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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old Coil Ignition Points Identification
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<blockquote data-quote="Pete Appleton" data-source="post: 108583" data-attributes="member: 145"><p>As Simon says, two coils - two condensers - you are effectively running two seperate ignition systems and the only concern with the points gap is to get the dwell, hence the coil charging time right. You can ignore everything below.</p><p></p><p>If you have two sets of points and only one coil then you have got the points wired in parallel. As per the old Ford V8 Pilot engine. The point gap complication with this comes about because for it to spark you need BOTH sets of points open at the same time.</p><p></p><p>Consider cylinder 1 firing. This happens when set of points number one opens. If the points are wired in parallel and points number two have already closed, due to a small gap, then opening set number one will not cause a spark because the electrical path is continuous through points two. For cylinder one the chronology goes...</p><p></p><p>Points 2 still open.... Coil charging via closed points 1</p><p>Points 2 still open. Points 1 open to fire the spark.</p><p>Points 2 close to begin charging (dwell) period. Points 1 remain open ready for cylinder two firing.</p><p></p><p>Ford supplied a horrendously complicated angle gauge / test lamp system to set the V8 up. For a twin cylinder engine you should be able to do this visually. For a twin points / singlecoil system the cam needs to be different from just a single cylinder cam with two sets of points on it.</p><p></p><p>For a 'V' engine one cylinder will be more susceptible to this than the other. You might even need two different gaps. - although that might mess up your 310-410 cylinder timing.</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 108583, member: 145"] As Simon says, two coils - two condensers - you are effectively running two seperate ignition systems and the only concern with the points gap is to get the dwell, hence the coil charging time right. You can ignore everything below. If you have two sets of points and only one coil then you have got the points wired in parallel. As per the old Ford V8 Pilot engine. The point gap complication with this comes about because for it to spark you need BOTH sets of points open at the same time. Consider cylinder 1 firing. This happens when set of points number one opens. If the points are wired in parallel and points number two have already closed, due to a small gap, then opening set number one will not cause a spark because the electrical path is continuous through points two. For cylinder one the chronology goes... Points 2 still open.... Coil charging via closed points 1 Points 2 still open. Points 1 open to fire the spark. Points 2 close to begin charging (dwell) period. Points 1 remain open ready for cylinder two firing. Ford supplied a horrendously complicated angle gauge / test lamp system to set the V8 up. For a twin cylinder engine you should be able to do this visually. For a twin points / singlecoil system the cam needs to be different from just a single cylinder cam with two sets of points on it. For a 'V' engine one cylinder will be more susceptible to this than the other. You might even need two different gaps. - although that might mess up your 310-410 cylinder timing. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old Coil Ignition Points Identification
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