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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old Coil Ignition Points Identification
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<blockquote data-quote="oexing" data-source="post: 108607" data-attributes="member: 1493"><p>Well, yes, it is a mainly battery coil ignition thread. But then , a mag IS a coil , contact breaker and capacitor ignition system all the same, just the electric current is generated in the mag. Otherwise the dwell angle is equally important, set by the breaker gap and cam shapes. </p><p>Anyway, we are mainly talking about twin ignitions up to max. four cylinder engines , I suppose ? So no question that dwell in a twin is in no way critical and so is the breaker gap. Even six cylinder engines are no drama at all with one coil, one capacitor and one contact breaker - once you stick to published dwell angles and gaps. Millions of car sixes were operated in that way, so I am struggling to find a reason for seeing troubles in a twin. My photo of the nine cylinder mag may show that - when expecting 3000 rpm from it that would be comparable to a 6000 rpm 4 1/2 cylinder engine, so obviously safe enough with one coil and breaker - even more so a twin and its 7000 rpm max . </p><p> Again, if you face problems in your ignition it is not your dwell angle or contact gap setting in all likelyhood, really. You´d better wiggle all components and wires in the unit and look for clapped out fits. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 108607, member: 1493"] Well, yes, it is a mainly battery coil ignition thread. But then , a mag IS a coil , contact breaker and capacitor ignition system all the same, just the electric current is generated in the mag. Otherwise the dwell angle is equally important, set by the breaker gap and cam shapes. Anyway, we are mainly talking about twin ignitions up to max. four cylinder engines , I suppose ? So no question that dwell in a twin is in no way critical and so is the breaker gap. Even six cylinder engines are no drama at all with one coil, one capacitor and one contact breaker - once you stick to published dwell angles and gaps. Millions of car sixes were operated in that way, so I am struggling to find a reason for seeing troubles in a twin. My photo of the nine cylinder mag may show that - when expecting 3000 rpm from it that would be comparable to a 6000 rpm 4 1/2 cylinder engine, so obviously safe enough with one coil and breaker - even more so a twin and its 7000 rpm max . Again, if you face problems in your ignition it is not your dwell angle or contact gap setting in all likelyhood, really. You´d better wiggle all components and wires in the unit and look for clapped out fits. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old Coil Ignition Points Identification
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