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#2390620 - 10/20/17 10:35 PM Carburetor spacers for heat
RAY1969CARS Offline
super stock

Registered: 04/05/07
Posts: 1188
Loc: CA.
Hi guys what is the minimum thickness of Phenolic Spacer you should put under your carburetor to stop transfer of heat
thanks Mopar or no car

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#2390633 - 10/20/17 11:29 PM Re: Carburetor spacers for heat [Re: RAY1969CARS]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9056
Loc: Charleston
Probably even 1/4" will help alot
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#2390643 - 10/20/17 11:53 PM Re: Carburetor spacers for heat [Re: sixpackgut]
Pacnorthcuda Offline
I Live Here

Registered: 11/19/07
Posts: 18987
Loc: Kirkland, Washington
Originally Posted By sixpackgut
Probably even 1/4" will help alot



I agree. Additional thickness is only going to gain decreasing gains. Other concerns such as air cleaner clearance and linkage come into play..

And the discussion of power with an intake riser is another thread.

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#2390649 - 10/21/17 12:10 AM Re: Carburetor spacers for heat [Re: RAY1969CARS]
sasquatch Offline
top fuel

Registered: 03/26/05
Posts: 2262
Loc: North Carolina
Check out a company called coolcarb technologies. www.coolcarb.com
Not sure of any power gains but they should help with fuel temps inside the carb.
Todd
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#2390661 - 10/21/17 12:57 AM Re: Carburetor spacers for heat [Re: RAY1969CARS]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26679
Loc: Balt. Md
I would say at least a 1/4". You can see mine here as it looks to be an inch. Its been on the car so long I forgot what size it was. And it made a ton of difference to help stop the fuel from boiling in the carb bowls. Ron

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My car...63 Sport Fury Max Wedge wanna be street car..with new 493 pump gas full exh eng.......10.76 @ 124.49 ! ! ! My page on the cool 62-65 Mopar site ! http://www.1962to1965mopar.ornocar.com/mmo82008.html

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#2390668 - 10/21/17 01:09 AM Re: Carburetor spacers for heat [Re: RAY1969CARS]
Al_Alguire Offline


Registered: 01/20/03
Posts: 16706
Loc: Rockville MD & Las Vegas
We tested this stuff years ago. Found hardwood actually worked better than phenolic spacers did. We settled on 1/2" spacers. But this was years ago for sure. Also those heat shields have been around for years, in a pump gas street car with a tight engine compartment they wore worth something I would imagine. Will definitely help with boiling fuel in the bowls for sure.
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#2390681 - 10/21/17 02:00 AM Re: Carburetor spacers for heat [Re: Al_Alguire]
RAY1969CARS Offline
super stock

Registered: 04/05/07
Posts: 1188
Loc: CA.
Right on I'm going to try 1/4 thanks

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#2390749 - 10/21/17 09:49 AM Re: Carburetor spacers for heat [Re: RAY1969CARS]
cudaman1969 Offline
master

Registered: 01/25/04
Posts: 4242
Loc: fredericksburg,va
I don't know what the minimum thickness is but I made up a 2 "one out of 1/2 " Baltic birch 9 ply plywood for the race car. Carb was no hotter than the fender, the manifold-engine was to hot to touch. I was still able to close the hood with tall intake and that spacer and air cleaner (383). Wood is one of the best insulators also.

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#2390764 - 10/21/17 10:22 AM Re: Carburetor spacers for heat [Re: cudaman1969]
moparx Offline
Dreaming of implants

Registered: 09/03/03
Posts: 8722
Loc: north of coder
does anyone make a phenolic adapter for a spread bore to square bore application ?
beer

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#2390782 - 10/21/17 10:47 AM Re: Carburetor spacers for heat [Re: RAY1969CARS]
Bad340fish Offline
master

Registered: 01/20/03
Posts: 5634
Loc: Tulsa OK
If you really wanted to isolate the carb from the manifold you would also need to use nylon or fiber washers under the carb nuts. Probably minimal gains but thats one less spot to transfer heat.

When I had a carb my vapor lock problems were rare even with a stock hood, but it seemed to be underhood temp as opposed to engine temp that got them. I have an old trans temp gauge hanging near the master cylinder. When it reads over 180* is when vapor lock problems seem to start. In a stock engine compartment full of hot air I am not sure you can make much of a difference. I never had room for a spacer so I was never able to try.
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#2390792 - 10/21/17 11:18 AM Re: Carburetor spacers for heat [Re: RAY1969CARS]
Thumperdart Online   work


Registered: 07/12/04
Posts: 18691
Loc: State of confusion
I try and use a 1/2 minimum or more if possible according to the type of manifold, rpm range and of course space available.........I run a 1/2" 4 hole under my Dommy..............
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#2390796 - 10/21/17 11:23 AM Re: Carburetor spacers for heat [Re: sasquatch]
Thumperdart Online   work


Registered: 07/12/04
Posts: 18691
Loc: State of confusion
Originally Posted By sasquatch
Check out a company called coolcarb technologies. www.coolcarb.com
Not sure of any power gains but they should help with fuel temps inside the carb.
Todd


Not too impressed w/a 100+ degree carb and I posted a video on VB where my engine was around 160 the intake 120 ish and my carb was 71 degrees after sitting w/just a 1/2" wooden spacer............ thumbs
_________________________
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB for videos and lots of carb pics......760-900-3895.....

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#2390799 - 10/21/17 11:26 AM Re: Carburetor spacers for heat [Re: Thumperdart]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9056
Loc: Charleston
The best way to keep a carb running nice and cool is a bypass fuel regulator after the carb so cool fuel is always available. Even with this setup, the secondary fuel bowl can get really hot on those 100 mile drives between fill ups
_________________________
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram

performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs

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#2390811 - 10/21/17 11:49 AM Re: Carburetor spacers for heat [Re: sixpackgut]
Thumperdart Online   work


Registered: 07/12/04
Posts: 18691
Loc: State of confusion
Agree that a TRUE return is best and my pump just returns straight into the cell but wonder if I can mod it and will call Magna-fuel and ask em for giggles............ beer
_________________________
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB for videos and lots of carb pics......760-900-3895.....

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#2390825 - 10/21/17 12:07 PM Re: Carburetor spacers for heat [Re: sixpackgut]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26679
Loc: Balt. Md
Originally Posted By sixpackgut
The best way to keep a carb running nice and cool is a bypass fuel regulator after the carb so cool fuel is always available. Even with this setup, the secondary fuel bowl can get really hot on those 100 mile drives between fill ups



Thats true. I have got away with my deadhead setup but I have a return type regulator I would like to install. Course I have a stock tank and will have to find a sending unit with a port or take mine out and make a port for a return line. I have also heard wood is the best isolator to use and I may switch to wood soon. Ron
_________________________
My car...63 Sport Fury Max Wedge wanna be street car..with new 493 pump gas full exh eng.......10.76 @ 124.49 ! ! ! My page on the cool 62-65 Mopar site ! http://www.1962to1965mopar.ornocar.com/mmo82008.html

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#2391452 - 10/22/17 07:40 PM Re: Carburetor spacers for heat [Re: sasquatch]
BloFish Offline


Registered: 11/20/04
Posts: 13794
Loc: Lake Oroville
Originally Posted By sasquatch
Check out a company called coolcarb technologies. www.coolcarb.com
Not sure of any power gains but they should help with fuel temps inside the carb.
Todd


I’m going to give that a try.
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as long as you look good doing it!

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