For those running edel carb and orig type distributor? - Vintage Mustang Forums
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post #1 of 22 (permalink) Old 11-29-2018, 10:30 AM Thread Starter
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For those running edel carb and orig type distributor?

Which vacuum port are you guys using; full or ported?








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post #2 of 22 (permalink) Old 11-29-2018, 10:34 AM
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Which vacuum port are you guys using; full or ported?








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post #3 of 22 (permalink) Old 11-29-2018, 10:40 AM Thread Starter
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thanks Bill.





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289; .30 over bore; Weiand intake, 500 cfm 4bbl carb; re-curved dizzy;
Lowering coil springs on front; reverse eye leafs,
2.25 tri-y's; H-pipe; 40 flowmaster, trans-go shift kit.
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post #4 of 22 (permalink) Old 11-29-2018, 10:41 AM Thread Starter
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Hey Bill does auto transmission matter at all ?



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289; .30 over bore; Weiand intake, 500 cfm 4bbl carb; re-curved dizzy;
Lowering coil springs on front; reverse eye leafs,
2.25 tri-y's; H-pipe; 40 flowmaster, trans-go shift kit.
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post #5 of 22 (permalink) Old 11-29-2018, 10:48 AM
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No, if you hook it up to full vacuum your timing will be advanced at idle. You do not want this.

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post #6 of 22 (permalink) Old 11-29-2018, 11:39 AM
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1967 Mustang Convertible, 289-4v, C4, Edelbrock Performer Intake, Mild Cam.
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post #7 of 22 (permalink) Old 11-29-2018, 12:20 PM
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Full manifold. Ported is/was for emissions reasons.
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post #8 of 22 (permalink) Old 11-29-2018, 12:42 PM
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Full manifold. Ported is/was for emissions reasons.
If you’re using full manifold, how much timing does that add at idle?
How does it effect mid throttle and WOT?

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post #9 of 22 (permalink) Old 11-29-2018, 12:58 PM
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Relative to a precise number on idle timing it depends on a number of factors. Both are the same at full and half throttle.
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post #10 of 22 (permalink) Old 11-29-2018, 05:09 PM
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Full manifold. Ported is/was for emissions reasons.
+1

Full vacuum!
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post #11 of 22 (permalink) Old 11-29-2018, 06:32 PM
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If youíre using full manifold, how much timing does that add at idle?
How does it effect mid throttle and WOT?
It depends on the vacuum canister but it could pull in as much as 60*. The difference between ported and full manifold vacuum is manifold vacuum comes from below the throttle plates. Ported come right at the plate. At idle the throttle plate blocks the port so itís not exposed to vacuum. Once the throttle is moved, itís exposed to manifold vacuum. In the early days of emissions the priority over everything else was to meet emissions with engines never designed for low emissions. Idle is the dirtiest point so the engineers altered timing to fire very late so the exhaust gases would be burning in the exhaust manifold where in some cases air via a pump would be injected into the exhaust manifolds to keep the mixture burning and consume the unburned gases.

As the load increases the manifold vacuum drops and so does timing to keep detonation under control. Think of it as a mechanical computer for ignition timing. Full manifold vacuum at idle will allow for the throttle plates to be closed more at idle for reduced fuel consumption. It allows the throttle plates to closed enough for the idle circuit to function with hotter cams.

I use to work in a Chevy dealer parts dept in the mid 70ís. Before the 75 cars came out with catalytic converters, the cars ran horrible. The vacuum timing was that the engine had to be up to normal temp and in high gear only. Along with lean fuel mixture and EGR, they were gutless with poor drive ability. When the 75ís came out almost all the crap disappeared. Vacuum advance was full vacuum advance without being up to running temp or high gear. The 75ís ran so much better.

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post #12 of 22 (permalink) Old 11-29-2018, 06:36 PM
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No, if you hook it up to full vacuum your timing will be advanced at idle. You do not want this.

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Why? Before emissions it was full manifold vacuum at idle.

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post #13 of 22 (permalink) Old 11-29-2018, 06:53 PM
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Why? Before emissions it was full manifold vacuum at idle.
Honestly it is how I have always been told and read how to do it. I may learn something from this thread myself. I always wondered why everything says to use ported/timed vacuum without any explanation.

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post #14 of 22 (permalink) Old 11-29-2018, 07:11 PM
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Honestly it is how I have always been told and read how to do it. I may learn something from this thread myself. I always wondered why everything says to use ported/timed vacuum without any explanation.

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Read any of the manuals on mid 60's cars on ignition timing and thy will tell you to disconnect the vacuum line on the distributor to set timing. I grew up in this time period, 60's and 70's
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post #15 of 22 (permalink) Old 11-29-2018, 08:37 PM
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Read any of the manuals on mid 60's cars on ignition timing and thy will tell you to disconnect the vacuum line on the distributor to set timing. I grew up in this time period, 60's and 70's
Just look at the manual for an edelbrock carb. It states to hook up the distributor vacuum to the timed vacuum port. You can't trust anyone these days. lol

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