Sound proofing material in engine bay

harryset · Posted: Thu Apr 22, 2010 8:48 pm Post subject:

I can't see any way possible that someone could seriously think that putting sound deadening materials/insulation on the engine bay walls would, or could cause the engine to run hotter. Unless you are relying on heat transfer into the passenger compartment part of the engines cooling system. Ok, I'll concede that if you used enough mass to block the normal airflow you'd run into problems.

Cooling air is drawn in through the bay louvers by the engine fan and blown out underneath and behind the vehicle. if your sheet metal is intact. Putting sound deadening material on the bay walls keeps heat and sound from transfering from the engine bay to the passenger compartment, it insulates the passenger compartment, not the engine bay. Having these materials on the bay walls in no way should cause the engine to run hotter.
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'72 Standard
Proud owner of a "Hoover Bit"

185 60's up front, Empi disc kit, 2 1/2" drop spindles, 185 65's in back, stock drums.

Sound Deadening by Secondskin

LTL4 · Posted: Thu Apr 22, 2010 9:23 am Post subject:

that is true... I lived in SAC town, for 4 years and that is pretty dry in the summers. But went to the bay area all the time, thats perfect ACVW weather....
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Newbie
Ty, 67 Sedan

Hippopotabus · Posted: Wed Apr 21, 2010 6:38 pm Post subject:

Right on man! I'd listen to anyone who kept his or her bus alive in that heat. I'm always amazed at the folks who drive ACVW in AZ.

Its a dry heat... Shocked

.....

Taking cooling advice from someone in San Francisco is like taking child counseling advice from Jeffery Dahlmer.

Laughing

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Celer, Silens, Letalis
www.2dreconbn.net

LTL4 · Posted: Wed Apr 21, 2010 4:48 pm Post subject:

That is true, Again that is what I was told, and over heating can come from a great number of different things.
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Newbie
Ty, 67 Sedan

Hippopotabus · Posted: Wed Apr 21, 2010 4:15 pm Post subject:

Dude not laughing at you but the folks who said that. I drive in really hot conditions in the summer and as long as the fan is spinning, your engine is tuned properly, and you have no air restrictions your fine.

That is to funny.
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Celer, Silens, Letalis
www.2dreconbn.net

LTL4 · Posted: Wed Apr 21, 2010 3:39 pm Post subject:

most of the sound proofing materials are a form of installation, which is what is used to keep heat in... I have not tried doing this to my car, because some VW people in AZ have said that the extra installation can cause heat to be trapped in that area and then your fan will suck in that hot air and can cause over heating.
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Newbie
Ty, 67 Sedan

Hippopotabus · Posted: Wed Apr 21, 2010 2:17 pm Post subject:

Wondering if you could explain a little. Why would sound proofing effect the cooling capabilities of an aircooled engine. Nothing restricts airflow it just deaden's the sound.
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Celer, Silens, Letalis
www.2dreconbn.net

LTL4 · Posted: Wed Apr 21, 2010 1:12 pm Post subject:

You cant really do that in AZ, to hot and with that and the heat in the summer good bye VW....
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Newbie
Ty, 67 Sedan

Hippopotabus · Posted: Wed Apr 21, 2010 10:08 am Post subject:

Image may have been reduced in size. Click image to view fullscreen.

I've done my engine bay with the aluminum (looking) bubble wrap. I like it and at night when I turn on the light (engine bay light) it helps illuminate the whole engine bay.
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Celer, Silens, Letalis
www.2dreconbn.net

Joel · Posted: Mon Apr 19, 2010 5:22 am Post subject:

RomanBug · Posted: Sun Apr 18, 2010 10:40 pm Post subject:

Be careful what you use and how well its attached. A guy i know used the firewall kit from WCM. The piece in front of the engine melted down and covered the fan in the shroud. It did its best to burn up a week old motor.

zeroman · Posted: Sun Apr 18, 2010 2:36 pm Post subject:

yA... it really depends on the amount of noise you can take and what condition your interior is.

I have (currently) NO sound proofing. But with the top down.. its still not audible.
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77 super convertible

buguy · Posted: Sun Apr 18, 2010 12:41 pm Post subject:

I disagree. I would do both. Try this in the engine compartment.
http://www.oeveedub.com/vw/bug-tinware/111-898-605.html

zeroman · Posted: Sun Apr 18, 2010 1:32 am Post subject:

nothing....
leave it.. put stuff on the inside.. if you want
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77 super convertible

harryset

I've got my engine bay de-rusted and POR'd, trying to decide what to put back in, really trying to avoid the old tarboards.
_________________
'72 Standard
Proud owner of a "Hoover Bit"

185 60's up front, Empi disc kit, 2 1/2" drop spindles, 185 65's in back, stock drums.

Sound Deadening by Secondskin


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