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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
H.T. Coils
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<blockquote data-quote="Pete Appleton" data-source="post: 100419" data-attributes="member: 145"><p>The problem caused by a low resistance coil when used with points ignition is the current draw, and hence heat build up, when you have the engine stopped and the ignition turned on with the points closed.</p><p></p><p>Current is Volts / Resistance. </p><p></p><p>A 12 Volt coil with a 2 Ohm resistance will try to dissipate 6 Amps or 72 Watts with the points closed. You can see that it would soon burn the points or melt the coil.</p><p></p><p>A 12Volt coil with the correct points type, 5 Ohm, coil will use 2.4 Amps and wont melt.</p><p></p><p>A 6Volt coil with a 2 Ohm resistance will use 3 Amps and so should be fine with points ignition. I don't think that I have ever seen a 6V coil for electronic ignition but I am sure someone will tell me otherwise. What voltage is the Rita?</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 100419, member: 145"] The problem caused by a low resistance coil when used with points ignition is the current draw, and hence heat build up, when you have the engine stopped and the ignition turned on with the points closed. Current is Volts / Resistance. A 12 Volt coil with a 2 Ohm resistance will try to dissipate 6 Amps or 72 Watts with the points closed. You can see that it would soon burn the points or melt the coil. A 12Volt coil with the correct points type, 5 Ohm, coil will use 2.4 Amps and wont melt. A 6Volt coil with a 2 Ohm resistance will use 3 Amps and so should be fine with points ignition. I don't think that I have ever seen a 6V coil for electronic ignition but I am sure someone will tell me otherwise. What voltage is the Rita? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
H.T. Coils
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