happy with some mild porting work , bigger carbs and increased CR on my Rapide as my preference is for originality and the twin has impressive power & torque even in standard spec. However , for a significant increase in power the head and chamber would need serious modification , requiring a full weld up and re-machine. Then more revs would be required and I'm not sure the standard lubrication system could cope. Also , the mag would probably run into problems with high revs so a modern igntion system would be required.[/quote] [/QUOTE]
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