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Old 04-29-2003, 08:58 PM   #1
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which vacuum line is for timing on an edelbrock carb?

there are 2 vacuum ports on the front, which one is for the timing?
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Old 04-29-2003, 09:09 PM   #2
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should be the one on the passenger side. the one that's higher up from hte base of the carb. it has no vacuum at idle.
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Old 04-29-2003, 09:40 PM   #3
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Uh...... you DO want vacuum at idle for a vacuum advance dist.

Why else would it be called vacuum advance?

I don't recall which one it is, but if you have a vacuum gauge it's easy to find. Hook it up and if there's vacuum at idle, but none when you quickly open the carb to wide open throttle, then that's the one you want.

It's been so long since I've messed with one I don't remember which one it is exactly.
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Old 04-29-2003, 10:59 PM   #4
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I don't recall which is which offhand. With the car at idle, just uncap them one at a time. One will have vacuum, the other will not. Once you know which one does not, you've got it.
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Old 04-30-2003, 12:59 AM   #5
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It's the one on the passenger side. You don't HAVE TO HAVE vaccum hooked up to the distributor by the way. But if it's there, use it!
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Old 04-30-2003, 06:24 PM   #6
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Quote:
Originally posted by AJ_92RS
Uh...... you DO want vacuum at idle for a vacuum advance dist.

Why else would it be called vacuum advance?

I don't recall which one it is, but if you have a vacuum gauge it's easy to find. Hook it up and if there's vacuum at idle, but none when you quickly open the carb to wide open throttle, then that's the one you want.

It's been so long since I've messed with one I don't remember which one it is exactly.
uh NO you don't want vacuum at idle there skippy. learn something here today. at idle you do not want the vacuum. as the rpm's increase, the vacuum will rise. then it will advance as the vacuum rises. if you put it on the full time vacuum, it will fully advance at idle. the vacuum port is above the throttle blades, which is why there is no vacuum at idle. when the throttle blades open, it will suck through that port and create the vacuum at that point and pull the advance pot. you want timing to increase as rpms rise.

you do it your way and you reverse the mechanism operation. at idle it will add all the timing. then when you open the throttle blades it will retard the timing.
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Old 04-30-2003, 08:27 PM   #7
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thanks guys
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Old 04-30-2003, 09:41 PM   #8
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Did you get it hooked up? How's it running?
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Old 05-01-2003, 01:58 AM   #9
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OK... here's a pic I found at (can you guess?) www.edelbrock.com

As you'll see, the port on the passenger side is for Timed Vacuum Port for emission controlled vehicles.

The one on the driver's side is for Manifold Vacuum Port for non-emission controlled engines.

Here are some instructions that they give.

Quote:
Before Removing Old Carburetor
Determine if the distributor vacuum advance it timed (no vacuum at idle) or full (vacuum present at idle).
With the engine fully warmed up and idling, pull the vacuum hose off of the carb and "feel" for vacuum by putting your finger on the vacuum port. If your distributor has timed vacuum advance, hook the distributor vacuum hose up to the passenger side vacuum port on the carburetor. If it has full vacuum advance, hook it up to the driver's side vacuum port.
That should clear it up for ya.

I guess it really revolves around what type of distributor you have. I've always had ones that used a full vacuum source, so there was vacuum at idle, but slowly diminished as the RPM increased.

mrr23 has obviously used more timed vacuum advance systems.

So I guess we both were right..... but now you have to find out what system YOU have.
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Old 05-01-2003, 12:24 PM   #10
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well i hokked it up to the passenger side, it has vacuum at higher rpm's, the other one always has vacuum, my distributor is vacuum advance. with it hooked up to the passenger side now, i just dont feel the power, i think ill try the drivers side then?
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Old 05-01-2003, 12:29 PM   #11
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I believe the only difference between the two ports occurs at idle. Off idle, ported vacuum is the same as manifold vacuum. I don't see why it would give you a lack of power. All that hooking it up to the other port will do is give you more advance at idle. Is this a new carb installation, or did you just have to remove it for something and are putting it back on?
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Old 05-01-2003, 03:50 PM   #12
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Yea.. Mike's right. There shouldn't be any difference when you push the go pedal. Seems as though you've got other problems besides the vacuum advance.

The only difference with the two is vacuum at idle. I've always used the driver's side because every car I've ever had a carb on had a radical cam and it just idled better.
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Old 05-01-2003, 07:17 PM   #13
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yes there are both types of distributors. emmisions years started as early as 1973. but my 79 z28 needed the part time vacuum. what you may want to do is find a vacuum diagram for the engine the distributor came from. you will find very few of the full time advance distributors.
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Old 05-01-2003, 07:50 PM   #14
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Quote:
Originally posted by mrr23
yes there are both types of distributors.
There's no real difference in the distributors apart from the advance curves, which is the first thing everyone changes anyway.
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Old 05-01-2003, 08:06 PM   #15
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ok i'll clarify for you. there are 2 types of vacuum advance pots. one where it advances as vacuum increases. and the other that advances as vacuum decreases. that is what needs to be found out. and even then some pots have a 10* advance and some have a 16* advance. usually the mechanical advance part has 10* capability. but again most will be the one that advances as vacuum increases.
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Old 06-02-2010, 02:32 PM   #16
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Re: which vacuum line is for timing on an edelbrock carb?

I know that this post is very old. But i have a problem with the car dying when put into gear its a camaro and was computerized.. i had to put a lock up kit on the transmission was wondering what side what went to. i'd like to have my car run properly. any help would be apprecitated.
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Old 06-02-2010, 02:32 PM
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