Timing Advance at Idle - Team Camaro Tech
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post #1 of 8 (permalink) Old Dec 11th, 18, 01:08 PM Thread Starter
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Timing Advance at Idle

327 4 brl (Edelbrock 1406 600 cfm). Stock cam & distributor but with a Pertronix kit in it

What is good idle vacuum (distributor vacuum plugged)?

I have it at 13 now...thinking it needs to be lower

Was measuring total advance and when I bring it to 3000 rpm I get about 30-32 degrees advance. Subtracting 13 from 32 gives me 19 degrees total advance....if I am calculating all this correctly

was wanting 34 total advance
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post #2 of 8 (permalink) Old Dec 11th, 18, 02:51 PM
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Re: Timing Advance at Idle

Your 327 will probably run nice with 36 total. Try setting it there and don't worry about the idle advance being higher, just adjust the idle back down to where you want it. It should run cooler at low rpm, and have better throttle response. Test it for pinging under load and adjust it lower if you need to.

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post #3 of 8 (permalink) Old Dec 12th, 18, 08:08 AM Thread Starter
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Re: Timing Advance at Idle

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Your 327 will probably run nice with 36 total. Try setting it there and don't worry about the idle advance being higher, just adjust the idle back down to where you want it. It should run cooler at low rpm, and have better throttle response. Test it for pinging under load and adjust it lower if you need to.
So just set timing advance at 3000 RPM to 34-36 degrees and let the idle advance be whatever it is at idle RPM?
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post #4 of 8 (permalink) Old Dec 12th, 18, 11:10 AM
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Re: Timing Advance at Idle

So your not using vacuum advance? wasn't real clear on that.

I wouldn't go much more than 12-13 or so initial timing,you might get away with as much as 15 initial but may strain your starter a bit.
Add a couple degrees to your mechanical advance to get the 34 or 36 total you're looking for,keeping 12 or so initial, then see how it runs.

If you were using vacuum advance you could have 20-25 at idle with 36 total at full throttle.

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post #5 of 8 (permalink) Old Dec 12th, 18, 01:58 PM
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Re: Timing Advance at Idle

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So just set timing advance at 3000 RPM to 34-36 degrees and let the idle advance be whatever it is at idle RPM?
yes... At least until you are ready to start dealing with a custom curve.

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post #6 of 8 (permalink) Old Dec 12th, 18, 02:07 PM Thread Starter
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Re: Timing Advance at Idle

thanks. Set the total timing at 35 and now timing at idle is 16. Runs great. Fine tuning the idle lean on the new carb

no bog, hesitation or pinging with the new adjustments.

Before the total timing was 30. The 6 degrees more sure made a diffrence
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post #7 of 8 (permalink) Old Dec 12th, 18, 07:01 PM
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Re: Timing Advance at Idle

Run 36 total with manifold vacuum. If you were hooking up a vacuum gauge, you want the highest idle vacuum you can get. I would think you should be 15-18 at idle

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post #8 of 8 (permalink) Old Dec 12th, 18, 07:16 PM Thread Starter
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Re: Timing Advance at Idle

vac is 18 at idle
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