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MG MGB GT V8 Factory Originals Technical - Cuts Out

V8 with Mallory has suddenly decided to cut out on an intermittent basis. No coughing so not fuel, but will restart immediately. Any ideas why apparent random spasmodic gremlin.
Gerrard

I had a helical coil wire give a pretty hard to find symptom. The car idled fine, and was ok till upper range of rpm. It seemed to get worse as the engine warmed up.

I ended up finding this only by switching to a new coil that forced me to make a new coil wire.

My new coil was higher output and caused the symptoms to get worse. So I started swapping parts with the old coil. (the engine was not wanting to run above idle, sounded like I had a rev limiter cutting in). Anyway, I finally built a new coil wire (last suspect in my list.) Wow, all of a sudden, it started singing again.

As per one of the "hotrod a rover" books, I went to a set of SOLID CORE (copper) plug wires. Everything is working better. Car also starts better once it has gotten hot. The book gives specific mallory part numbers which I bought.

Bottom line is that the expensive helical wound wire apparently had a break in it somewhere. I was just LUCKY that I was forced to find it.

SO, me with my Mallory dual point distributor, big mallory finned coil and a solid copper set of wires are now creating more ignition noise than we should. But really guys, listening to the radio at speed was not all that good before.

I highly recommend giving the boot to those new style wires on systems that can.

I bought all these from Summit Racing. wires $30, new mallory coil, $70. happiness - priceless.
Richard Morris

That helical coil wire refers to the helical (spiral) wound carbon core plug wires.
Richard Morris

This thread was discussed on 05/07/2007

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