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Old 04-28-2005, 09:10 PM
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Under hood insulation? reason for being?

whats the reason for having the dust trap on the underside of the hood? i was thinking about washing the really dusty engine bay on my car but i know the first thing that will happen when i close the hood.

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Old 04-28-2005, 11:43 PM
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I think it was just to make the engine noise less obvious to driver & passengers. My '72 Nova came with it, but after it shrunk & fell out, the only difference I notice is that there's no more fiberglass under my contact lens after I bump my head on the hood. Same with my '88 T-bird.
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Old 04-29-2005, 04:44 AM
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Quote:
Originally Posted by jimfulco
I think it was just to make the engine noise less obvious to driver & passengers.
Also the manufacturers knew that someday we'd be restoring old cars and since this was the first thing most people removed from their car in 25-30 years there would be a whole new market for the crap so they could sell more of it.

Seriously it was to cut down on engine noise other than that all it does is make a mess. I rather look at the underside of the hood than that nasty thing.
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Old 04-29-2005, 05:31 AM
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Does it do anything for heat absorbtion? That's what I thought it was for! After the car is stopped, the engine is still warm, heat rises... That's my theory...
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Old 04-29-2005, 07:16 AM
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Quote:
Originally Posted by 66Caprice
Does it do anything for heat absorbtion? That's what I thought it was for! After the car is stopped, the engine is still warm, heat rises... That's my theory...
No, if anything, you'd want to get that heat out of there quickly.

But, it really made a difference in the general "feel" of the car. I can remember when Cadillac first came out with it (first for Cadillac, that is) in the fifties. For those who live in snow country, it's like when you get into your car in the morning and take off after a heavy overnight snow. Even if your car's an old clunker, it feels like a luxury car. (I've lived in California, Arizona, and Florida for so many years that the memory of those pleasant mornings almost makes me forget why I left that part of the country.)
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Old 04-29-2005, 01:28 PM
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I can't speak for GM or Ford, but I know that Mopar also uses the mat for fire suppression. Did you ever notice that those mats are usually held in with plastic pins really cheap aluminum/pot metal pieces? The idea is, in the event of an engine fire, the pieces that hold the mat on would melt, allowing the mat to fall and smother the flames.
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Old 04-29-2005, 02:51 PM
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yeah, I think that's how it's supposd to go,, But I have had the one on my '78 Monarch catch on fire when I was tuning it when it backfired through the carb.

Last edited by BuickLeSabre1960; 04-29-2005 at 02:59 PM.
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Old 04-29-2005, 06:52 PM
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All sound, no heat

The insulation doesn't do anything for heat absorbtion. Besides, the heat emitted from the engine isn't enough to melt the paint off your hood, or under it for that matter. It's just there for sound absorbtion. I'm glad that the insulation was non existent on my bronco II. This way I can hear the motor, which I like hearing.
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Old 05-02-2005, 09:39 PM
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Well, the insulation does keep the snow & ice from melting off your hood so fast. You always wanted it splattering onto the windshield for 20 miles, didn't you?
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Old 05-02-2005, 10:02 PM
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haha

i removed it and all i notice was a little louder maybe but i dunno..louder engine noises better or well long as it aint a bad noise lol
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Old 05-03-2005, 06:10 AM
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I should have been a little clearer about the heat absorbtion - I meant after driving the car and parking it. Then, the heat goes up and the hood can get pretty hot. I would think that the constant extreme change in temps through time would affect the paint a little.
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Old 05-03-2005, 06:11 AM
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keeps the majority of the heat from the engine off your hood.
heat will ruin your paint really quik.
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Old 05-03-2005, 09:38 AM
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It's been gone for a while even before I bought my truck, and the paint is fine.
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Old 05-03-2005, 07:56 PM
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Quote:
Originally Posted by jimfulco
Well, the insulation does keep the snow & ice from melting off your hood so fast. You always wanted it splattering onto the windshield for 20 miles, didn't you?
hahahaha, yea that's alot of fun.


I always thought that stuff was there acting as a barrier to keep the heat from doing damage to your paint.
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Old 05-03-2005, 08:14 PM
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I always thought it was there to choke you to death and make your eyes water from all the dust from it every time you opened to the hood. Guess it really does something useful

Brad
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