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Insulation on manifold?
- Thread starter Doug Larsson
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ynst
Well-Known Member
Correct. and it's NOT supposed to come on performance engines, either, yet my GTX has the foam-filled foil bags and they've been there since the car was new. I replaced them because they were all worn out.
ynst
Well-Known Member
Actually, you're DEAD WRONG. The stuff is referred to as SILENCER PACKAGE, Tappet Chamber and the part number is 1879 747.It's for protection of the intake from heat transfer, causing vapor block. Valve noise suppression ? Wow that's a new one on me....
Check line 9-41-1 in your parts manual.
Please know what you're talking about before you try and belittle someone who worked as a mechanic for Chrysler/Plymouth and later Dodge when these cars were still in the showroom.
ynst
Well-Known Member
Hey hot head, who was belittling you ? I worked on Chrysler products through the seventies... And that was always the explanation I was given. Insulation for heat transfer. You have a problem with other peoples posts, then I suggest you go somewhere where you can bully at will.
ynst
Well-Known Member
If you thought it was insulation, you must have been one hell of a mechanic. It's sole purpose was to deaden the tinny echoing lifter noise emanating from the thin valley cover on non-performance engines like those found in family sedans.
The majority of car buyers DIDN'T want to hear the engine, especially when they were driving the C bodied cars. Silenced air cleaners were another part of the package design.
We knew what is was for way back then and pulled it OUT to solve warm weather vapor lock problems, especially in the Chryslers and Imperials which ran hotter than most due to the constant use of air conditioning and were not equipped with the vapor separators found on the high performance versions of the B & RB engines.
The ONLY insulating benefit it had was preventing carburetor icing in the winter as it blocked the flow of air under the manifold that could defeat the exhaust crossover system in sub-zero weather especially after the heat riser opened.
The two bags were placed at each end of the manifold, the front one being, held in place by a thin metal plate. The whole underside of the manifold was bathed in trapped hot air.
The tappet silencers were not, generally, used on Magnum engines and it is rare to find one that did have the package when built.
The majority of car buyers DIDN'T want to hear the engine, especially when they were driving the C bodied cars. Silenced air cleaners were another part of the package design.
We knew what is was for way back then and pulled it OUT to solve warm weather vapor lock problems, especially in the Chryslers and Imperials which ran hotter than most due to the constant use of air conditioning and were not equipped with the vapor separators found on the high performance versions of the B & RB engines.
The ONLY insulating benefit it had was preventing carburetor icing in the winter as it blocked the flow of air under the manifold that could defeat the exhaust crossover system in sub-zero weather especially after the heat riser opened.
The two bags were placed at each end of the manifold, the front one being, held in place by a thin metal plate. The whole underside of the manifold was bathed in trapped hot air.
The tappet silencers were not, generally, used on Magnum engines and it is rare to find one that did have the package when built.
Thanks for the clarification. "If you thought it was insulation, you must have been one hell of a mechanic." Your supposing or you know for a fact ?
Last edited:
cudak888
Well-Known Member
Please, keep it civil - there are some people (like myself) enjoying what can be learned here. He's made his point and so have you - wouldn't want to see this thread go to waste in a flame war.
-Kurt
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