"Dogapult" (dogapult)
05/09/2016 at 13:26 • Filed to: None
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"Dogapult" (dogapult)
05/09/2016 at 13:26 • Filed to: None | 1
| 4 |
So I’m not a wiring guru. I don’t fully understand it. But I try.
Recently I bought a Mallory 29440 ignition at a swap meet. Far as I’ve read, it’s 55,000 volts and 0.6 Ohms.
What a goofy big box these are!
I’ve currently got a Flamethrower coil (40k volts) in the 1973 Toyota Celica with unknown ohms. (bought it with the electronic points for a 20r off of ebay a few years ago)
I’ve got a Pertronix set of electric points (for a 20R) that says they shouldn’t be used with a resistance under 1.5 ohms.
I’ve got a
!!!error: Indecipherable SUB-paragraph formatting!!!
because the stock ballast resistor broke. unofficially, it supposedly has a resistance of 1.6 ohms, because I couldn’t find a resistance number for it officially.
I realize ballast resistors should be wired in between the coil and the distributor points.
Will this work with the Mallory coil without destroying things? I have no idea. Can someone who knows more shed some light?
Thanks in advance!
SidewaysOnDirt still misses Bowie
> Dogapult
05/09/2016 at 13:30 |
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You can measure the resistance of your leads using a digital multimeter. That will take out some of the guesswork.
Scott
> Dogapult
05/09/2016 at 14:21 |
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Best bet is to talk to Mallory Customer Service, although they will likely have the same issues I have in giving an answer. Generally speaking in a simple circuit like this higher resistance will not do damage. That said with the higher output from this coil 55KV vs 40KV and assuming that you were using the same Ballast in both situations, and similar resistance on the old coil (which seems likely) you’ll be increasing both the voltage and the current. Current is what typically does damage, so it is difficult to say without more details.
One other thing, generally with a more powerful ignition system it is desirable to open up you plug gap. I can't tell you by how much, and would not feel comfortable making an educated guess. Opening up the gap, will help offset some of the increase in current (the nature of an ignition system it gets trickier than that) and it will help expose your air fuel mixture to more of the spark which is really the point of a more powerful ignition.
brianbrannon
> Dogapult
05/09/2016 at 18:07 |
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You’ll be fine as long as the resistor is .9 ohms or higher. It should be or the points would have been burning out. The rub is the coil only puts out enough volts to jump the spark gap. So any performance gain comes from making the spark plug gap larger on a stock engine. Higher volt coils are more for high compression engines. The multi spark boxes do help on stock engines though.
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brianbrannon
> Dogapult
05/09/2016 at 18:11 |
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A coil only puts out enough volts to jump the plug gap. The bigger coil will put out the same volts as the smaller one. Unless you added a high compression engine or boost you aren’t going to see any gains. Wire in a multi spark box though and you have a result