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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series D Distributor wanted because Boyer quit, again.
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<blockquote data-quote="Simon Dinsdale" data-source="post: 25722" data-attributes="member: 58"><p>Hi Bill,</p><p></p><p>It's all down to the duration the points are closed / open. On my twin points setup due to the cam profile only one set of points are closed at any one time and so only one coil is drawing current (power) at any time. So on one full rotation of the shaft / cam each points close for approx 30 degrees (this is a guess not accurately measured) so each coil draws current for 30 degrees.</p><p>On a single coil and distributor for a twin, the cam has two lobes. Each lobe will most probable open and close the points for approx the same duration as the points in the above twin set up, but the distributor has two lobes so the distributor points open and close twice per shaft revolution to fire both cylinders and so the actual power consumption is the same. In a distributor the points are doing twice the work each seperate points do on a twin points setup.</p><p></p><p>Easiest way to see it is to watch the ammeter when slowly turning the engine over with the ignition on two seperate bikes where one bike is twin points setup and the other a D distributor. There will be no noticeable difference in current draw and duration as long as you turn each engine over at about the same rotation speed.</p><p></p><p>Hope the above makes sense.</p><p>Simon.</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 25722, member: 58"] Hi Bill, It's all down to the duration the points are closed / open. On my twin points setup due to the cam profile only one set of points are closed at any one time and so only one coil is drawing current (power) at any time. So on one full rotation of the shaft / cam each points close for approx 30 degrees (this is a guess not accurately measured) so each coil draws current for 30 degrees. On a single coil and distributor for a twin, the cam has two lobes. Each lobe will most probable open and close the points for approx the same duration as the points in the above twin set up, but the distributor has two lobes so the distributor points open and close twice per shaft revolution to fire both cylinders and so the actual power consumption is the same. In a distributor the points are doing twice the work each seperate points do on a twin points setup. Easiest way to see it is to watch the ammeter when slowly turning the engine over with the ignition on two seperate bikes where one bike is twin points setup and the other a D distributor. There will be no noticeable difference in current draw and duration as long as you turn each engine over at about the same rotation speed. Hope the above makes sense. Simon. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series D Distributor wanted because Boyer quit, again.
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