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Old 11-06-2004, 07:01 PM
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Strange problem with ignition......

Well today, dad and I finished up the fuel line project. We installed all new braided hoses, hose ends, canister style fuel filter, aeromotive regulator etc.... Whats funny is that before we started this project we fired up the car and noticed that it was backfiring through the left bank. My first guess was timing. Which was correct. I reset the timing to 14degrees BTDC, and it seemed to run fine. But, and this is where it gets wierd, when you rev the engine, without the vacume advance line on it will still advance the timing. When you hook the vaccume advance line up the timing acts like its all outa whack, like its getting too much advance. Would the distributor be the culprit in this case?

Here are my engine specs:

383 cid
lunati bracket master .515/.515
Dart sportsman heads
Edelbrock 650cfm
Edelbrock Torker Intake.
Accel HEI Distrib.

Any help would be much appreciated.

Also too, when I was timing the engine this afternoon, I noticed that the #1 cyl wouldn 't always hit. Could it be the cap/rotor and module?


Thanks so much for the help.

Tim

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Old 11-06-2004, 08:44 PM
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When you rev the engine, the centrifugal weights inside the distributor advance the timing. When you connect the vacuum advance at idle, it will add more timing to your initial setting, if you are connected to a manifold vacuum source.

I don't want to get into the pros and cons of manifold vs ported vacuum. This has been discussed again and again...with no apparent concensus among the members.

The miss on #1 could be the cap, wire, or plug. Pop the cap and look at the #1 terminal for unusual wear.
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Old 11-06-2004, 09:08 PM
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Thanks for the reply, I will take a look at that tomorrow.
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Old 11-07-2004, 08:43 PM
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Well we replaced the cap, coil, and plugs, which seemed to fix the problem. Now the timing is pretty much fooked. Im going to retime it some time this week. Any good suggestions on timing a performance engine like ours?
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Old 11-07-2004, 10:29 PM
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I would start at about 12-14 degrees advanced with the vacuum advance disconnected and plugged. That should put you in the ball park.
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Old 11-08-2004, 06:25 AM
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Cool, thanks for the help again.
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