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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas KVF Rebuild - UK Recommendations?
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<blockquote data-quote="oexing" data-source="post: 179032" data-attributes="member: 1493"><p>Chris, look at my 3 photos in the previous page. The first got the Bosch markings on rotor plus the vee on the brass plate for aligning when assembling the lot on the camshaft. This is the retarded position and internal timing of the magneto. So when you look at the second photo you can see same position from behind and the "stretch" of field lines by up to 11mm for retarded when the magnet pole piece has passed the iron block by a big amount. As there is an A/R device on the breaker end with advanced logically that 11 mm gap will become less by 15 degrees (30 degrees on crank), so only around 5mm remain at advanced. </p><p> When the atd is on the drive gear you´d have same retarded position as in photo no. 2 , speeds don´t matter, the internal timing in the mag remains fixed. Only with atd on breaker end the gap reduces with speed by centrifugal weights in the atd. </p><p> You can do tests with pressurized spark plugs, for plug testing or coil testing, does not deal with timing. </p><p> The big thing with magnetos in racing was always the higher the speeds the higher the voltage produced. Not so with battery coil ignition.</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 179032, member: 1493"] Chris, look at my 3 photos in the previous page. The first got the Bosch markings on rotor plus the vee on the brass plate for aligning when assembling the lot on the camshaft. This is the retarded position and internal timing of the magneto. So when you look at the second photo you can see same position from behind and the "stretch" of field lines by up to 11mm for retarded when the magnet pole piece has passed the iron block by a big amount. As there is an A/R device on the breaker end with advanced logically that 11 mm gap will become less by 15 degrees (30 degrees on crank), so only around 5mm remain at advanced. When the atd is on the drive gear you´d have same retarded position as in photo no. 2 , speeds don´t matter, the internal timing in the mag remains fixed. Only with atd on breaker end the gap reduces with speed by centrifugal weights in the atd. You can do tests with pressurized spark plugs, for plug testing or coil testing, does not deal with timing. The big thing with magnetos in racing was always the higher the speeds the higher the voltage produced. Not so with battery coil ignition. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas KVF Rebuild - UK Recommendations?
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