Re: Intake Manifold Silencer Pad
[Re: JohnRR]
#235938
02/26/09 12:38 PM
02/26/09 12:38 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Quote:
Also that silencer pad is ALUM FOIL on the OUTSIDE , its going to TRANSFER the heat ....
The pad blocks heat that would radiate from the valley pan to the bottom of the intake. The amount of alum foil that would conduct heat is small compared to teh fiberglass insulation within, so I'd put my money that the fiberglass wins over the aluminum. Regardless, as mentioned, the amount of heat conducted from the heads into the intake is significantly higher!
I read in a Mopar mag about using a return-style fuel filter from the 80s and running a return line to the tank. Then you install a drilled bolt (or similar) inline with the return to make an orifice. Takes some 'tuning', but the premise is that you allow a pressure drain for the fuel that boils in the carb (and possibly the fuel pump), allowing it to escape back to the tank ILO evaporating.
Make the orifice small enough that the flow loss when driving is between what the FP can supply and what the engine needs.
Parts I seek:
driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set
16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better.
69-73 C-body caliper brackets and/or splashields
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Re: Intake Manifold Silencer Pad
[Re: Fury Fan]
#235939
02/26/09 12:47 PM
02/26/09 12:47 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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As for blocking the heat crossover:
I did that on one of my cars and got a TERRIBLE exhaust resonance around 2500-3000 RPM. I have an X-pipe, so maybe that was part of it, but the noise was so obnoxious that I immediately openend the crossover again.
It came on and off like a light switch, and based on my street address it always seemed to hit when driving past an old lady's house (even under normal driving). Not acceptable to me -- because it might not be acceptable to her!
Parts I seek:
driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set
16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better.
69-73 C-body caliper brackets and/or splashields
Send a PM.
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Re: Intake Manifold Silencer Pad
[Re: Fury Fan]
#235941
02/27/09 09:57 AM
02/27/09 09:57 AM
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Joined: Jan 2003
Posts: 74,978
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,978
U.S.S.A.
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Quote:
Quote:
Also that silencer pad is ALUM FOIL on the OUTSIDE , its going to TRANSFER the heat ....
The pad blocks heat that would radiate from the valley pan to the bottom of the intake. The amount of alum foil that would conduct heat is small compared to teh fiberglass insulation within, so I'd put my money that the fiberglass wins over the aluminum. Regardless, as mentioned, the amount of heat conducted from the heads into the intake is significantly higher!
I read in a Mopar mag about using a return-style fuel filter from the 80s and running a return line to the tank. Then you install a drilled bolt (or similar) inline with the return to make an orifice. Takes some 'tuning', but the premise is that you allow a pressure drain for the fuel that boils in the carb (and possibly the fuel pump), allowing it to escape back to the tank ILO evaporating.
Make the orifice small enough that the flow loss when driving is between what the FP can supply and what the engine needs.
the heat in the valley pan , maybe 230-250 degrees TOPS , is going to be LESS that the exh temp, over 600 and much higher at WOT , passing thru the exh crossover passage .
as far as the return line ... it's a VAPOR return line , little if any fuel is passing back to the tank .
The problem the OP is experiencing is the same the rest of us experience ... IT'S THE PROPERETY of the CURRENT FUEL FORMULATION.
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