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Old 03-05-2005, 11:32 PM
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Holley 4010 idle circuit

Has anyone succesfully richened up the idle circuit on a 4010 Holley?

Mine seems to operate better with the floats one flat higher than they should be. I would like to open up the idle restrictions a couple drill sizes more.

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Old 03-06-2005, 05:42 AM
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So what's wrong with running the floats a tad higher?
As long as your not dripping fuel from the boosters and it's not pouring out the vents you should be fine.

That just makes the fuel respond to a lower signal easier.

If you want to richen the idle circuit just open the mixture screw a bit.
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Old 03-06-2005, 05:59 AM
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Screw-in air bleeds: The outside bleeds in each throttle bore and the largest in size and stamped number are the idle air bleeds. These control the air going into the metering block, mixing with fuel that has been restricted then introduced into the engine via vacuum.

The bleeds closest to the center of the carburetor, and the smaller size and number are the high speed air bleeds. These bleeds help to control the air going into the metering block and controls both the booster start up and to a lesser extent the air/fuel ratio.

The idle air bleeds can be changed to effect an overall alteration of the idle and off-idle air/fuel mixture to improve idle quality and driveability. Generally these have to be changed in .005" to .010" increments to effect a change. If there is a significant problem then larger changes can be made.

As for the high speed bleeds, not normally recommend they be changed unless there is some significant performance problems. Any changes in these can have a substantial impact on performance. Likewise, very small changes are made in this area usually in .001" increments.
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Old 03-06-2005, 06:34 AM
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I can't recall off the top of my head as we don't mess with Holley's anymore, but....Isn't the 4010 a Vacuum secondary stock replacement type carb?...I don't recall them having adjustable air bleeds in them?

I may be wrong?
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Old 03-06-2005, 07:05 AM
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It dosn't matter if they are a screw-in type, that was a example if some carbs have them ,Proform use's them. The air bleeds do still the same job.
It describes what they do and how to change the circuit.
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Old 03-06-2005, 07:30 AM
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Proform???
Do they still come with the fortune cookie in the box?

Sorry man, I've messed with that stuff and to me they rate as a major waste of time and money, right up there beside the Chinese Distributors, Chinese Rocker Arms and their Carbs.

I'd rather push a Citron than drive a American Muscle Car loaded with Chinese parts.

Given the opportunity to tell the truth about Chinese parts, you can bet I'll take it
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Old 03-06-2005, 11:34 AM
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The 4010 doesn't have air bleeds like the 4150s.

The 4010 is not a stock replacement carb. It is the "New Holley" that came out in the 80s.


It is like this one only mine is the 750 double pumper #0-84013-2.

4010

I was seeing a little bit of fuel dripping from the boosters. That is why I brought the floats back down.

It is always better to enlarge the idle feed restrictions than it is to mess with the idle air bleeds. The idle air bleeds mess with ciruit timing too much. That is another reason I would never consider the Proform bodies. They have a lot of ill-concieved "universal fit" issues.

I just don't know exactly where the idle feed restrictions are. I think they may be in with the removeable booster clusters.

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Old 03-07-2005, 07:23 PM
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Any carb guys modified these?

Anyone have a Holley book that explains idle circuit mods for the 4010?

Tech @ BG any experience with these? Do you know anyone at BG that has?
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Old 03-08-2005, 06:46 PM
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Nobody has the Holley book with info on modifying the 4010s? I just need to know where to enrich the idle a little.
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Old 03-09-2005, 09:34 AM
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http://www.bob2000.com/carb.htm hope this helps
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Old 03-09-2005, 10:19 AM
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4010

Illuciano,

It's been 10 or so years since I've even looked at one of those things. I thought I might have one in a scrap pile, but all that stuff was trashed years ago when we stopped playing with those things.

To richen up the idle you're either going to have to restrict the idle air that gets to the circuit, or open up the fuel restrictor size. Without looking at one I couldn't get more specific. If you'll call Holley there may be someone there who can help you.
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Old 03-09-2005, 06:31 PM
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I don't know where the restrictions are on it. I guess I will have to take the clusters out and see if I can figure it out.
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