3.5 ignition coil - Mercedes-Benz Forum

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post #1 of 21 (permalink) Old 06-02-2014, 04:55 AM Thread Starter
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3.5 ignition coil

Hi guys, I just bought an igniter 1 setup to convert from points to elec ignition.
I was wanting to change the coil at the same time to take advantage of the setup.
Any advice what coil to run? I was thinking a flame thrower 2 but was unsure what ohms it needs to be?
I'm sure others have done this mod before. Anyone?


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post #2 of 21 (permalink) Old 06-02-2014, 06:26 AM
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I've done the mod. Get the cheapest Flamethrower coil - the upgrade only adds 5,000 extra volts to the final spark and isn't necessarily worth the money.

Your car will run 1000% better with the new stuff, btw. A word to the wise (that wasn't me when I did it) - track what wires you take off and where they used to go, in case something doesn't work or leaves you stumped. That way, you can go back to original as a troubleshooting step.
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post #3 of 21 (permalink) Old 06-02-2014, 06:32 AM Thread Starter
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What ohm coil did u run?
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post #4 of 21 (permalink) Old 06-02-2014, 09:12 AM
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I also have the Pertronix ignition and coil. Per the Pertronix catalog (page 56), If you are running a 12 Volt system, then you need a 1.5 Ohm coil for 8 cylinder engines and 3 Ohm coil for 6 or 4 cyl.
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post #5 of 21 (permalink) Old 06-03-2014, 05:15 AM Thread Starter
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Have to remove the resistor?? The coil has a built in resistor, is that correct?


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post #6 of 21 (permalink) Old 06-03-2014, 08:04 AM
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PerTronix (Hall Effect) Ignition for Mercedes-Benz Pontons © www.mbzponton.org

This page and guide by the late Randy Durrance helped me with installation...
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post #7 of 21 (permalink) Old 06-05-2014, 03:55 AM Thread Starter
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Originally Posted by jmela View Post
PerTronix (Hall Effect) Ignition for Mercedes-Benz Pontons © www.mbzponton.org



This page and guide by the late Randy Durrance helped me with installation...

Hi, thanks so much for the link, very informative!!


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post #8 of 21 (permalink) Old 06-07-2014, 12:15 AM Thread Starter
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My intention is to replace the points with elec ignition. Just for my own reasons I'd like to try get a decent tune on the point ign. The engine is popping through the exhaust every now and again. Unsure what could be causing it.
I removed the plugs for a look and they're pretty black.

I thought I'd check the timing and dwell timing is at 8deg advanced 34deg dwell. Premium fuel Ron 98. I'm thinkin she needs more timing not pinging and when you floor it she stutters and goes which tells me it could do with more timing.

Thoughts?


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post #9 of 21 (permalink) Old 06-14-2014, 03:15 AM Thread Starter
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Well what I thought would happen did happen. Removed the points and fitted the module this was pretty easy. Removed the coil and replaced with flamethrower type and vehicle won't start. No spark. I think the prob is the coil wiring. I thought all I'd have to do is the pos wire that ran off the ballast resistor remove the whole resistor and connect the wire that fed the resistor and connect it straight to the pos on the coil. Then I noticed a second resistor ???? Pretty sure this is std setup but I'm unsure if the wiring is correct. With ign on the pos side of the coil has power but my test light is dim. I don't think the voltage is correct. Haven't got a multimeter either. 3.5 ignition coil-imageuploadedbyag-free1402737212.672322.jpg3.5 ignition coil-imageuploadedbyag-free1402737227.455285.jpg3.5 ignition coil-imageuploadedbyag-free1402737250.030133.jpg

This components are still in the pos circuit?

Advice/help


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post #10 of 21 (permalink) Old 06-14-2014, 10:48 AM
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The ignitor red wire goes to + on coil as does the wire with +12v on it. No resistor in between +12v and coil..
if you still have the resistor connected at +12v point engine will miss!
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