Pertronix pointless ignition question

1950 - 1968, M38, M38A1, M170, modifications, sugestions, and ideas, official MWO's and unofficial field mods.
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TransCorps
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Pertronix pointless ignition question

Post by TransCorps » Thu Jul 21, 2016 8:13 am

Hello everyone, I'm thinking of installing a pertronix pointless ignition in my 24 volt M38, part # MV-141A. When I look through the pertronix catalog, one of the footnotes mentions "not for use with solid core spark plug wires". I have original type spark plug wires in my M38, so I assume these are solid core? If so can I not use this with the original type plug wires? I have searched through the posts but couldn't really find the answer.

Also has anyone already installed this pointless system, just seeing what else I have to do to the distributor for this installation. Do I have to adjust the gaps on the plug?

Footnotes from pertronix catalog...
66 24-volt system
67 Mil-Spec Waterproof Ignition
79 Not for use with solid core spark plug wires

Thanks for the help...
Paul
March 1943 GPW - 104728 (Sold)
April 1951 M38

"Nothing happens, till something moves!"
"Spearhead of Logistics!"

Bill F
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Re: Pertronix pointless ignition question

Post by Bill F » Thu Sep 15, 2016 1:10 pm

I am using that kit in my m38 with orginal wires. No issues.
1952 USAF m38

eaw46
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Re: Pertronix pointless ignition question

Post by eaw46 » Fri Sep 16, 2016 7:44 am

I used a Pertronix kit in my M725 with good result. No changes in anything. Eddy

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TransCorps
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Re: Pertronix pointless ignition question

Post by TransCorps » Sun Oct 16, 2016 1:43 pm

Thanks guys, you're right works great with no changes...
Paul
March 1943 GPW - 104728 (Sold)
April 1951 M38

"Nothing happens, till something moves!"
"Spearhead of Logistics!"

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Re: Pertronix pointless ignition question

Post by EME-LT » Mon May 07, 2018 6:11 pm

Did you use a ballast resistor? If so what value is what was the value?
Cheers, Lyle
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Re: Pertronix pointless ignition question

Post by Bill F » Wed May 09, 2018 4:11 pm

No resistor is needed
1952 USAF m38

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Re: Pertronix pointless ignition question

Post by EME-LT » Thu May 10, 2018 11:46 am

Petronix requires 4-5 volts at the sensor.

Assuming (and you should check) the NOS 24 volt coil has an internal resistance of 3.0 ohms you will need a 3.0 ohm balance resistor... 24/3+3= 4 volts. Very straight forward and no magic.

If you do not reduce the voltage the warranty is void and the sensor WILL fail maybe not today or tomorrow but it will eventually.
Cheers, Lyle
Arte et Marte

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Re: Pertronix pointless ignition question

Post by Bill F » Tue May 15, 2018 6:02 am

I have been running mine for years without a resistor with no problems. The instructions for the 24 volt unit did not call for a resistor.
1952 USAF m38

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