Under Hood Insulation
Thread Starter
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
Likes: 171
From: SoCal
Under Hood Insulation
Has anyone used anything to insulate the hood for hear and sound? The $60 after market hood pad is garbage!
Two ideas I’m considering is, 1- an OEM hood pad from a 2003 Excursion 3C3Z-16738-BD or 2- Using a butyl rubber product like Dynamat Extreme and their Dynamat hood liner.
Im looking for the best solution…
Two ideas I’m considering is, 1- an OEM hood pad from a 2003 Excursion 3C3Z-16738-BD or 2- Using a butyl rubber product like Dynamat Extreme and their Dynamat hood liner.
Im looking for the best solution…
Lead Driver
Joined: Aug 2022
Posts: 5,053
Likes: 1,409
From: Oologah, OK
the hood pad came apart on my '02 Excursion when I bought it.
been hanging loose for eons just looking at it.
the fibreglass strands got packed into the alternator and killed it from overheating.
I bought a new pad, but never put it on, forget what brand or where I got it, need to get the box and look again to see what I have....
I have bad ears, and can't hear the engine anyway, so why bother?
been hanging loose for eons just looking at it.
the fibreglass strands got packed into the alternator and killed it from overheating.
I bought a new pad, but never put it on, forget what brand or where I got it, need to get the box and look again to see what I have....
I have bad ears, and can't hear the engine anyway, so why bother?
Cargo Master
Joined: Apr 2012
Posts: 2,008
Likes: 522
From: Bottom Of Pikes Peak
you should look at second skin products. they have items that would work and they are currently 20% off.
you're most likely only going to be able to block heat. there are too many variables to reduce noise.
a company called Resonix has a product called fibermat that can be used to help with noise, otherwise mass loaded vinyl is the best for noise blocking. it's what the factory puts on the firewall. but it has to be fastened in a certain manner.
you're most likely only going to be able to block heat. there are too many variables to reduce noise.
a company called Resonix has a product called fibermat that can be used to help with noise, otherwise mass loaded vinyl is the best for noise blocking. it's what the factory puts on the firewall. but it has to be fastened in a certain manner.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
I would say the foil-backed bitumastic products like ‘dynamat’ and similar products (second skin) would definitely help reduce ‘some’ noise and combined with a factory pad - should make a noticeable difference.
Ive used second skin all over the interior of a couple trucks and my Excursion. Floors, interior firewall, inside doors and under the roof. That combined with door seal mods made those trucks noticeably quieter. I will try under the hood too next time!
Ive used second skin all over the interior of a couple trucks and my Excursion. Floors, interior firewall, inside doors and under the roof. That combined with door seal mods made those trucks noticeably quieter. I will try under the hood too next time!
Thread Starter
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
Likes: 171
From: SoCal
I would say the foil-backed bitumastic products like ‘dynamat’ and similar products (second skin) would definitely help reduce ‘some’ noise and combined with a factory pad - should make a noticeable difference.
Ive used second skin all over the interior of a couple trucks and my Excursion. Floors, interior firewall, inside doors and under the roof. That combined with door seal mods made those trucks noticeably quieter. I will try under the hood too next time!
Ive used second skin all over the interior of a couple trucks and my Excursion. Floors, interior firewall, inside doors and under the roof. That combined with door seal mods made those trucks noticeably quieter. I will try under the hood too next time!
Every bit made an incremental improvement. The moral to this, if you’re going to invest in soundproofing, go all the way. You will be glad you did! To give you an idea, all of these changes brought the sound pressure down from ~80 to now 70dB at 70mph.
The only thing left is to LineX the roof and under the hood treatment.
The Dynamat Extreme is supposed to be good to 300 degrees. Hence the reason I’m asking how warm it can get under the hood. I have a feeling the best solution would be an OEM hood pad.
Open to ideas….
Cargo Master
Joined: Apr 2012
Posts: 2,008
Likes: 522
From: Bottom Of Pikes Peak
I’ve done my entire interior with 2 layers of Kilmat (80 mil) including the roof, flooring, quarter panels, all pilers, even the rear tail gate and barn doors. Of course all four doors inside and outer skins. Since I was replacing the carpet, even under the seats got treated. I went Michelin fwy tires and bilstein shocks.
Every bit made an incremental improvement. The moral to this, if you’re going to invest in soundproofing, go all the way. You will be glad you did! To give you an idea, all of these changes brought the sound pressure down from ~80 to now 70dB at 70mph.
The only thing left is to LineX the roof and under the hood treatment.
The Dynamat Extreme is supposed to be good to 300 degrees. Hence the reason I’m asking how warm it can get under the hood. I have a feeling the best solution would be an OEM hood pad.
Open to ideas….
Every bit made an incremental improvement. The moral to this, if you’re going to invest in soundproofing, go all the way. You will be glad you did! To give you an idea, all of these changes brought the sound pressure down from ~80 to now 70dB at 70mph.
The only thing left is to LineX the roof and under the hood treatment.
The Dynamat Extreme is supposed to be good to 300 degrees. Hence the reason I’m asking how warm it can get under the hood. I have a feeling the best solution would be an OEM hood pad.
Open to ideas….
dong the work on the interior has the highest yield.
however, the typical butyl CLD (constrained layer dampening) products are not designed for blocking sound; they are for deadening of resonance in panels. Mass loaded vinyl is the king for blocking road noise. melamine foam or that fibermat i mentioned is for sound absorption and blocking noise; typically in doors or roof.
jute is another good product for certain applications.
there are only a few butyl based products that can withstand high heat. Dynamat, Second skin, resonix are the top performers iirc. I would not use it on the hood unless you are trying to get rid of some kind of resonance. you need something that is more like an insulator. Second skin has the perfect products for what you are asking.
If you used MLV everywhere you could inside the cab, you would have had better results. there have been many requests on the car audio forums about blocking road noise. CLD is not for blocking noise
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
Likes: 171
From: SoCal
I’m leaning towards just going with an OEM hood pad as the heat under the hood adds a wrench into the equation.
Does anyone know if the hood pad from a 2003 will fit on the 2001? They have different part numbers but aren’t the hoods the same?
Does anyone know if the hood pad from a 2003 will fit on the 2001? They have different part numbers but aren’t the hoods the same?
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Cargo Master
Joined: Apr 2012
Posts: 2,008
Likes: 522
From: Bottom Of Pikes Peak
I thought they all used the same hood; I know they interchange. I guess there could be minor differences but would think they would fit. I don't have any solid info to support it though
Cargo Master
Joined: Apr 2022
Posts: 3,191
Likes: 1,696
I know the newer 7.3 truck had a lot more insulation in different places the older ones to try and quiet cab noise down on them. I bet it's just a different thickness or material.
Thread Starter
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
Likes: 171
From: SoCal
I bought the 2003 hood insulation pad, picking it up next week. It’s actually listed being for a gasoline engine, mine’s a diesel.
3C3Z-16738-BD
Thinking ahead, I’ll remove the crappy aftermarket pad, then have the engine and the hood underside steam cleaned. Then I’m thinking of adding a layer of Second Skin. It’s rated for up to 450 degrees F and guaranteed adhesion for life. With the Ford hood pad over the Second Skin, would the Second Skin see those temperatures?
3C3Z-16738-BD
Thinking ahead, I’ll remove the crappy aftermarket pad, then have the engine and the hood underside steam cleaned. Then I’m thinking of adding a layer of Second Skin. It’s rated for up to 450 degrees F and guaranteed adhesion for life. With the Ford hood pad over the Second Skin, would the Second Skin see those temperatures?
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