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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Points Ignition
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<blockquote data-quote="oexing" data-source="post: 134417" data-attributes="member: 1493"><p>Dwell angle on a twin should not be an argument at all. Remember that even V 8s had a simple distributor and one contact breaker for many decades. Yes, in these engines dwell angle is critical definitely but not with twins or fours. </p><p> Not my project but I´d go for a Saab distributor and dual coil ignition with one contact breaker once you got a decent generator on the bike. With the correct Saab type - watch rotation sense because of advance device in it - you then get a fat spark from battery coil ignition, no weak sparks from poor mags, be it electronic or traditional . In case you were not happy about the contact breaker (weak argument) you could have a Lucas Lumenition to replace the breaker. There are a few electronic ignitions for classic distributors for that mod but basically a contact breaker is quite allright, for 100 years in all cars and bikes they were good enough and had no complicated failures to worry about. With the Saab type you have to grind one breaker lobe for the 50 degree Vincent engine, I´d prefer this over having two breakers and one lobe . And certainly you need an adapter with a ball bearing to clamp the distributor to the engine, no big deal on the lathe. As the saying goes: Keep it simple, stupid . . . </p><p></p><p> Vic</p><p></p><p>[ATTACH=full]40323[/ATTACH]</p><p></p><p>[ATTACH=full]40324[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 134417, member: 1493"] Dwell angle on a twin should not be an argument at all. Remember that even V 8s had a simple distributor and one contact breaker for many decades. Yes, in these engines dwell angle is critical definitely but not with twins or fours. Not my project but I´d go for a Saab distributor and dual coil ignition with one contact breaker once you got a decent generator on the bike. With the correct Saab type - watch rotation sense because of advance device in it - you then get a fat spark from battery coil ignition, no weak sparks from poor mags, be it electronic or traditional . In case you were not happy about the contact breaker (weak argument) you could have a Lucas Lumenition to replace the breaker. There are a few electronic ignitions for classic distributors for that mod but basically a contact breaker is quite allright, for 100 years in all cars and bikes they were good enough and had no complicated failures to worry about. With the Saab type you have to grind one breaker lobe for the 50 degree Vincent engine, I´d prefer this over having two breakers and one lobe . And certainly you need an adapter with a ball bearing to clamp the distributor to the engine, no big deal on the lathe. As the saying goes: Keep it simple, stupid . . . Vic [ATTACH type="full"]40323[/ATTACH] [ATTACH type="full"]40324[/ATTACH] [/QUOTE]
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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Points Ignition
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