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Old 07-05-2007, 01:09 PM
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timing light chaos

when using amy timing light, i see two distinct white lines not one. what could cause that to happen? if memory serves the marks seem to be about 4 degrees apart (give or take). thanks to anyone who can help.

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Old 07-05-2007, 03:07 PM
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Are you running an MSD ignition system ??
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Old 07-05-2007, 03:14 PM
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The mark to the left would probably be TDC and the mark to the right would be "X" degrees of advance. Without verifying TDC on the damper ring though, that's just a guess.

If you want to verify the ring/pointer but don't understand how, just ask and I'll walk you through it. You'll need a piston stop tool and a degree tape that fits the ring diameter.
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Old 07-06-2007, 09:52 AM
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I dont have an msd ignition. some particulars: crane fireball points eliminator, pertronix 40k v coil, and an adjustible advance timing light. also thanks for the help guys. as far as one mark being tdc and the other being advance sounds plausible, but the marks dont seem to seperate as i vary the timing by turning the distributer. i have been using the top timing mark (far right as to not over advance), but that theory is bunk because i dont know why i have two timing lines.
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Old 07-06-2007, 01:52 PM
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Are you only seeing these two lines when you're using the light? Did you shut the engine off to see if there are two lines actually scribed in the balancer?
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Old 07-06-2007, 03:29 PM
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the lights(lines) are definately a product of the timing light. i say that the lines appear only when the timing light is on. the only thing i can think of is being a corvette the battery is behinf the drivers seat ( way to go GM), so i hook up the positive lead to the positive lead on my coil. do i have a faulty timing light? or can this be caused by a mechanical fluke?
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Old 07-06-2007, 03:54 PM
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Or you could be getting a transient voltage from another wire? I do have one of those lights and I would suspect it. I have about a half roll of tape locking and covering the dial. Got another you can put up against it?
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Old 07-06-2007, 04:10 PM
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I dont have a nother light to test it with. when you say: "tape covering the dial", are you reffering to the inductive clamp which goes onto/around #1 plug wire? does that help? if so, im ready with the tape.
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