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  #46 (permalink)  
Old 03-27-2013, 02:11 PM
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Just enough. Sounds to me you are running under 10" at idle and 7" in gear.

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  #47 (permalink)  
Old 03-27-2013, 03:36 PM
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To b honest I have no Idea do I plug a vacuum gauge to the carb??? All I kno it's a enough to keep vacuum brakes and power steering
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Old 03-27-2013, 03:40 PM
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Quote:
Originally Posted by F-BIRD'88 View Post

vac secondaries do not work on manifold vacuum at all.
.
Okay that is the second person to say this.

If you drill a big hole in the manifold, your carbs secondary, or the carb for that matter is not going to pull fuel. So manifold vacuum is the signal that makes the carb function. Or the negative pressure underneath the carb to simplify it even more.

I think you are having a problem because of a comment I made about my engine. That I had described the idle with a unit of vacuum and where I measured this.

I have worked with carbs for years of all types. To say that it would have opened all the way racing, and NOT stumbled at cruise, is a bold statement.

The port for the pod is at the venturi. Of coarse , that is the best place to get a signal for the pod.

To say that the vacuum underneath the carb don't have anything to do with operation, now said twice, is not believeable.

Last edited by spinn; 03-27-2013 at 03:51 PM.
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  #49 (permalink)  
Old 03-27-2013, 03:58 PM
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What happen to the manifold vacuum when you floor the gas pedal. It drops to zero or close to it.
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Old 03-27-2013, 04:08 PM
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It goes to 9 lbs of boost.

LG, Are you going to explain your comment?

A venturi does not generate vacuum. It pulls a fluid.

A nozzle on a garden hose , when you open it. The water pressure comes from the faucet not the spray nozzle.
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  #51 (permalink)  
Old 03-27-2013, 04:11 PM
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Quote:
Originally Posted by prettyboyced View Post
Do I change to springs to limit mech advance or weights
Neither. If you have a GM hei, info on limiting the mechanical advance, as well as timing info in general, is here.

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To b honest I have no Idea do I plug a vacuum gauge to the carb??? All I kno it's a enough to keep vacuum brakes and power steering
To check the vacuum, connect a vacuum gauge to a FULL TIME vacuum source, also called "manifold" vacuum. A manifold vacuum source can be located on the carb (on the baseplate of a Holley), OR from a port located on the runner of the intake manifold.

The 'other' type of vacuum signal is called "ported" vacuum. Ported vacuum is absent (or nearly so, depending on how far the primary throttle blades are opened to set the idle speed) w/the throttle blades closed because of where the vacuum orifice is located in the carb (above the throttle plates), and will only be present when the throttle blades are opened to some degree. On a Holley, ported vacuum port is the one located on the metering block.
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  #52 (permalink)  
Old 03-27-2013, 04:17 PM
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Quote:
Originally Posted by spinn View Post
It goes to 9 lbs of boost.

LG, Are you going to explain your comment?

A venturi does not generate vacuum. It pulls a fluid.

A nozzle on a garden hose , when you open it. The water pressure comes from the faucet not the spray nozzle.
I'm gone.....Goodby
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  #53 (permalink)  
Old 03-27-2013, 04:23 PM
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Look in my journal I run a roots blower.

What?

Please explain the secondary not needing vacuum. I feel like im not hearing something, but your quotes speak for themselves.
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Old 03-27-2013, 05:44 PM
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A venturi is a fluid design used to accelerate one fluid group to move another.

You are accelerating the air moved by the piston to pull fuel.

Are we there yet?
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Old 03-27-2013, 06:23 PM
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Ill give you some rope to try and hang me.

The signal for the secondary pod on a vacuum secondary carb, takes its metering above the venturi . This is to get a slower delayed signal. This keeps the pod from opening too fast. The signal is slower because it takes more time for the air to go through a size decreasing opening, than the air around it.

Okay, Fbird ...hit me.
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  #56 (permalink)  
Old 03-27-2013, 06:47 PM
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Quote:
Originally Posted by lg1969 View Post
What happen to the manifold vacuum when you floor the gas pedal. It drops to zero or close to it.
more rope- You weren't going to imply the engine does not continue to pull. Just the opposite . The vacuum reading is negative volume yet to be consumed. Wide open it is still pulling , but there is no negative pressure left in a chamber to be read as a vacuum signal.
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  #57 (permalink)  
Old 03-27-2013, 08:23 PM
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Do like , what FBird says, first recurve the distributor, what kind of air breather do you have? that cam would probably work better with a single plane intake, with that 3500 stall torque conveter.what kind of exhaust do you have ? to restrictive could be a problem , get it tuned in right ,it should really haul *****
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Old 03-27-2013, 08:54 PM
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DK, I do not have a question on set up. Are you offering tuning advice? It sounded like you are giving me tuning advice for something I built 20 years ago. I don't have it any more , but the experience of bracket racing taught me a lot.

The grand coupe performed flawlessly and how the jobber catalog suggested. It is a shame summit catalogs don't have the same reciepes section for bracket racing.

Fbird, secondaries do not work on manifold vacuum at all- So I explained how this is false.

Lg, could not verbalize his argument in a coherent manor- So I explained where the downforce comes from and how a venturi uses it.

I cant clear it up any further, without feedback.

If you are going to accuse me of being incorrect, you better be able to explain yourself.
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  #59 (permalink)  
Old 03-28-2013, 12:58 AM
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Quote:
Originally Posted by spinn View Post
DK, I do not have a question on set up. Are you offering tuning advice? It sounded like you are giving me tuning advice for something I built 20 years ago. I don't have it any more , but the experience of bracket racing taught me a lot.
He's obviously giving advice to the OP- else why would he tell you to use a single plane intake w/"that cam" and a "3500 stall torque converter"... when you have a blown engine that you made no mention of cam or stall!

Y'all need to relax. The OP doesn't even have a vacuum secondary carb. So instead of all the back and forth about something irrelevant to the OP, post something that'll help him!
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  #60 (permalink)  
Old 03-28-2013, 05:33 AM
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obviously? I would agree but nothing in this thread has been obvious.

relax?

I am pretty relaxed, and have been. The thread became a "your wrong" thing. Neither responder made clear what their point was. It sounds like they didn't like using manifold vacuum for a indication of idle quality.

There was some confusion and I stayed present. Now it looks like the confusion is gone. I kept it lite and informative.

Peace out from the chief-commander-neutron G.

Last edited by spinn; 03-28-2013 at 05:44 AM.
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