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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Who's Vincent/Hrd has the most power?
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<blockquote data-quote="davidd" data-source="post: 44277" data-attributes="member: 1177"><p>Thanks Brt and it was an interesting question that Roy posed. As always, there are certain limitations that street riding imposes, but in general, my racer is dyno tested on pump gas with no issues. I run race fuel at the track because of availability, but premium unleaded seems to do fine. With the exhaust system I am running now I am stuck at 37-38 BHP at the rear wheel, but with a straight pipe it is 41. I think I can do 43 with some investment in exhaust tuning, but I have not been able to do that at this time. </p><p></p><p>Just speaking generally, the bike idles well, I believe, as the carb has no stop, but it does not want to stop or stall. With say 40 hp on a single, this is 80 or so on a twin. I would guess that a reasonable limit on a twin would be 90 on a stock Vincent. You can go a little higher, but I would guess that you will run into heating issues. I was told by someone who dyno tested stock engines (that is stock heads, cylinders and cases) that 100 bhp was about the limit. Obviously you can go much higher, but only for land speed records or short bursts. This is the advantage of the Terry Prince heads and cylinders that have double the finning. They provide a great advantage over the stock items.</p><p></p><p>In general with the lower hp, tires width does not matter much. The vintage racing tires we use are very difficult to brake loose unless it is greasy or you are on paint. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 44277, member: 1177"] Thanks Brt and it was an interesting question that Roy posed. As always, there are certain limitations that street riding imposes, but in general, my racer is dyno tested on pump gas with no issues. I run race fuel at the track because of availability, but premium unleaded seems to do fine. With the exhaust system I am running now I am stuck at 37-38 BHP at the rear wheel, but with a straight pipe it is 41. I think I can do 43 with some investment in exhaust tuning, but I have not been able to do that at this time. Just speaking generally, the bike idles well, I believe, as the carb has no stop, but it does not want to stop or stall. With say 40 hp on a single, this is 80 or so on a twin. I would guess that a reasonable limit on a twin would be 90 on a stock Vincent. You can go a little higher, but I would guess that you will run into heating issues. I was told by someone who dyno tested stock engines (that is stock heads, cylinders and cases) that 100 bhp was about the limit. Obviously you can go much higher, but only for land speed records or short bursts. This is the advantage of the Terry Prince heads and cylinders that have double the finning. They provide a great advantage over the stock items. In general with the lower hp, tires width does not matter much. The vintage racing tires we use are very difficult to brake loose unless it is greasy or you are on paint. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Who's Vincent/Hrd has the most power?
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