Quote:
Originally Posted by scott70
You can tighten the clamp all you want but for some reason it can creep advance or retard after you run it hard a few times. Just did it again,,,they set total at 32 on the dyno...once in the car I confirmed 32 total with my gun. Git a few miles on it now and it crept back to 30. I let it cool off over night and checked it again this morning...30 total.
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Quote:
Originally Posted by Formulajones
Sounds like something funky going on with the dwell time in the module.
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Anything is possible, but unlike a "points" ignition, the electronic dwell in the HEI module isn't known for changing the timing.
Quote:
Originally Posted by scott70
Now I noticed one of the wires that goes from the external module into the bottom of the dist has some burn spots on the insulation. The only way I can see that happening is if the wire leaned on the module which might of been hot. Or it got hot from the inside. Look at the yellow wire,,there's like 3 burn spots.I'm just kinda tired of it.
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The yellow and black wires connect to the W and G terminals of your module. That means they're the pickup coil wires. They don't conduct enough current or voltage to burn the insulation. Something really weird is going on, or there's something else overheating the wires. I don't suspect the heat sink for the module as being hot enough to cook insulation under normal conditions.
If my distributor wouldn't stay put, I'd be looking at the hold-down bolt for being too long--jamming against the bottom of the bolt hole instead of clamping the hold-down, and I'd make sure there was a fresh distributor gasket between Mister Distributor and the block. Less likely--are the bushing in the distributor housing overly-tight? Have you actually checked to see if you can move the distributor when the hold-down bolt is tightened? That might determine whether the timing shift is mechanical or electronic.
There's the wild, outside chance that the damper outer ring is moving around, or the vacuum advance doesn't move smoothly, so it jams in semi-random places/patterns..