Current drawn by the ignition coils

discussions specific to the 750 Paso

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Frank.61
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model: 750 Paso
year: 1989
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Current drawn by the ignition coils

Post by Frank.61 »

Maybe an odd question: has anyone ever measured the current drawn by the ignition coils? :?:

Frank
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Mc tool
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Re: Current drawn by the ignition coils

Post by Mc tool »

I have not measured the actual current draw but the stock coils have bugger all resistance ( 0.34 ohm) so I would say its fairly high , but then the dwell time ( the time the current actually flows because the coils are switched on and off so the current flow is not continual ) must be reasonably short. You could put an amp meter in series with the coil but I doubt that it would tell you anything useful as the coil powers on and off 100 times per second at 6000rpm and the meter wont display that fast . You could hook a coil up to a battery with the amp meter in series and that would tell you the continual current flow but again not all that useful. To get a accurate idea of whats really going on would require an oscilloscope and the nouse to figure out what its telling you...... any how ,if your thinking about fitting new coils , Dyna do a suitable replacement but you would have to do a search here as others have done this but I cant remember what coils they used.
Hamish
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Frank.61
Posts: 264
Joined: Fri Jul 24, 2015 11:21 am
model: 750 Paso
year: 1989
Location: Belgium

Re: Current drawn by the ignition coils

Post by Frank.61 »

Yeah, I was also afraid that you would need an oscilloscope for it.
I was curious which wire diameter I could take the best.
A specialist told me to keep 5A per square millimeter (17awg) as a maximum for motorcycle wire loom.
I have 3ohm Dynatek coils but have no idea what they actually draw during the 360 degrees cycles.
Just curious ...


Frank
Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
Ducati Monster 796 abs - 2010
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Derek
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Re: Current drawn by the ignition coils

Post by Derek »

For fuse purposes you need to look at the continuous current being drawn at switch on when the engine isn't running. A 3Ω coil will draw approx 4 amps, so 2 coils will pull 8A. When the engine is running, as stated above, the current draw will be much less.
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Mark
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Re: Current drawn by the ignition coils

Post by Mark »

California Cycleworks designed a coil replacement kit that should work and fit for 750 Pasos with the Kokusan ignition system:

http://ca-cycleworks.com/ca-cycleworks- ... ls/2vcoils

About a decade ago I installed green 3ohm dynacoils, had a bracket fabricated and used Magnecor ignition leads - the bike ran significantly better thereafter.

Cheers,

Mark
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