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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="JustPlainBill0" data-source="post: 108427" data-attributes="member: 4182"><p>For short term closure: I ran the China motor with an air die grinder @ 60 psi with a sealed beam headlight (55 watts) and measured 18 volts. The light was brightly illuminated. Based on the motor specs ( 1 VDC per 250 rpm) it was turning 4500 rpm (on a Vincent, 3680 engine rpm/ 80 mph. At that speed, the air die grinder had no difficulty spinning the motor. (Note, the motor is configured to run clockwise as is the air grinder. Which means the motor is being turned backward - counter clockwise by the die grinder. Not a problem, just use the red wire as ground and the black as hot.) </p><p></p><p> At 125 psi the voltmeter showed 29 volts and the die grinder ran out of "steam" in about 30 seconds. Motor speed would have been 7250 rpm. Vincent engine speed would be 5800, miles per hour 126. All perfectly doable...at Bonneville.</p><p></p><p>Timetraveller is pretty much right about the need to run my particular China motor substantially faster than engine speed to get acceptable power at ordinary road speeds. The brushless motors Vic is working with make full power (up to 400 watts) at 3000-4000 rpm. That's 2400 to 3200 engine rpm (~50 to 70 mph in 4th gear). </p><p></p><p>When the Watt Meter I ordered arrives, I'll test again and collect volts, watts and amp output to get a better idea as to whether the China motor will suffice or that I should be looking for a brushless motor. Which I already am.</p></blockquote><p></p>
[QUOTE="JustPlainBill0, post: 108427, member: 4182"] For short term closure: I ran the China motor with an air die grinder @ 60 psi with a sealed beam headlight (55 watts) and measured 18 volts. The light was brightly illuminated. Based on the motor specs ( 1 VDC per 250 rpm) it was turning 4500 rpm (on a Vincent, 3680 engine rpm/ 80 mph. At that speed, the air die grinder had no difficulty spinning the motor. (Note, the motor is configured to run clockwise as is the air grinder. Which means the motor is being turned backward - counter clockwise by the die grinder. Not a problem, just use the red wire as ground and the black as hot.) At 125 psi the voltmeter showed 29 volts and the die grinder ran out of "steam" in about 30 seconds. Motor speed would have been 7250 rpm. Vincent engine speed would be 5800, miles per hour 126. All perfectly doable...at Bonneville. Timetraveller is pretty much right about the need to run my particular China motor substantially faster than engine speed to get acceptable power at ordinary road speeds. The brushless motors Vic is working with make full power (up to 400 watts) at 3000-4000 rpm. That's 2400 to 3200 engine rpm (~50 to 70 mph in 4th gear). When the Watt Meter I ordered arrives, I'll test again and collect volts, watts and amp output to get a better idea as to whether the China motor will suffice or that I should be looking for a brushless motor. Which I already am. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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