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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speedos to rev counters
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<blockquote data-quote="ClassicBiker" data-source="post: 110604" data-attributes="member: 1632"><p>I would have to agree with you Ed. What I have read on Smiths speedometers is the numbers on the face indicate the model and the number of rotations of the cable per mile. Which I take is for there for the odometers but it would stand to reason that if the number is say 1000 and I cover a mile in one minute the cable turned 1000 rpm. So if the cable is spinning a 1000 rpm the needle will move to the 60 MPH mark. So if I know the ratio of my speedometer drive I know how many RPM the cable is doing for a given speed. A tachometer that is driven from a gearbox on the end of a camshaft is running at 1/4 engine speed times the gearbox ratio. If that gearbox ratio is 1:1 for argument then the cable is turning at 250 RPM for an indicated 1000 RPM of engine speed. So if you were to hook it to a cable turning at 1000 RPM is would indicate 4000 RPM.</p><p>Steven</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 110604, member: 1632"] I would have to agree with you Ed. What I have read on Smiths speedometers is the numbers on the face indicate the model and the number of rotations of the cable per mile. Which I take is for there for the odometers but it would stand to reason that if the number is say 1000 and I cover a mile in one minute the cable turned 1000 rpm. So if the cable is spinning a 1000 rpm the needle will move to the 60 MPH mark. So if I know the ratio of my speedometer drive I know how many RPM the cable is doing for a given speed. A tachometer that is driven from a gearbox on the end of a camshaft is running at 1/4 engine speed times the gearbox ratio. If that gearbox ratio is 1:1 for argument then the cable is turning at 250 RPM for an indicated 1000 RPM of engine speed. So if you were to hook it to a cable turning at 1000 RPM is would indicate 4000 RPM. Steven [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speedos to rev counters
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