Weird Fuzz under hood...

kaos200 · 02-18-2001, 09:39 PM

Hello,
I can pretty much figure out it is for heat protection... but my BOV(I think that's what did it?) messed up all the fuzz!
anybody take that off(as I did!) I need to know any side effects (paint wise ?) or anything else to replace it with?
Thanks...

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El Kabong · 02-18-2001, 09:42 PM

It's not for heat protection, it's to put out an engine fire. At least that's what I was told. The little mounts would melt, that sheet of fuzz would drop onto the engine smothering the fire. Sounds reasonable in theory...

markus · 02-18-2001, 09:45 PM

I think it also acts as sound deadening material.

kaos200 · 02-19-2001, 12:38 AM

anymore replies..?

nikkicalves · 02-19-2001, 11:14 AM

I is in case of fire.

Nick.

markus · 02-19-2001, 11:25 AM

Not sue how effective it would be smothering fires since the air supply can just come from under the car?

SilverSuby · 02-19-2001, 11:36 AM

Who better than a fireman to answer this question.

It indeed could be to put out the fire, or at least slow it down a lot. It's probably some type of chemical that "steals" the oxygen from the fire, or maybe it's just designed to "smother" the fire. IF the fire is in your engine compartment, something must be burning. Fire cannot exist suspended in mid air[unless it's a gas], so it must be on top of some physical object.

Many things in the fire prevention industry are weird. For example, we have a device which is a special flare. You light it and put it in a fire place and it releases chemicals which will put out a chimney fire safely. If we were to use water on the chimney, we could very easily crack many of the bricks, as they WERE very hot, and are cooled off quickly.

kaos200 · 02-19-2001, 01:07 PM

hey 8,
any paint problems so far?

98mpreziveRS · 02-19-2001, 01:08 PM

interesting... but if this is indeed for fireprotection.. what would prevent the mat from just melting to the top of the hood if it were a hot enough fire *shrug*

JayP · 02-19-2001, 01:19 PM

The '97 Audi A4 1.8T's didn't have the sound deadening material. All I can suppose was either it was not included to let the heat radiate and allow the engine to run cooler, or it was a cost reducing matter... which is my theory.

The V6 engined and '98+ cars (including all the turbo Passats) have the material.

SlideWRX · 02-20-2001, 12:10 AM

Be carefull with the fuzz under the hood, it is commonly fiberglass based. be sure to wash your hands if you screw around with it alot. I know one of the main reasons for it is sound absorption, as I tested several working for an automotive supplier. Cars have to pass a Government pass-by sound test, under full throttle (don't remember which gear). If they are close to the req, but not meeting it, they will use tricks like that material to absorb sound to lower that pass-by level. they will also put it in if they feel too much noise is getting inside the car and will annoy the consumer.

If you're wondering how it works, the mechanics take a while to explain, but for example, compare a raquet ball court (very loud, lot of echo, flat hard walls) to a library (quiet, no echo, lots of soft materials like cloth and leather bound books, carpet, usually those textured ceiling tile). Cloth type materials absorb sound fairly well.

Subie Gal · 02-20-2001, 12:26 AM

i'd leave it where it is if at all possible.
it's there for a reason...

j.

8Complex · 02-20-2001, 12:35 AM

Heh, had a few dings taken out of my hood ages ago and broke all the clips. I haven't put it back in yet. Guess that is why I'm planning on a fire extinguisher. *shrug*

02-18-2001, 09:39 PM	#1
kaos200 Scooby Guru Member#: 2692 Join Date: Oct 2000 Chapter/Region: SCIC Location: SoCal	Weird Fuzz under hood... Hello, I can pretty much figure out it is for heat protection... but my BOV(I think that's what did it?) messed up all the fuzz! anybody take that off(as I did!) I need to know any side effects (paint wise ?) or anything else to replace it with? Thanks... * Registered users of the site do not see these ads.

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02-18-2001, 09:42 PM	#2
El Kabong Scooby Newbie Member#: 625 Join Date: Dec 1999 Chapter/Region: TXIC Location: Austin, TX Vehicle: 2005 STi WRB/Gold	It's not for heat protection, it's to put out an engine fire. At least that's what I was told. The little mounts would melt, that sheet of fuzz would drop onto the engine smothering the fire. Sounds reasonable in theory...

02-18-2001, 09:45 PM	#3
markus Scooby Specialist Member#: 438 Join Date: Oct 1999 Chapter/Region: W. Canada Location: St. Albert, AB, Canada Vehicle: 2004 STi White on Gold	I think it also acts as sound deadening material.

02-19-2001, 12:38 AM	#4
kaos200 Scooby Guru Member#: 2692 Join Date: Oct 2000 Chapter/Region: SCIC Location: SoCal	anymore replies..?

02-19-2001, 11:14 AM	#5
nikkicalves Scooby Newbie Member#: 3608 Join Date: Jan 2001 Location: the T-dot - The green igloo billowing black smoke Vehicle: 2000 Impreza Tanned - BRP	I is in case of fire. Nick.

02-19-2001, 11:25 AM	#6
markus Scooby Specialist Member#: 438 Join Date: Oct 1999 Chapter/Region: W. Canada Location: St. Albert, AB, Canada Vehicle: 2004 STi White on Gold	Not sue how effective it would be smothering fires since the air supply can just come from under the car?

02-19-2001, 11:36 AM	#7
SilverSuby Scooby Specialist Member#: 1599 Join Date: Jun 2000 Location: Pittsburgh, PA, USA Vehicle: 2000 Impreza RS Silver	Who better than a fireman to answer this question. It indeed could be to put out the fire, or at least slow it down a lot. It's probably some type of chemical that "steals" the oxygen from the fire, or maybe it's just designed to "smother" the fire. IF the fire is in your engine compartment, something must be burning. Fire cannot exist suspended in mid air[unless it's a gas], so it must be on top of some physical object. Many things in the fire prevention industry are weird. For example, we have a device which is a special flare. You light it and put it in a fire place and it releases chemicals which will put out a chimney fire safely. If we were to use water on the chimney, we could very easily crack many of the bricks, as they WERE very hot, and are cooled off quickly.

02-19-2001, 01:07 PM	#8
kaos200 Scooby Guru Member#: 2692 Join Date: Oct 2000 Chapter/Region: SCIC Location: SoCal	hey 8, any paint problems so far?

02-19-2001, 01:08 PM	#9
98mpreziveRS Scooby Specialist Member#: 972 Join Date: Feb 2000	interesting... but if this is indeed for fireprotection.. what would prevent the mat from just melting to the top of the hood if it were a hot enough fire shrug

02-19-2001, 01:19 PM	#10
JayP Scooby Newbie Member#: 3125 Join Date: Dec 2000 Location: Bedford, DFW Vehicle: 2001 Mustang Bullitt Black	The '97 Audi A4 1.8T's didn't have the sound deadening material. All I can suppose was either it was not included to let the heat radiate and allow the engine to run cooler, or it was a cost reducing matter... which is my theory. The V6 engined and '98+ cars (including all the turbo Passats) have the material.

02-20-2001, 12:10 AM	#11
SlideWRX Scooby Specialist Member#: 3803 Join Date: Jan 2001 Chapter/Region: MWSOC Location: South Carolina Vehicle: 07 Mustang GT 285 is a wide tire!	Be carefull with the fuzz under the hood, it is commonly fiberglass based. be sure to wash your hands if you screw around with it alot. I know one of the main reasons for it is sound absorption, as I tested several working for an automotive supplier. Cars have to pass a Government pass-by sound test, under full throttle (don't remember which gear). If they are close to the req, but not meeting it, they will use tricks like that material to absorb sound to lower that pass-by level. they will also put it in if they feel too much noise is getting inside the car and will annoy the consumer. If you're wondering how it works, the mechanics take a while to explain, but for example, compare a raquet ball court (very loud, lot of echo, flat hard walls) to a library (quiet, no echo, lots of soft materials like cloth and leather bound books, carpet, usually those textured ceiling tile). Cloth type materials absorb sound fairly well.

02-20-2001, 12:26 AM	#12
Subie Gal GC84Ever Super Moderator Member#: 301 Join Date: Sep 1999 Chapter/Region: NWIC Location: WA Vehicle: 2001 2.5 RS/70 Van 02 WRX Rally Stud	i'd leave it where it is if at all possible. it's there for a reason... j.

02-20-2001, 12:35 AM	#13
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	Heh, had a few dings taken out of my hood ages ago and broke all the clips. I haven't put it back in yet. Guess that is why I'm planning on a fire extinguisher. shrug