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Old 08-12-2007, 06:45 PM
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what grade phenolic material to use....

I'm planning to make some manifold spacers outta some phenolic mat'l. I don't know what grade,spec,etc to use. I want the inexpensive one that will do the job,without buying some that's overkill.

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Old 08-12-2007, 09:21 PM
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Im not really sure on this but am interested also ......wood can be used for spacers too
Shane
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Old 08-12-2007, 09:46 PM
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how thick?
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Old 08-12-2007, 09:55 PM
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really it depends on the application in which you intend to use it.

delrin comes to mind although its brittle nature tends to not like torsional loading.

ABS plastic doesnt like too much heat.
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Old 08-13-2007, 07:19 AM
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Quote:
Originally Posted by Chevrolet4x4s
Im not really sure on this but am interested also ......wood can be used for spacers too
Shane

Wood is a real bad idea for spacers, it will absorb the fuel which will lead to other problems over time.
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Old 08-13-2007, 07:35 AM
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Quote:
Originally Posted by sc2dave
I'm planning to make some manifold spacers outta some phenolic mat'l. I don't know what grade,spec,etc to use. I want the inexpensive one that will do the job,without buying some that's overkill.
I assume you are referring to carb to intake spacers.

Phenolic comes in two different materials.

One is paper and resin combination and should NOT be considered for your application.

The other is linen and resin and can be used.

The commercial spacers I've seen are made from linen phenolic material, wood, delrin (black) or aluminum.

Why don't you use aluminum or delrin?
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Old 08-13-2007, 10:46 PM
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Quote:
Originally Posted by Tech @ BG
Wood is a real bad idea for spacers, it will absorb the fuel which will lead to other problems over time.
I had wondered about this but have seen how wood makes such good spacers and is shuch a good insulator and figured that the I must have been missing something
Shane
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Old 08-14-2007, 09:36 PM
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Quote:
Originally Posted by Frisco
I assume you are referring to carb to intake spacers.

Phenolic comes in two different materials.

One is paper and resin combination and should NOT be considered for your application.

The other is linen and resin and can be used.

The commercial spacers I've seen are made from linen phenolic material, wood, delrin (black) or aluminum.

Why don't you use aluminum or delrin?
The reason i want to use this,is to isolte the inate manifold from the engine heat,and perhaps between the throttle body.Denser air,possibly.
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Old 08-15-2007, 07:32 AM
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Quote:
Originally Posted by sc2dave
The reason i want to use this,is to isolte the inate manifold from the engine heat,and perhaps between the throttle body.Denser air,possibly.
A spacer between the throttle body (or carb) will isolate engine heat from them. Even a thin sheet-metal plate will do that.

I've not seen spacers used to isolate engine heat from the block to the intake manifold.

There are intakes that have the heat riser section blocked off as well as intake gaskets that will block this area.

An "air gap" style intake will also give a cooler, denser air over a stock intake.

A "cold air" intake would give you denser air (as compared to the under the hood air). This is an air cleaner system that is popular with late model cars. Routes the outside air thru an air cleaner and tube to the intake of the Fuel injection/throttle body/carb.
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Old 08-15-2007, 08:06 AM
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For spacers I would use Grade C or CE they're both medium weave cotton cloth Phenolics. The CE is a little bit more expensive but has better chemical resistance. Just remember when you order a specific thickness it will be thicker than the size ordered. A 1" thick phenolic will measure about a 1/32 over.

One thing to remember, this stuff is unbelievably expensive. Make sure you're sitting down when you get a price and grades C and CE are the cheaper grades. Also when you machine it wear a dust mask or something to keep the stuff out of your lungs.
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Last edited by engineczar; 08-15-2007 at 08:12 AM.
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Old 08-15-2007, 08:44 AM
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fair to good chance you local parts store has a OEM heat insulator gasket (1/4'-3/8" thick) for your carb/intake set up for $10?....
they were used on many many cars and trucks to prevent vapor lock.....

Edelbrock .320" thick insulator gasket is $14... PN# 9265...Autozone (or other chain store) can order one in for you...(save the mail order charges?)

Felpro insulator gasket for a Holly or a Q-jet $13

Last edited by red65mustang; 08-15-2007 at 09:16 AM.
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Old 08-15-2007, 06:33 PM
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thin sheet metal will still conduct heat.it is not an insulator.phenolic mat'l reduces heat by a few hundred percent.
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Old 08-15-2007, 06:51 PM
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Quote:
Originally Posted by red65mustang
fair to good chance you local parts store has a OEM heat insulator gasket (1/4'-3/8" thick) for your carb/intake set up for $10?....
they were used on many many cars and trucks to prevent vapor lock.....

Edelbrock .320" thick insulator gasket is $14... PN# 9265...Autozone (or other chain store) can order one in for you...(save the mail order charges?)

Felpro insulator gasket for a Holly or a Q-jet $13
There's the answer. Thanks red.
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Old 08-15-2007, 07:13 PM
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But i don't need a carb gasket of any kind.Heck, i don't even run any carb. Hey engineczar,is this good? Grade CE Phenolic > Shape > Thickness > Length > Width
Plastics
This product matches all of your selections.

Part Number: 8491K24
$27.77 Each
Material
Garolite
Garolite Material
Grade CE Garolite
Backing
Plain Back
Shape
Sheets, Bars, Strips, and Cubes
Sheets, Bars, Strips, and Cubes Type
Rectangular Sheet
Thickness
1/4"
Thickness Tolerance
.015"
Length
24"
Length Tolerance
1"
Width
12"
Width Tolerance
1"
Opaque
Brown
Operating Temperature Range
+32 to +239 F
Tensile Strength
9500 psi lengthwise, 7500 psi crosswise
Impact Strength
2.3 ft.-lbs./in. flatwise, 1.4 ft.-lbs./in. crosswise
Tolerance
Standard
Hardness
Rockwell M: 104
Specifications Met
Military Specifications (MIL)
MIL Specification
MIL-I-24768
UL Rating
UL 94HB
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Old 08-16-2007, 05:45 AM
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That's the grade you want and the price is surprisingly low. Many times they only sell full sheets.
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