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01-27-2021, 09:49 PM | #21 |
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Join Date: Feb 2011
Posts: 253
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Re: Runs great until it heats up
Welding with battery connected or even disconnected but with you electronic Mallory still connected isn't good. They probably killed the module in your distributor. My two cents.
Brother just did the same thing last race season on his gasser Falcon and killed his MSD box. It would crank and run, but act weird under load. He figured it out AT the track... |
01-27-2021, 10:59 PM | #22 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
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Re: Runs great until it heats up
Run aftermarket electronic ignitions at your own peril.
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01-28-2021, 01:49 AM | #23 |
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Join Date: May 2010
Location: Melbourne Australia.
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Re: Runs great until it heats up
Mr tubman, exactly my sentiments. Although I have pertronix units on my early falcon and mustang for many years and no issues. They are easy to change back to points/condenser on the side of the road. Regards, Kevin.
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01-28-2021, 05:30 PM | #24 |
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Location: Cozumel and Deming N.M.
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Re: Runs great until it heats up
i guess you ruled out vapor lock?
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01-31-2021, 05:39 AM | #25 |
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Join Date: Mar 2019
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Re: Runs great until it heats up
Both idling and under load, but more pronounced under load. Haven't ruled out vapor lock. I did rule out the ballast resistor for the coil. I put a new one on, problem continues. Coil is hot enough when I got back to cause me to take my hand off of it really quick.
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01-31-2021, 07:41 AM | #26 |
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Re: Runs great until it heats up
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Looks like you are on the way to a solution. You've still got a problem with the mismatch of coil/resister. |
01-31-2021, 02:15 PM | #27 |
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Join Date: May 2010
Location: Florida and Penna.
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Re: Runs great until it heats up
What is the voltage at the coil, points open and points closed. G.M.
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01-31-2021, 03:04 PM | #28 |
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Location: Wichita KS
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Re: Runs great until it heats up
What ballast resistor and which coil are you using?
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01-31-2021, 06:19 PM | #29 |
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Join Date: May 2010
Location: Melbourne Australia.
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Re: Runs great until it heats up
No point in just guessing here and swapping around parts, you have to do some testing with a meter because your coil should not be that hot. Its hot because its drawing too much current. Measure the coil primary resistance in ohms and also the resistor which should measure up to a total of approx 3 or 4 ohms. Another way is to measure the current draw of the coil with the engine running at idle speed. Should be no more than three amps. As you rev the engine up a little the current draw should lower to maybe two amps. Regards, Kevin.
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01-31-2021, 09:07 PM | #30 |
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Re: Runs great until it heats up
Kevin, can you explain this to us wanabe electrical geeks? Why is current draw less with slight increase in RPMs?
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01-31-2021, 10:07 PM | #31 |
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Location: Melbourne Australia.
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Re: Runs great until it heats up
Jay, The distributor contacts or the electronic switching pick up (on an electronic ignition) in the coil primary circuit act as a kind of regulator by rapidly switching on and off and the more engine RPMs you have then the faster the switching cycle and therefore the lower current (amps) draw in the coil primary circuit. That is also how a voltage and current regulator works on your cars generator circuit. Hope you can take in that explanation. Regards, Kevin.
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02-03-2021, 10:42 AM | #32 |
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Join Date: May 2013
Location: Pa.
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Re: Runs great until it heats up
I had a similar prob early on when going w a New engine that was supplied w a resistor mounted to the Engine engine next to coil. Not thinking about it I hooked up the ignition circuit mounted on engine to the stock wire on the wiring harness for the ignition. I didn’t take into consideration that that wire already had the under-dash stock resistor in the Car wiring circuit so ended up w current going thru both resistors causing a similar problem SRG is having. Eliminated the under-dash resistor & problem disappeared.
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Nomad Last edited by AnthonyG; 02-03-2021 at 10:44 AM. Reason: Typo |
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