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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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<blockquote data-quote="DucATIRadeon" data-source="post: 176371" data-attributes="member: 5456"><p>my bad: <a href="https://www.godet-motorcycles.fr/modèles/le-racer-500/" target="_blank">Godet 500 Flash</a> claims 60hp.</p><p>those BxS combos come near the ABSAF (BSA Goldstar D34) competition engine config, they push out well over 50+hp below 7000rpm.</p><p>uses metric bearings and vernier cams but 1:1 interchangeable parts with the original BSA of the '50s.</p><p>their full race spec engine with 12.6:1 comp ratio and some goodies makes 7400rpm redline and ample torque to stay ahead of the pack.</p><p></p><p>coming back to Vincent: I'd've thought there were larger valves for these engines and room for improved air flow in the porting to keep it going with RON98E5 petrol (instead of blown and/or ethanol)?</p><p>for my Bullet I've been studying JAWA 2V engines, these do in the region of 60-80hp and upto 13000rpm for bob's sake!! cannot be compared to these English lumps, but still, gives perspective on what can be achieved with modern tech fitted to antiquated (yet advanced in those days) design. speaking of, the Godet 500 Flash is very near the JAWA engine BxS...</p><p></p><p>have yet to compare a stock Vincent piston with that of a RE 500 (apart from the gudgeon pin dia) perhaps these can fit in a Vin (piston prices in favour of the RE)?</p><p></p><p>apologies in hijacking this thread.</p></blockquote><p></p>
[QUOTE="DucATIRadeon, post: 176371, member: 5456"] my bad: [URL='https://www.godet-motorcycles.fr/modèles/le-racer-500/']Godet 500 Flash[/URL] claims 60hp. those BxS combos come near the ABSAF (BSA Goldstar D34) competition engine config, they push out well over 50+hp below 7000rpm. uses metric bearings and vernier cams but 1:1 interchangeable parts with the original BSA of the '50s. their full race spec engine with 12.6:1 comp ratio and some goodies makes 7400rpm redline and ample torque to stay ahead of the pack. coming back to Vincent: I'd've thought there were larger valves for these engines and room for improved air flow in the porting to keep it going with RON98E5 petrol (instead of blown and/or ethanol)? for my Bullet I've been studying JAWA 2V engines, these do in the region of 60-80hp and upto 13000rpm for bob's sake!! cannot be compared to these English lumps, but still, gives perspective on what can be achieved with modern tech fitted to antiquated (yet advanced in those days) design. speaking of, the Godet 500 Flash is very near the JAWA engine BxS... have yet to compare a stock Vincent piston with that of a RE 500 (apart from the gudgeon pin dia) perhaps these can fit in a Vin (piston prices in favour of the RE)? apologies in hijacking this thread. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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