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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BHP measuring
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<blockquote data-quote="Howard" data-source="post: 12294" data-attributes="member: 271"><p>Ok, first part answered, Vincent had a Heenan Froud dyno, I suspect it was probably chain driven from the final drive sprocket, not the crank, so Albervin's thoughts that 55 bhp is a rear wheel power is probably right. Probably around 60 at the crank allowing for losses in the gearbox, primary chain etc.</p><p> </p><p>55 bhp = 125 mph but 125 bhp = 165 mph is still a puzzle for me. Like other subscribers to this thread I used to tell myself that it's because of the torque, but by definition torque cannot do the work, because there's no time factor involved in torque measurement. It's got to be power measured in ft.lbs/sec which determines the speed in ft/sec not the torque which is only measured in ft.lbs (Sorry if ft and lbs are the wrong way round, I use metric units these days).</p><p> </p><p>Torque may be part of the answer, but I don't think it's engine torque. If more torque is needed at the rear wheel we change down a gear and rev the engine more, the engine produces more power, and the gearbox converts it to more torque at the wheel.</p><p> </p><p>I've worked for a long time with industrial electic drives including 0.25 kW electric motors geared down so far they produce 100,000 Nm of torque, but they turn so slowly you can't see any movement.</p><p> </p><p>Any more for any more? My brain must be missing something.</p><p> </p><p>H</p></blockquote><p></p>
[QUOTE="Howard, post: 12294, member: 271"] Ok, first part answered, Vincent had a Heenan Froud dyno, I suspect it was probably chain driven from the final drive sprocket, not the crank, so Albervin's thoughts that 55 bhp is a rear wheel power is probably right. Probably around 60 at the crank allowing for losses in the gearbox, primary chain etc. 55 bhp = 125 mph but 125 bhp = 165 mph is still a puzzle for me. Like other subscribers to this thread I used to tell myself that it's because of the torque, but by definition torque cannot do the work, because there's no time factor involved in torque measurement. It's got to be power measured in ft.lbs/sec which determines the speed in ft/sec not the torque which is only measured in ft.lbs (Sorry if ft and lbs are the wrong way round, I use metric units these days). Torque may be part of the answer, but I don't think it's engine torque. If more torque is needed at the rear wheel we change down a gear and rev the engine more, the engine produces more power, and the gearbox converts it to more torque at the wheel. I've worked for a long time with industrial electic drives including 0.25 kW electric motors geared down so far they produce 100,000 Nm of torque, but they turn so slowly you can't see any movement. Any more for any more? My brain must be missing something. H [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BHP measuring
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