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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old Coil Ignition Points Identification
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<blockquote data-quote="Nigel Spaxman" data-source="post: 108636" data-attributes="member: 2907"><p>I am trying to understand why Glens ignition doesn't work with .015 gap. The same ignition works with .015 gap on Triumphs, Nortons, and also the BSA and Triumph Triples. It guess the triple is like a vee twin with a 120 degree angle between the cylinders and a third cylinder added. You would almost think that you could add as many of these circuits as you wanted and it would still work.</p><p>I guess it must have to do with the dwell. When either set of points open that should cause a spark if the coil is charged. It may be though that the dwell is such with the .15" gap that just before the points open on the rear cylinder, or more or less simultaneously, the points close for the front one. When the front points close the condenser for the front cylinder is suddenly connected to the circuit, maybe that right at the worst possible time causes a drop in voltage to the other coil and condenser, and it discharges the other coil just before it needs to fire?</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 108636, member: 2907"] I am trying to understand why Glens ignition doesn't work with .015 gap. The same ignition works with .015 gap on Triumphs, Nortons, and also the BSA and Triumph Triples. It guess the triple is like a vee twin with a 120 degree angle between the cylinders and a third cylinder added. You would almost think that you could add as many of these circuits as you wanted and it would still work. I guess it must have to do with the dwell. When either set of points open that should cause a spark if the coil is charged. It may be though that the dwell is such with the .15" gap that just before the points open on the rear cylinder, or more or less simultaneously, the points close for the front one. When the front points close the condenser for the front cylinder is suddenly connected to the circuit, maybe that right at the worst possible time causes a drop in voltage to the other coil and condenser, and it discharges the other coil just before it needs to fire? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old Coil Ignition Points Identification
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