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Re: gas percolating issues
[Re: mickm]
#1431272
05/06/13 03:31 PM
05/06/13 03:31 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
super stock
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super stock
Joined: Jul 2011
Posts: 817
Eugene, Oregon
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I'm fighting this same problem with my Quadrajet. I have a nice Moroso phenolic spacer and I can still hear the fuel percolating after shutdown. I've seen people run flat sheetmetal heat shields that block some radiant heat from the intake, but I'm wondering if spraypainting the intake with header paint might make more of a difference. I'd rather not go the electric fuel pump route since that feels like a band-aid after the actual issue.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: gas percolating issues
[Re: Secret Chimp]
#1431273
05/06/13 04:14 PM
05/06/13 04:14 PM
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Joined: Mar 2009
Posts: 889
Oh
parksr5
super stock
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super stock
Joined: Mar 2009
Posts: 889
Oh
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Quote:
I'm fighting this same problem with my Quadrajet. I have a nice Moroso phenolic spacer and I can still hear the fuel percolating after shutdown. I've seen people run flat sheetmetal heat shields that block some radiant heat from the intake, but I'm wondering if spraypainting the intake with header paint might make more of a difference. I'd rather not go the electric fuel pump route since that feels like a band-aid after the actual issue.
Even with an electric pump, it is still an issue. I have an electric fuel pump and I have the same issue although, I'm sure the electric pump makes it a little easier to start over a mechanical pump.
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Re: gas percolating issues
[Re: parksr5]
#1431274
05/06/13 04:20 PM
05/06/13 04:20 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
super stock
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super stock
Joined: Jul 2011
Posts: 817
Eugene, Oregon
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Are you using an iron or aluminum intake? I have an aluminum Edelbrock and it throws off a lot more heat than the old iron 2 barrel that came with the car.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: gas percolating issues
[Re: mickm]
#1431278
05/06/13 04:59 PM
05/06/13 04:59 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
ok, just typed in "carburetor gasket heat" on summit's site, and have all kinds of options from edelbrock. just have to look them over and see what the thickness of these are. good starting point though.
Mick,
Had the same problem. I bought some composite gaskets from summit. Even the 1/4" help, however, the air cleaner does rub a bit in a couple of places on the airbox.
Do you have any non ethanol fuel available in your area? Ethanol tends to flash off pretty quickly. It doesn't help that the edelbrock/carter fuel bowls are small.
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Re: gas percolating issues
[Re: mickm]
#1431279
05/06/13 05:07 PM
05/06/13 05:07 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
super stock
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super stock
Joined: Jul 2011
Posts: 817
Eugene, Oregon
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Quote:
here we go, from the edelbrock site. the last 4 digit number is the edelbrock part number.
Square-Bore Heat Insulator Gasket - 0.320" thick 9265
Divided Square-Bore Heat Insulator Gasket - 0.320" thick 9266
Square-Bore Heat Insulator Gaskets for Edelbrock Dual-Quad Manifolds - 0.125" thick - 2 gaskets included 9267
IMO I would not go with just a gasket. I have a half inch phenolic spacer and still have problems. And I'm not exactly running a 11:1 engine in Florida or anything.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: gas percolating issues
[Re: Secret Chimp]
#1431280
05/06/13 05:23 PM
05/06/13 05:23 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
IMO I would not go with just a gasket. I have a half inch phenolic spacer and still have problems. And I'm not exactly running a 11:1 engine in Florida or anything.
the issue is linkage, hood clearance, etc... i'm going to try the gaskets from edelbrock first and go from there. if it isn't enough, i'll make a decision at that point.
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Re: gas percolating issues
[Re: mickm]
#1431281
05/06/13 06:38 PM
05/06/13 06:38 PM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
master
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master
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
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Quote:
here we go, from the edelbrock site. the last 4 digit number is the edelbrock part number.
Square-Bore Heat Insulator Gasket - 0.320" thick 9265
Divided Square-Bore Heat Insulator Gasket - 0.320" thick 9266
Square-Bore Heat Insulator Gaskets for Edelbrock Dual-Quad Manifolds - 0.125" thick - 2 gaskets included 9267
Those gaskets are not made of any special material FWIW. They are just thicker.
I'm in the process of developing a gasket out of advanced materials to combat the heat transfer issues.
Stay tuned 
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Re: gas percolating issues
[Re: roadhazard]
#1431282
05/06/13 07:25 PM
05/06/13 07:25 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,179
California
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Quote:
Quote:
here we go, from the edelbrock site. the last 4 digit number is the edelbrock part number.
Square-Bore Heat Insulator Gasket - 0.320" thick 9265
Divided Square-Bore Heat Insulator Gasket - 0.320" thick 9266
Square-Bore Heat Insulator Gaskets for Edelbrock Dual-Quad Manifolds - 0.125" thick - 2 gaskets included 9267
Those gaskets are not made of any special material FWIW. They are just thicker.
I'm in the process of developing a gasket out of advanced materials to combat the heat transfer issues.
Stay tuned
interesting. if you go to the webiste, the description is of a rubber compound or something like that.
PM me when you have something! 
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Re: gas percolating issues
[Re: mickm]
#1431283
05/06/13 07:56 PM
05/06/13 07:56 PM
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard
master
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master
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
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Quote:
Quote:
Quote:
here we go, from the edelbrock site. the last 4 digit number is the edelbrock part number.
Square-Bore Heat Insulator Gasket - 0.320" thick 9265
Divided Square-Bore Heat Insulator Gasket - 0.320" thick 9266
Square-Bore Heat Insulator Gaskets for Edelbrock Dual-Quad Manifolds - 0.125" thick - 2 gaskets included 9267
Those gaskets are not made of any special material FWIW. They are just thicker.
I'm in the process of developing a gasket out of advanced materials to combat the heat transfer issues.
Stay tuned
interesting. if you go to the webiste, the description is of a rubber compound or something like that.
PM me when you have something!
This would be a totally different material than our standard performance base gaskets.
I'll let the word out after I get some made and tested. Can't say when it will be as I have lots of irons in the fire  
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Re: gas percolating issues
[Re: Secret Chimp]
#1431286
05/06/13 10:36 PM
05/06/13 10:36 PM
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Joined: Jan 2003
Posts: 75,060
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,060
U.S.S.A.
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Quote:
I'm fighting this same problem with my Quadrajet. I have a nice Moroso phenolic spacer and I can still hear the fuel percolating after shutdown. I've seen people run flat sheetmetal heat shields that block some radiant heat from the intake, but I'm wondering if spraypainting the intake with header paint might make more of a difference. I'd rather not go the electric fuel pump route since that feels like a band-aid after the actual issue.
You may think the electric fuel pump is a bandaid , and to a degree it is, but there isn't a wondergasket that will make this go away. The problem is the ethanol in the fuel, what the electric pump does is fill the fuel bowls so the car has fuel to start on, the only way to isolate the carbs is to get them away from the heat source, a 1/4" gasket isn't going to do that. You still have your carb sitting on the heat source and sitting under an air cleaner assembly that is slowing the escape of the heat.
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Re: gas percolating issues
[Re: Jjs72D]
#1431289
05/07/13 10:23 AM
05/07/13 10:23 AM
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Joined: Jan 2003
Posts: 75,060
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,060
U.S.S.A.
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Quote:
As I understand it, the Road Runner is likely a factory appearing car and you prefer to keep it that way?
I was thinking that some sort of return line may help. Something designed to keep fresh fuel in a loop instead of heated fuel just sitting in the fuel bowls. I'm not sure of how you'd do it though.
Jeff
That will help when driving, I know of one member that has/had a fuel perk issue while running once everything got hot , but that's not going to do anything for most people problems ... gas boiling off after shutdown.
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