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  #1 (permalink)  
Old 04-18-2010, 06:11 PM
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dual fire ignition with single fire coils

i have an existing dual fire stampede ignition system. i am going to run two single fire coils mounted on my motor mount. is there a way to use the current ignition with the single fire coils? how would that be accomplished? i have a red/green/black/white wire to work with.

alternatively, is it just better to go with another ignition?

any assistance is appreciated.

JD27
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Old 04-18-2010, 08:15 PM
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MAybe a jumper wire between the coils....
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Old 04-19-2010, 01:09 AM
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Quote:
Originally Posted by jd27 View Post
i have an existing dual fire stampede ignition system. i am going to run two single fire coils mounted on my motor mount. is there a way to use the current ignition with the single fire coils? how would that be accomplished? i have a red/green/black/white wire to work with.

alternatively, is it just better to go with another ignition?

any assistance is appreciated.

JD27
If you have a dual fire ignition

You only want one (3 ohm) coil
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Old 04-19-2010, 05:00 PM
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Dual fire ignition will only have one trigger wire telling the coil when to spark. If you want to run single tower coils you can just run a a jumper between the two coils so they are both triggered by the single trigger wire.
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Old 04-19-2010, 07:16 PM
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You will need the correct ohm coils to match the ignition module (manufacturers recommendation) to provide the needed electronic impedance. The additional coil can be the same ohm rating and is simply jumped to the trigger terminal of the other coil. That will produce a spark to each plug on every crank revolution (dual fire).

Since some (most) electronic ignitions use coil impedance in the design of the module, it is essential that a correctly ohm rated coil is used (the secondary coil should be the same ohm rating).
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Old 04-20-2010, 12:25 AM
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Quote:
Originally Posted by pushrod243 View Post
Dual fire ignition will only have one trigger wire telling the coil when to spark. If you want to run single tower coils you can just run a a jumper between the two coils so they are both triggered by the single trigger wire.
John, What would be the advantage in running 2 coils in a dual fire set up?

A more powerful spark?

We're already talking 80,000v in a modern 3 ohm coil



Edit:

Sorry, I see now that you're talking about 2 single TOWER coils

Maybe that's what the original poster means, as well
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Old 04-20-2010, 08:09 AM
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Quote:
Originally Posted by Merlin Hawaii View Post
John, What would be the advantage in running 2 coils in a dual fire set up?

A more powerful spark?

We're already talking 80,000v in a modern 3 ohm coil



Edit:

Sorry, I see now that you're talking about 2 single TOWER coils

Maybe that's what the original poster means, as well
I hope thats what he means otherwise I see no reason to do it. The older Dyna coils used to wire up that way but looking in the catalog they now specofically say single fire or dual fire. On a Shovel though we used to dual plug them and wire as I described above with dual tower Dyna coils.
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Old 04-20-2010, 09:44 PM
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that was my original meaning. i have the dual fire ignition. but i am running two single fire coils mounted to the motor mount. would those still be 3 ohm coils or do they drop down to 1.5 ohm? i hope not as i already bit the bullet on those.

there is this pdf but i am not sure how to translate to two single fire/single plug coils.

http://www.mcadvantages.com/document...6910571159.pdf

JD27
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Old 04-20-2010, 09:54 PM
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Just make sure you wire them in parallel not series and the ohms will be ok.
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Old 04-20-2010, 10:04 PM
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which would mean that the jumper needs to be centered on the fire wire. i.e., it can not run to one coil first and then jump to the other. it needs to hit both coils simultaneously. not much of an electrician. apologies if i am missing the obvious.

why would the ohms not matter then? it just gets a hotter/better spark?

JD27
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Old 04-21-2010, 05:08 AM
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Quote:
which would mean that the jumper needs to be centered on the fire wire. i.e., it can not run to one coil first and then jump to the other. it needs to hit both coils simultaneously.
no...when the system is energized all points along it are electrically the same. go to one coil then jump to the other.
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Old 04-21-2010, 06:21 AM
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Quote:
no...when the system is energized all points along it are electrically the same. go to one coil then jump to the other.
but if memory serves that is not in parallel. could anyone give clarification on series or parallel wiring for this application?

Thanks
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Old 04-21-2010, 10:00 AM
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Here is a diagram... Red would be your jumper... In my opinion, I would buy a single fire Dyna ignition for $100 and put the one you have for sale on Craigslist or ebay and make up some of the cost....

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Old 04-21-2010, 02:36 PM
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Quote:
but if memory serves that is not in parallel
Memory is not serving, a jumper is parallel even with jumper cables. His drawing with jumper is correct.
Good luck!
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Old 04-26-2010, 01:00 PM
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thanks for all the information. going to try to run with the existing ignition for now until i can build up some more cash. never thought the end of the bike would tap me out like it did.

JD27
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