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clogged idle air bleed (update)!!!! #510064
10/28/09 05:37 PM
10/28/09 05:37 PM
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what will a clogged idle air bleed do?

A. make the idle circuit rich
B. stop the fuel to the idle circuit

Re: clogged idle air bleed [Re: Quicktree] #510065
10/28/09 05:41 PM
10/28/09 05:41 PM
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Richmond Va, KeislerTKO 60...
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A

Re: clogged idle air bleed [Re: VanishPt] #510066
10/28/09 05:52 PM
10/28/09 05:52 PM
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Rock Springs
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Quote:

A




All it controls is air...you know this Tony, this a trick question?..


[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
Re: clogged idle air bleed [Re: Bob_Coomer] #510067
10/28/09 05:57 PM
10/28/09 05:57 PM
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Quote:

Quote:

A




All it controls is air...you know this Tony, this a trick question?..




no

Re: clogged idle air bleed [Re: Quicktree] #510068
10/28/09 06:06 PM
10/28/09 06:06 PM
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Mt.Vernon ,Ohio
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should do both..the air being pull though the air bleed pull fuel out also. no air flow ,no fuel flow

Post deleted by Defbob [Re: Quicktree] #510069
10/28/09 06:06 PM
10/28/09 06:06 PM

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Re: clogged idle air bleed #510070
10/28/09 06:21 PM
10/28/09 06:21 PM
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Mt. Vernon, Ohio
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The smaller the bleed the richer the circut, the larger the bleed the leaner the circut,, in my opinion if one is plugged it will go dead rich.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: clogged idle air bleed [Re: dartman366] #510071
10/28/09 06:22 PM
10/28/09 06:22 PM
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Quote:

The smaller the bleed the richer the circut, the larger the bleed the leaner the circut,, in my opinion if one is plugged it will go dead rich.




how would it pull fuel with no air?

Re: clogged idle air bleed [Re: Quicktree] #510072
10/28/09 06:28 PM
10/28/09 06:28 PM
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SW Ohio
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The idle passage is a slot just below the throttle plates when closed. Engine vacuum pulls fuel through the idle fuel restriction then the air bleed mixes air. The air bleed will mix air with the fuel so it is not "solid". Same with the hi speed bleed with fuel being pulled up the main well.

Re: clogged idle air bleed [Re: AAR-B4] #510073
10/28/09 06:30 PM
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Quote:

The idle passage is a slot just below the throttle plates when closed. Engine vacuum pulls fuel through the idle fuel restriction then the air bleed mixes air. The air bleed will mix air with the fuel so it is not "solid". Same with the hi speed bleed with fuel being pulled up the main well.




so your saying it will pull fuel reguardless if the bleed is clogged or not?

Re: clogged idle air bleed [Re: Quicktree] #510074
10/28/09 06:33 PM
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SW Ohio
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Yes, but it will not be pre-mixed with air. It will idle rich.

Re: clogged idle air bleed [Re: AAR-B4] #510075
10/28/09 06:35 PM
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Quote:

Yes, but it will not be pre-mixed with air. It will idle rich.




well I am running into just the oppisite problem. it is way lean on tip in and I found 2 rear bleeds completely clogged.

Re: clogged idle air bleed [Re: Quicktree] #510076
10/28/09 06:38 PM
10/28/09 06:38 PM
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Rock Springs
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Quote:

Quote:

The smaller the bleed the richer the circut, the larger the bleed the leaner the circut,, in my opinion if one is plugged it will go dead rich.




how would it pull fuel with no air?




The venture still is operational, it dont care if there is another hole or not..The Restriction speeds the air up threw the venture cause a low pressure area in "said area"
Coarse Im no guru.
In other words the air, and fuel idle or high speed circuits are just that diff circuits.


[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
Re: clogged idle air bleed [Re: Quicktree] #510077
10/28/09 06:39 PM
10/28/09 06:39 PM
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Chino Valley
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Yep. Carbs work on differences in pressure. The air pressure on the top of the fuel is higher than the pressure (vacuum) below the throttle plates. This will pull fuel into the motor through the idle circuit when running.
The main circuit outlet is in the venturi, so it needs the air bleed to stop the flow. Otherwise, it will siphon all the time after the first flow is started, if the outlet is lower than the fuel level in the bowl.

Re: clogged idle air bleed [Re: Quicktree] #510078
10/28/09 06:40 PM
10/28/09 06:40 PM
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Mt. Vernon, Ohio
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Quote:

Quote:

The smaller the bleed the richer the circut, the larger the bleed the leaner the circut,, in my opinion if one is plugged it will go dead rich.




how would it pull fuel with no air?


The bleed is to air as the jet is to fuel, as bleed size is increased the air fuel ratio become's leaner, as the bleed is decreased it become's richer , so if it were plugged it would pull pure fuel as opposed to air emulsed fuel.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: clogged idle air bleed [Re: Quicktree] #510079
10/28/09 06:44 PM
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SW Ohio
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The idle bleeds are towards the outside, the hi speed are close to the squirter. The idles' should have a larger hole than the hi speed.

Re: clogged idle air bleed [Re: Quicktree] #510080
10/28/09 06:47 PM
10/28/09 06:47 PM
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Chino Valley
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Quote:

Quote:

Yes, but it will not be pre-mixed with air. It will idle rich.




well I am running into just the oppisite problem. it is way lean on tip in and I found 2 rear bleeds completely clogged.





http://www.carcraft.com/howto/ccrp_0507_carb_tuning_tips_tricks/photo_12.html

Tip in is
1. Idle circuit. If this is fine at idle, this is not the cause.
2. Transfer port. This is checked by holding the throttle open slightly (idle + 200 RPM) to see if it's lean there. Most 70s-up stock carbs are a bit lean here.
3. Accelerator circuit. This will show up at any RPM, but be more noticable at low RPM. Do you have issues at say 30 MPH?
4. Main circuit. This should start to work at ~1400 RPM. You can see this by looking down the throat. WARNING! lean pop may catch you in the face!
5. Power circuit. When it's a quick tip in, the vacuum drops enough to open the power circuit. If it is needed but does not work, this will also be a flat spot.

Last edited by RodStRace; 10/28/09 06:51 PM.
Re: clogged idle air bleed [Re: RodStRace] #510081
10/28/09 06:55 PM
10/28/09 06:55 PM
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Quote:

Quote:

Quote:

Yes, but it will not be pre-mixed with air. It will idle rich.




well I am running into just the oppisite problem. it is way lean on tip in and I found 2 rear bleeds completely clogged.





http://www.carcraft.com/howto/ccrp_0507_carb_tuning_tips_tricks/photo_12.html

Tip in is
1. Idle circuit. If this is fine at idle, this is not the cause.
2. Transfer port. This is checked by holding the throttle open slightly (idle + 200 RPM) to see if it's lean there. Most 70s-up stock carbs are a bit lean here.
3. Accelerator circuit. This will show up at any RPM, but be more noticable at low RPM. Do you have issues at say 30 MPH?
4. Main circuit. This should start to work at ~1400 RPM. You can see this by looking down the throat. WARNING! lean pop may catch you in the face!
5. Power circuit. When it's a quick tip in, the vacuum drops enough to open the power circuit. If it is needed but does not work, this will also be a flat spot.




this is a 3 circuit dominator I am talking about.

http://holley.com/data/Products/Technical/199R9786-2.pdf

Re: clogged idle air bleed [Re: Quicktree] #510082
10/28/09 07:22 PM
10/28/09 07:22 PM
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interesting topic, does anybody know what stock air bleeds comes on a 8896-2 dominator? I cant find it on holley's site

Re: clogged idle air bleed [Re: Quicktree] #510083
10/29/09 05:47 AM
10/29/09 05:47 AM
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Detroit, MI
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it will still flow fuel and it will be rich'er' at certain flow-rates...

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