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Unread 07-06-2013, 02:25 PM   #631
swatson454
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Modifying the idle-feed restrictors and/or idle air bleeds is a whole ton of fun (insert sarcasm). It's not a big deal if you need to go bigger but it's hard to drill a passage smaller. You'd have to drill out the fuel passage and tap it for a 4x32 pipe plug.

By reducing the main jets, there should be a change seen at the mixture screws but 86 is correct, the right way to go about it would be a change in idle feed restrictors. It's just a real PITA. Personally, I wouldn't go there. I'd go down on the mains and call it a day.

The "hillbilly tune-up" (dribbling water through the carb at 1,500 rpm) works surprisingly well for blowing carbon out of an engine.


Shawn

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Unread 07-06-2013, 02:27 PM   #632
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Quote:
Originally Posted by 2Xtreme View Post
The vac advance and not the timing?
the timing is still at the 21.8 or whatever I posted most recently..
Yeah, the vacuum advance. It won't change how much advance is given, it'll change the rate that it comes in and out.


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Unread 07-06-2013, 02:58 PM   #633
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Ok, but isn't 20-something degrees of timing kind of high???

I've done the 'hillbilly tune-up' before with Sea Foam on injected cars....
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Unread 07-06-2013, 03:02 PM   #634
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Not at an idle. Throw your light back on there and watch that timing retard when you snap the throttle.


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Unread 07-06-2013, 03:05 PM   #635
John Strenk
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Not when there is no load on the engine like at idle.

it would be interesting to see if the vacuum advance is retarding properly under load.

leave the vacuum advance off and plug the hose and try driving and see if there is any pinging.
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Unread 07-06-2013, 03:21 PM   #636
86cj74.2L
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I'll make a video of how to restrict the idle feeds at work tonight and post it.
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Unread 07-06-2013, 05:28 PM   #637
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Here is a photo for now.....


Trim the copper strand length so its not outside the gasket area. This is the preferred was to restrict the idle feed. Some will tell you to drill a hole in each throttle plate
image-3970122750.jpg

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Unread 07-06-2013, 05:44 PM   #638
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Quote:
Originally Posted by 86cj74.2L
Here is a photo for now.....

Trim the copper strand length so its not outside the gasket area. This is the preferred was to restrict the idle feed. Some will tell you to drill a hole in each throttle plate
No offense, but that looks kinda hokey....
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Unread 07-06-2013, 06:05 PM   #639
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Makes sense though.
Effectively makes the hole smaller diameter.

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Unread 07-06-2013, 06:06 PM   #640
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Quote:
Originally Posted by 2Xtreme

No offense, but that looks kinda hokey....
Only alternative is to buy a metering plate with a smaller idle feed restrictor. They are around 100 dollars and I have know clue which one has which size restrictor.

The copper isn't going anywhere pinched between the metering plate and gasket. And you should be above 1 turn out.

They do receive their fuel from the main jets but their diameter and flow is still going to be more than the size of the idle feeds even going down a few numbers.

Jet down to around 48 and see what happens. You need to jet down anyway. You may need to go lower.
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Unread 07-06-2013, 06:31 PM   #641
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Are you interested in modifying your idle feed restrictors?
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Unread 07-06-2013, 06:44 PM   #642
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Quote:
Originally Posted by swatson454
Are you interested in modifying your idle feed restrictors?
I really think its the only way to get his fuel screws above 1 turn out. My brother and I have been using the copper wire trick for years.

Its his carb. His choice.
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Unread 07-06-2013, 07:59 PM   #643
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Quote:
Originally Posted by fourbtgait
Makes sense though.
Effectively makes the hole smaller diameter.

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True.

But I have to think will all of the R&D these multi-million dollar companies do there has to be an 'engineered' way of accomplishing the same thing...
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Unread 07-06-2013, 08:13 PM   #644
86cj74.2L
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Quote:
Originally Posted by 2Xtreme

True.

But I have to think will all of the R&D these multi-million dollar companies do there has to be an 'engineered' way of accomplishing the same thing...
Then call Holley and tell them where your mixture screws are...............
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Unread 07-06-2013, 08:26 PM   #645
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Holley would tell you to drop two jet sizes and walk away. There is a better way but you have to be willing to go the extra mile. It ain't easy.



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