Re: holey carb ??
[Re: RobX4406]
#1277615
08/01/12 04:40 PM
08/01/12 04:40 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What Rob said. float level, waterlogged float, psi too high, bad needle/seat or maybe its O ring. Screw the on the side of the metering block mixture screws in & if it doesn't die the power valve is likely blown. Either case check the PV gasket (torn or wrong one) EDIT check the float thru its' range of travel and the tang that contacts the needle
Last edited by RapidRobert; 08/01/12 04:55 PM.
live every 24 hour block of time like it's your last day on earth
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Re: holey carb ??
[Re: RapidRobert]
#1277616
08/01/12 07:46 PM
08/01/12 07:46 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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First of all, what if the List number of your carb?
80770 or 90770?
Street or Truck Avenger?
Burning eyes means the carb is supplying too much fuel. At idle your main jets should not be involved with the fuel supply at all. Also, your jets should be very close to right on. I agree with the others that you have another problem.
First thing I'd suggest is to take out your needle and seat assemblies and make sure they are working properly. Then carefully set the float level.
At this point you may try to measure fuel line pressure as if it is too high it'll overpower the float and you'll have fuel injection!
The Avenger carbs have power valve protection built in, but try the old trick of turning in the idle mixture screws all the way at idle and seeing if it dies or not. Don't go overboard, just a light finger tight should do it. If the truck doesn't die, change out the power valve. I'd suggest something around a 6.5 or lower.
Go to Holley.com and find the Avenger instructions, there you will find what jets come stock in the carbs, also the power valves.
I hope that when you get the float and fuel pressure setting right, your problem will go away. But if it doesn't, perhaps there is a piece of dirt in the idle air bleed(s). Time to clean out all the passages with a good blast of carb cleaner.
I love my 570 Street Avenger and will be putting a 770 Street Avenger on my 400-inch $500 ford truck. I wish you luck sorting yours out.
R.
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Re: holey carb ??
[Re: dogdays]
#1277617
08/02/12 01:16 AM
08/02/12 01:16 AM
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Joined: Jul 2004
Posts: 4,732
Watertown, WI
MikeyT
master
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master
Joined: Jul 2004
Posts: 4,732
Watertown, WI
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One other thing is to make sure the idle blade and secondary blad adjustments are right.
I recently found that my carbs adjustment blades were way out of sorts, causing a similar issue and needed to be set right before it would go right.
Also the air/fuel screws should be out 1-1 1/4 turns on each side.
mike
1969 Dodge Dart Swinger
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Re: holey carb ??
[Re: dogdays]
#1277618
08/02/12 01:51 AM
08/02/12 01:51 AM
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Joined: Jan 2003
Posts: 6,816
Alton, IL
Dakota_Don
OP
master
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OP
master
Joined: Jan 2003
Posts: 6,816
Alton, IL
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Quote:
First of all, what if the List number of your carb?
80770 or 90770?
Street or Truck Avenger?
street,
Burning eyes means the carb is supplying too much fuel. At idle your main jets should not be involved with the fuel supply at all. Also, your jets should be very close to right on. I agree with the others that you have another problem.
First thing I'd suggest is to take out your needle and seat assemblies and make sure they are working properly. Then carefully set the float level.
At this point you may try to measure fuel line pressure as if it is too high it'll overpower the float and you'll have fuel injection!
The Avenger carbs have power valve protection built in, but try the old trick of turning in the idle mixture screws all the way at idle and seeing if it dies or not. Don't go overboard, just a light finger tight should do it. If the truck doesn't die, change out the power valve. I'd suggest something around a 6.5 or lower.
Go to Holley.com and find the Avenger instructions, there you will find what jets come stock in the carbs, also the power valves.
I hope that when you get the float and fuel pressure setting right, your problem will go away. But if it doesn't, perhaps there is a piece of dirt in the idle air bleed(s). Time to clean out all the passages with a good blast of carb cleaner.
I love my 570 Street Avenger and will be putting a 770 Street Avenger on my 400-inch $500 ford truck. I wish you luck sorting yours out.
R.
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Re: holey carb ??
[Re: dogdays]
#1277619
08/02/12 01:55 AM
08/02/12 01:55 AM
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Joined: Jan 2003
Posts: 6,816
Alton, IL
Dakota_Don
OP
master
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OP
master
Joined: Jan 2003
Posts: 6,816
Alton, IL
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Quote:
First of all, what if the List number of your carb?
80770 or 90770?
Street or Truck Avenger?
Burning eyes means the carb is supplying too much fuel. At idle your main jets should not be involved with the fuel supply at all. Also, your jets should be very close to right on. I agree with the others that you have another problem.
First thing I'd suggest is to take out your needle and seat assemblies and make sure they are working properly. Then carefully set the float level.
At this point you may try to measure fuel line pressure as if it is too high it'll overpower the float and you'll have fuel injection!
The Avenger carbs have power valve protection built in, but try the old trick of turning in the idle mixture screws all the way at idle and seeing if it dies or not. Don't go overboard, just a light finger tight should do it. If the truck doesn't die, change out the power valve. I'd suggest something around a 6.5 or lower.
Go to Holley.com and find the Avenger instructions, there you will find what jets come stock in the carbs, also the power valves.
I hope that when you get the float and fuel pressure setting right, your problem will go away. But if it doesn't, perhaps there is a piece of dirt in the idle air bleed(s). Time to clean out all the passages with a good blast of carb cleaner.
I love my 570 Street Avenger and will be putting a 770 Street Avenger on my 400-inch $500 ford truck. I wish you luck sorting yours out.
R.
thats kinda why i took it apart is to clean it in case its dirty.. it has a new stock small block pump.. approx 5-6 psi.. and i can screw in the mix screws and it will still run.. im looking for dirt,cracks or bad pwr valve.. so gotta be something simple..
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Re: holey carb ??
[Re: Dakota_Don]
#1277622
08/02/12 07:41 PM
08/02/12 07:41 PM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
called holley today, to start it had the wrong power valve.. so im gonna clean it, install new parts .. set it at original settings and start from there..
What a waste of time holley tech is. Doesn't matter if it's got a 2.5 or a 10.5 power valve, you've got 14 inches of vacuum.
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Re: holey carb ??
[Re: mopar_leaner]
#1277624
08/03/12 12:18 AM
08/03/12 12:18 AM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
also make sure you have a New fuel filter, because the smallest particle can cause the needle and seat to stick open and with the air cleaner off and the engine idling, you should see raw fuel drizzling off the boosters.
You sure about that or did you mean he "should not"...
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Re: holey carb ??
[Re: RobX4406]
#1277625
08/03/12 12:46 AM
08/03/12 12:46 AM
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Joined: Sep 2006
Posts: 150
Illinois
fishy68
member
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member
Joined: Sep 2006
Posts: 150
Illinois
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Don I have a 408 that is similar to yours (just a tad larger cam) and at first I had a 770 Avenger on it and it ran real good but I did have to jet it up 2 sizes in front and 5 in the rear. As Rob said Holley's tech lacks a lot to be desired. I'd like to know why they said you had the wrong power valve in it cause if you've got 14 inches of vacuum that's plenty to hold a 8.5 PV shut. IMO the 8.5 is just about perfect for it. I'm only about 35 miles from you so if you have trouble getting it worked out let me know and I can take a spin down and have a look. Just PM me for my ph. # and we'll get hooked up.
68 Cuda 408/904/8-3/4
02 Dakota 4.7 auto
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Re: holey carb ??
[Re: fishy68]
#1277626
08/03/12 01:11 AM
08/03/12 01:11 AM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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My guess.
Idle is high, mechanical timing is bleeding in, won't idle in gear because it pulls that timing out at lower idle speed. i bet it drops a big amount in gear, 250+ rpm?
I'd put a timing light on it, see where initial lies in gear. Or turn the idle down to 850 and see where it is. If it drops any, you need to reset it. Advance the timing some and see if the idle can be turned down. It's in the transfer slots and you MUST have control of mixture via the metering block screws. If not, you're DONE! Until you get it out of the transfer slots, it will never stop gassing out the neighborhood.
That engine should idle easily at 800 rpm if you wanted it that low. I'd set it around 900 rpm with plenty of initial timing. 16 is a good start, might want more.
As far as the power valve goes, two PV gaskets have caused issues before.
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