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View Poll Results: Which Spacer?
4-hole 1" Spacer, Black Phenolic Plastic ....#8711 20 83.33%
Divided 1/2" Spacer, Wood Fiber Laminate ....#8725 0 0%
Performer Divided-Wall 1" Spacer, for Two-Plane Manifolds ....#8714 1 4.17%
Open 1" Spacer, Black Phenolic Plastic ....#8710 3 12.50%
Voters: 24. You may not vote on this poll

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Old 03-02-2005, 17:05   #1 (permalink)
82XE 351c
 
Join Date: Jul 2004
Location: North Coast, NSW
Posts: 627
Exclamation 4-Barrel Carburetor Spacers -Black Phenolic Plastic

Hey all,
I have a 351c in an XE. I am trying to get the carb away from the manifold and heat etc.
My car red lines at 6,000ish so I am best suited to a dual plane manifold but have a torker single at the moment. I will be moving onto dual plane very soon.

out of these spacers what would you guys run?
-I have a hornet scoop so I would be able to fit up to 2" extra.
-I am running a hume 650DP holley. Not sure of listing#.


-Open 1" Spacer, Black Phenolic Plastic ....#8710*
-4-hole 1" Spacer, Black Phenolic Plastic ....#8711*
-Open 2" Spacer, Black Phenolic Plastic ....#8712*
-4-hole 2" Spacer, Black Phenolic Plastic ....#8713*
-Performer Divided-Wall 1" Spacer, for Two-Plane Manifolds ....#8714*
-Open 3/4" Spacer, Wood Fiber Laminate ....#8719*
-Open 1" Spacer, Wood Fiber Laminate ....#8720*
-Open 1/2" Spacer, Wood Fiber Laminate ....#8724*
-Divided 1/2" Spacer, Wood Fiber Laminate ....#8725*

taken from
http://www.edelbrock.com/automotive/install1.html

I am thinking...
OPEN- good for high HP, along the lines of single plane.
4 Hole- good port speed, good for me maybe?
DEVIDED- good for dual plane but still higher rpm maybe

also this quote shows woods to keep the heat out better....
"Use open spacers where more plenum volume or more carb-to-plenum floor distance is required. 4-hole spacers enhance low-rpm torque and throttle response and dampen reversion effects on the carb. The superior heat insulating properties of wood fiber laminate are ideal for reducing heat transfer to the carb."

I would love it if the spacer didnt effect HP or Torque at all, I am only doing it for the heat transferr problems.
do the wood spacers look shit?

I will poll a couple I am guessing are correct.

Thankyou all!!
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Old 03-02-2005, 19:06   #2 (permalink)
'60 F100 Q-Code
 
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Location: Washington, USA
Posts: 750
Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

Quote:
Originally Posted by pracy
Hey all,
I have a 351c in an XE. I am trying to get the carb away from the manifold and heat etc.
My car red lines at 6,000ish so I am best suited to a dual plane manifold but have a torker single at the moment. I will be moving onto dual plane very soon.

out of these spacers what would you guys run?
-I have a hornet scoop so I would be able to fit up to 2" extra.
-I am running a hume 650DP holley. Not sure of listing#.


-Open 1" Spacer, Black Phenolic Plastic ....#8710*
-4-hole 1" Spacer, Black Phenolic Plastic ....#8711*
-Open 2" Spacer, Black Phenolic Plastic ....#8712*
-4-hole 2" Spacer, Black Phenolic Plastic ....#8713*
-Performer Divided-Wall 1" Spacer, for Two-Plane Manifolds ....#8714*
-Open 3/4" Spacer, Wood Fiber Laminate ....#8719*
-Open 1" Spacer, Wood Fiber Laminate ....#8720*
-Open 1/2" Spacer, Wood Fiber Laminate ....#8724*
-Divided 1/2" Spacer, Wood Fiber Laminate ....#8725*

taken from
http://www.edelbrock.com/automotive/install1.html

I am thinking...
OPEN- good for high HP, along the lines of single plane.
4 Hole- good port speed, good for me maybe?
DEVIDED- good for dual plane but still higher rpm maybe

also this quote shows woods to keep the heat out better....
"Use open spacers where more plenum volume or more carb-to-plenum floor distance is required. 4-hole spacers enhance low-rpm torque and throttle response and dampen reversion effects on the carb. The superior heat insulating properties of wood fiber laminate are ideal for reducing heat transfer to the carb."

I would love it if the spacer didnt effect HP or Torque at all, I am only doing it for the heat transferr problems.
do the wood spacers look shit?

I will poll a couple I am guessing are correct.

Thankyou all!!
The right spacer can really boost performance. If you're looking to just insulate your carburetor, there are 1/4" laminates and paper insulating gasket/spacers. You can also build your own very easily by simply laminating several gaskets together using a good, high-temperature adhesive.

:davis:
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Old 03-02-2005, 19:53   #3 (permalink)
347
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

My 347 stops making power at 6000rpm.

I also have a 650dp but I am running an rpm air gap .

I tried an open 1" alloy spacer ( better top end, less low end response, sort of spongy feel)

A plastic 1" 4 hole (what I am curently running, nice low down crisp responsive feel , pulls all the way to 6000 )

Tried them together very soft spongy until 3000rpm and then nice and hard till 6000
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Old 03-03-2005, 01:11   #4 (permalink)
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

Plastic ones are really cheap. Anything but metal would be good for insulation. Don't be fooled into buying one of those flash looking anodized aluminium jobs for several hundred $. They do nothing for insulating the carb from heat either.

I'm running a 2" four hole on the XD and the Hornet scoop comes in handy!

Even though you only rev to 6000, I'd still keep the single plane. Are you running a 2V or 4V Torker?

Look on ebay motors. I bough mine for $22. Here's some examples.

Plastic 4 hole 1"

http://cgi.ebay.com/ebaymotors/ws/eB...958869924&rd=1



Plastic 4 hole 2"

http://cgi.ebay.com/ebaymotors/ws/eB...958869966&rd=1

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Old 03-03-2005, 02:35   #5 (permalink)
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

I ran the open one. I personally believe the 4 hole ones woudl be too restrictive but thats my personal opinion.

I'm yet to try the spacer on the new setup.

Brenden
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Old 03-03-2005, 03:23   #6 (permalink)
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

Quote:
Originally Posted by brenx
I ran the open one. I personally believe the 4 hole ones woudl be too restrictive but thats my personal opinion.

I'm yet to try the spacer on the new setup.

Brenden
You may be surprised.

Dyno results I've seen for similar engine combo to yours, the 2" four hole came out on top.
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Old 03-03-2005, 03:26   #7 (permalink)
82XE 351c
 
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

I ended up buying a BG 1" 4 hole. got it for $60 from vpw.

the torker is 2v but ported, mismatched to by std 2v heads....
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Old 03-03-2005, 06:23   #8 (permalink)
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

TruBlu have you got the www address for the dyno results?

I'm running a 1inch open spacer at the moment, was thinking of upgrading to a 4 hole spacer on a hunch it would give some improvement. Don't know whether to go 1 inch or two inch. What's your thoughts?

Are there any other guys out there that can report what their experiences have been with various spacers?
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Old 03-03-2005, 06:51   #9 (permalink)
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

Quote:
Originally Posted by brenx
I ran the open one. I personally believe the 4 hole ones woudl be too restrictive but thats my personal opinion.

I'm yet to try the spacer on the new setup.

Brenden
Restrictive? A 4-hole spacer is akin to an extension of the carburetor base plate. There is no restriction. That's like saying a 4" piece of pipe is less restrictive than a 5" piece of pipe of the same diameter.

The primary difference between open and 4-hole is that the open spacers increase plenum volume substantially, whereas the 4-holes do not (relatively). The 4-hole spacers tend to better handle reversionary effects, but this is somewhat dependent on the design of the 4-hole spacer.

There are situations where each type spacer is generally better suited. For example, an engine with a dual plane inlet may improve slightly at the top end with a 1" open spacer. An engine with a open plenum inlet may improve quite dramatically down low with a 4-hole spacer, without sacrificing high end power.

The thickness of the spacer is a tunable element. The type of spacer that is right for a particular application depends on the particular engine and related combination.



I use a 1" 4-hole spacer on my 393" stroker Cleveland. It isn't about restriction, it is about controlling reversion and improving the signal at the venturis.

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Old 03-03-2005, 12:22   #10 (permalink)
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Re: 4-Barrel Carburetor Spacers -Black Phenolic Plastic

Quote:
Originally Posted by STROKEXD
TruBlu have you got the www address for the dyno results?

I'm running a 1inch open spacer at the moment, was thinking of upgrading to a 4 hole spacer on a hunch it would give some improvement. Don't know whether to go 1 inch or two inch. What's your thoughts?

Are there any other guys out there that can report what their experiences have been with various spacers?
I spent an hour trying to find the article in my magazines last night. I believe it was in a US mag called Car Craft. I'm away for the weekend, but I'll try and get a web link when I get back.
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