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SB 1000 #14 Cylinder Head Bolt Torque Change 11-8-78 (1 page)
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Classic Goldwing Technical Forums
General Classic Goldwing Technical Forum
For the Iggy technoids.
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<blockquote data-quote="PowerArc" data-source="post: 91320" data-attributes="member: 3041"><p>Multifaceted question, lets start with coil saturation or dwell and a second post on basic coil design.</p><p>Coil saturation is the time the coil is on or charging in degrees of crank angle. Points have no way to control this other than the time they are closed and this is fixed thorough out the entire spectrum of the engines operation. The points need to be closed long enough to charge the coil enough that it will jump the spark plug gap, the higher the RPM the less charge time. So if you increase the saturation to optimum for the big end you also increase the on time at an idle.</p><p> </p><p>Example:</p><p><em>At 10,000 RPM the engine completes each crank revolution in 0.006 seconds or 6 ms.</em></p><p>At 1 RPM with a coil on time of 36° of dwell it would charge or be on for 10 seconds. 36° is 10% of 360° and 10% of 60 seconds = 6 seconds.</p><p>So at 100 RPM you would divide 6 seconds by 100, getting a total on time of .06 second, 1000 RPM - 0.006 and at 10,000 RPM you would get 0.0006 second.</p><p> </p><p>Since you know you only need the coil to be on for milliseconds, why would not shorten it at a low RPM? The less the coil on time (dwell or saturation) the less the total current and the cooler the coil will operate.</p><p></p><p>Idle in a parade and see how hot your coil gets</p></blockquote><p></p>
[QUOTE="PowerArc, post: 91320, member: 3041"] Multifaceted question, lets start with coil saturation or dwell and a second post on basic coil design. Coil saturation is the time the coil is on or charging in degrees of crank angle. Points have no way to control this other than the time they are closed and this is fixed thorough out the entire spectrum of the engines operation. The points need to be closed long enough to charge the coil enough that it will jump the spark plug gap, the higher the RPM the less charge time. So if you increase the saturation to optimum for the big end you also increase the on time at an idle. Example: [i]At 10,000 RPM the engine completes each crank revolution in 0.006 seconds or 6 ms.[/i] At 1 RPM with a coil on time of 36° of dwell it would charge or be on for 10 seconds. 36° is 10% of 360° and 10% of 60 seconds = 6 seconds. So at 100 RPM you would divide 6 seconds by 100, getting a total on time of .06 second, 1000 RPM - 0.006 and at 10,000 RPM you would get 0.0006 second. Since you know you only need the coil to be on for milliseconds, why would not shorten it at a low RPM? The less the coil on time (dwell or saturation) the less the total current and the cooler the coil will operate. Idle in a parade and see how hot your coil gets [/QUOTE]
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Classic Goldwing Technical Forums
General Classic Goldwing Technical Forum
For the Iggy technoids.
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