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Edelbrock off road needles and seats

BizeeB65 said:
Is this an attempt at a thread hijack? :eek1:

J/K man. Sounds like you might have a sticky float?? I would take the carb off and give it a good cleaning. You might wanna post up a new thread too... get more responses that way.
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sorry about that i didnt even think about that before i made that post my appologies guys!
 
Holy Crap.... I ordered my stuff from summit yesterday morning, and it came this afternoon!!!! WOOT. Def worth 10 bucks 'handling' fee. Now, to rip the carb off....
 
theperfectgarage said:
Depending on how much your doing, no need to remove the carb.
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Well, with 6" of lift I have to stand on the bumper to do anything under the hood. Not so comfortable working environment either (outside). So, it would be easier to pull and work on it in my garage. Thanks for the heads up though. I sure hope this works like ya'll say it will.
 
Well, I got the carb off and apart, and put on the new needles and seats. I also recalibrated the float levels (7/16, 1-1/4 drop), and blocked off the channel between the bowls. It got dark, and chilly out, so I had to quit for the night, but gonna try and finish up tomorrow. If this works, it probably will be the easiest tune I've done with the greatest results off road so far. Keeping my fingers crossed. I know I have good advice from fellow CK5ers, so Im sure I will see a difference. I'll keep ya posted.
 
I would think that the only effect on the street would be better fuel efficiency?? But that is just a theory. It seems that I had to set up the floats to have a more specific range of travel, making the fuel in the bowls more constant.

So i really dont know if there is any effect on street performance.
 
Performance should only be changed with a jet change. Resetting the float level should only affect the level of fuel in the bowl.
 
BizeeB65 said:
Well, I got the carb off and apart, and put on the new needles and seats. I also recalibrated the float levels (7/16, 1-1/4 drop), and blocked off the channel between the bowls. It got dark, and chilly out, so I had to quit for the night, but gonna try and finish up tomorrow. If this works, it probably will be the easiest tune I've done with the greatest results off road so far. Keeping my fingers crossed. I know I have good advice from fellow CK5ers, so Im sure I will see a difference. I'll keep ya posted.
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Float drop, 15/16" to 1".
 
jiminycricket said:
Is that what you set yours at? The Edelbrock carb manual calls for a 7/16ths setting.
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The 7/16 is the float all the way up. That's like your holding the top of the carb upside down. The float drop is how far the float hangs down in it's normal position,
 
So I installed the needles and the seats, and a fuel regulator (set to 4), and she started right back up. However, after warmup, there is a big hesitation now when I give it throttle from a standstill, almost to the point of a complete stall out. No other real hesitations throughout the throttle. Runs fine wide open, and idle's fine. Do i need to adjust the rod location on the pump arm (top right of carb, looking at engine)? I dont understand why else it would have this hesitation now, if I only changed the rate at which the bowls fill up. Any ideas?
 
What did you set your floats at?

I did the install today and am having an lean idle issue.
 
I set it to specs from the link on edelbrocks page. 7/16 and 1 1/4 drop. I am not sure how to tell if I am running lean now or what... Doesnt a hesitation mean that I am runnin lean?
 
BizeeB65 said:
I set it to specs from the link on edelbrocks page. 7/16 and 1 1/4 drop. I am not sure how to tell if I am running lean now or what... Doesnt a hesitation mean that I am runnin lean?
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Ahh... the joys of carb tuning.
One of the toughest parts of carb tuning is that a givin symptom can indicate both lean or rich, figuring which it is is the hard part. Especially sense we don't have five gas exhaust analyzers in our toolbox'es.
This big hesitation, Is it just when leaving easy or if you drop the hammer hard? Is underhood smelling like raw gas ( flood ) right after? Man, this sucks, all the offroad kit is for is to limit the float bouncing the needle on rough surfaces. I'm bouncing back and forth between you and J criket and I'm not coming up with much.
The first thing that gets fuel to her is your accelerator pump and you can try and change the linkage hole on that for a bigger pump shot, but it makes no sense to me why this should be required in this situation. I'm puzzled.
keep messing and posting I'll be watching.
 
theperfectgarage said:
Ahh... the joys of carb tuning.
One of the toughest parts of carb tuning is that a givin symptom can indicate both lean or rich, figuring which it is is the hard part. Especially sense we don't have five gas exhaust analyzers in our toolbox'es.
This big hesitation, Is it just when leaving easy or if you drop the hammer hard? Is underhood smelling like raw gas ( flood ) right after? Man, this sucks, all the offroad kit is for is to limit the float bouncing the needle on rough surfaces. I'm bouncing back and forth between you and J criket and I'm not coming up with much.
The first thing that gets fuel to her is your accelerator pump and you can try and change the linkage hole on that for a bigger pump shot, but it makes no sense to me why this should be required in this situation. I'm puzzled.
keep messing and posting I'll be watching.
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Thanks man... I am limited on daylight here once I get off work, so I was only able to mount it and test drive it tonight. The hesitation happens when I ease into it and when I drop the hammer, both from a stop... I have to pump the pedal once or twice to keep it from stalling, then once I am moving she does fine, except she feels less powerful than before with the hammer down. Doesnt a real lean mixture create less power?? (I am trying to remember all my carb tuning... its been a while...)

I will be tinkering with it this weekend, so I will make some changes and let you know what happens (all suggestions welcome). The only thing else I can think of is that some dirt or something got into one of the jets or a hole somewhere during the needle changing process. I tried to clean as much as I could with carb spray, but who knows. That thing has prolly been on there for 15 yrs with no cleaning. I might try to spray it down again with the truck running, just to make sure there is no clogs or whatever before I start changing settings. Again, I appreciate your help!
 
For sure on the cleaning part, the weekend will give you more time and light. And yes, if she feels weaker overall it's lean. Put in a pair of the silver step up springs ( stiffest ) and let me know what that does.
 
Here's some good info to save me a bunch of typing. I have modded many Carter AFB/Edelbrock performer carbs as described here:http://www.ih8mud.com/tech/carter.php.
The mods work good. It will never be as good as a Q-jet. But offroad performance of the AFB/EDL is vastly improved.

As for the hesitation.. Sounds like you are running lean. Re check float level. Give a bigger accelerator pump shot. Also make sure if you blocked off the passage between the float bowls that a little air can pass between them. other wise a slight vaccum can develope in the float bowls and lean out the FA mixture. The vaccum line cut in half as described in link I posted works good. The small hole Allows the bowls to have equal atmospheric pressure. but doesn't allow much fuel to slosh around.
 
Just an FYI for anyone following this thread.

The Edelbrock tech e-mailed today with the following float setting recommendations.

7/16 top of float to airhorn gasket with a 1 1/4 drop.

This directly conflicts with the Carb user manual offroad needle and seat section which states:

7/16 with a 15/16 to 1 inch drop.

There are also 2 conflicting float settings on their web site. One for 3/8 & 1 1/4 and the other for 7/16 & 1 1/4.

In the end I went with the carb manual and used the 7/16 & 1 inch setting.

The tech made no attempt to explain the discrepancies which I pointed out in my e-mail to him. So, there you have it. Edelbrock tech at it's best. If I have any additional problems with the float setting I'll post them.
 
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