Firewall sound pad options-i see several ideas, What do you have/what would you do? |
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Firewall sound pad options-i see several ideas, What do you have/what would you do? |
DRPHIL914 |
Jul 23 2018, 10:57 AM
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#1
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Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
I have seen some options out there,
1. Stock 2. After market a. AA pad b. Rix914parts- modern material, light weight c. dynamat d. 914rubber pad. 3. -others?? Also in the cab, the rubber sound deadener( I assume this was only for sound or vibration, since it is rubber I doubt it did much for heat) - I pull this out it was stock and am trying to decide if I should put it back in again or do dynamat or something like this on the inside firewall before putting the backpad back in |
914Sixer |
Jul 23 2018, 11:35 AM
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#2
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914 Guru Group: Members Posts: 8,887 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Inside the cab rubber mat was just for noise that would have come through the large piece of metal. The later cars 73-up got the firewall protection that turn out to be a rust disaster. I am going with the light weight foil application in the engine bay and dynamat in the cab.
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dr914@autoatlanta.com |
Jul 23 2018, 11:42 AM
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#3
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914 Guru Group: Members Posts: 7,872 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
ours is dye cut is waterproof and made from dyna mat, which is so close to the original 74.5-76 look, that the concours judges would not know the difference. We also have the earlier style sold by Six
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DRPHIL914 |
Jul 23 2018, 11:59 AM
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#4
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Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
Inside the cab rubber mat was just for noise that would have come through the large piece of metal. The later cars 73-up got the firewall protection that turn out to be a rust disaster. I am going with the light weight foil application in the engine bay and dynamat in the cab. so no rubber pad then in your scenario. I did not have rust in my firewall, or engine shelf or hell hole dispite it being an Ohio car initially that moved to California before coming to SC around 2000. My rust was under drivers seat due to leaking window and jack points and rear longs. The original engine compartment sound pad was still in place up to a couple years ago and was really in good condition. Its gone now so I feel like I should put something in its place. If the dynamat one that George has has the reflective backing I will probably go that direction . |
Mueller |
Jul 23 2018, 12:10 PM
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#5
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
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Mikey914 |
Jul 23 2018, 05:46 PM
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#6
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The rubber man Group: Members Posts: 12,671 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Stock will hold water and is pretty heavy, however it is stock. We are making a new one with a water repellent material that is light weight and has a rubber skin that looks like the OEM and has sound deadening properties. I'll get some pics up tomorrow.
Mark |
Olympic 914 |
Jul 23 2018, 06:43 PM
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#7
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Group: Members Posts: 1,672 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
Used the X mat from Eastwood. Kind of like dynamat.
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forrestkhaag |
Jul 23 2018, 07:33 PM
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#8
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Senior Member Group: Members Posts: 935 Joined: 21-April 14 From: Scottsdale, Arizona Member No.: 17,273 Region Association: Southwest Region |
I like what I see but I am taking a different approach.
I am using a cut out firewall metal piece as a mold for a carbon fiber duplicate of the firewall. Then I will be applying dynamat or similar to the (removable) carbon back pad shell. The reason for this approach is multi-fold: The backpad, when easily removed, allows us 6-people to access the fan, belt, pulley, crank sensor, etc thru the firewall hatch (a carbon fiber part offered as a kit by ....me...) and the second firewall, although light and movable, also provides sound deadening when in place. Further, and most important, it looks very cool. Once perfected in the shop, I owe the donor of the metal firewall template the second one-off from the mold / then maybe others if interested. Pictures to follow. (IMG:style_emoticons/default/beerchug.gif) |
bbrock |
Jul 23 2018, 07:58 PM
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#9
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I'm leaning toward reusing my stock mat but spraying the back and edges with Flex-Seal to keep it from absorbing water. My hunch is that deteriorating seals are part of the rust equation with these mats, and just knowing it might be an issue makes it easy to keep an eye on and make adjustments before damage is done.
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Chris914n6 |
Jul 23 2018, 10:13 PM
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#10
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Jackstands are my life. Group: Members Posts: 3,323 Joined: 14-March 03 From: Las Vegas, NV Member No.: 431 Region Association: Southwest Region |
For the engine bay you will want something made to absorb sound first, block heat second. Add a sound absorber to the bottom of the engine lid.
For the inside, start with the aluminum backed butyl rubber sound mat that will reduce sound transfer thru the sheet metal and block heat. You can put the stock rubber piece back in but it won't be as effective anymore. Add a sound absorber like the foam back pad or carpet. Also adding jute under the carpet will reduce sound reflections. Lastly, significant engine noise bounces off the street to under the seats, so do extra back there. PS. make sure the rear window is well sealed. |
mgp4591 |
Jul 23 2018, 10:35 PM
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#11
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914 Guru Group: Members Posts: 5,376 Joined: 1-August 12 From: Salt Lake City Ut Member No.: 14,748 Region Association: Intermountain Region |
I've heard people having good results with Norco but I'm not sure if it's waterproof. I'm considering it for my interior...
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Mikey914 |
Jul 23 2018, 11:09 PM
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#12
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The rubber man Group: Members Posts: 12,671 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Dynamat is perfect for the cockpit side of the firewall. I have it on my blue car. As for re using the old back pad, not a problem as long as you don't get it wet often, and if you do you can take it out and dry out. The flexseal would be a good idea on the top and sides for sure. The main problem I have with the old ones is that they are just really heavy (and tarp water too).
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saigon71 |
Jul 24 2018, 06:51 AM
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#13
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Senior Member Group: Members Posts: 1,999 Joined: 1-June 09 From: Dillsburg, PA Member No.: 10,428 Region Association: MidAtlantic Region |
I put a lot of miles on my teener, so I wanted the interior to be "relatively" quiet.
I went with Fat Mat on the interior side - slightly thicker than Dynamat and Xmat but same concept. In the engine bay, I bought a 914Rubber replacement back pad years ago. Same thickness and fit as stock but won't hold water. Its holding up well and I am very happy with it. I'd stay away from using the stock one. Even if you seal the edges, it will find a way to hold water. |
Racer |
Jul 24 2018, 07:38 AM
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#14
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Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
Personally, I have only removed padding.. never added any. Never could understand why. Motor just never seemed that loud to me.
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DRPHIL914 |
Jul 25 2018, 08:36 AM
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#15
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Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
Anyone ever use the dynamat door kits? seems like while my doors are open and stripped this would be a good idea too,
and they have a 1/2" pad that is water proof that would be perfect for the engine compartment pad or heat in rear trunk under the carpet. Either the dynapad(for under carpet no adhesive) or dynaliner- |
DRPHIL914 |
Jul 25 2018, 09:02 AM
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#16
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Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
ours is dye cut is waterproof and made from dyna mat, which is so close to the original 74.5-76 look, that the concours judges would not know the difference. We also have the earlier style sold by Six George, is it what they call Dynapad or the Dynaliner on their website?(your firewall pad you are referring to) |
Mikey914 |
Jul 25 2018, 09:47 AM
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#17
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The rubber man Group: Members Posts: 12,671 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Matt has the dynamat door liners and also did the area around the foot wells. The dyenamat will help to reflect the sound back from the speakers on the foil side. Or so I've been told.
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DRPHIL914 |
Jul 25 2018, 09:58 AM
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#18
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Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
Matt has the dynamat door liners and also did the area around the foot wells. The dyenamat will help to reflect the sound back from the speakers on the foil side. Or so I've been told. I am thinking about ordering that kit- the kit is for 4 door, so I thought about using it inside and behind the outer panel both. I don't think I am going to have time to knock this all out now, but I want to do the doors while they are open, that is why I also just got my door rebuild kit and door stay replacemnent from you !. Next will be the inside under carpet and backpad, but not really necessary to get the car running and on the road. We are in need of a trunk pad replacement and that is where I was looking at the dynapad non-stick option- it is specifically designed for trunk or floor where exhaust heat is transmitted. Maybe someone could use an original for a template and cut them, like you and George do for your firewall pad??? |
Mikey914 |
Jul 25 2018, 11:25 AM
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#19
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The rubber man Group: Members Posts: 12,671 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Easy to cut you a part, the only hesitation I would have is in the trunk especially towards the back they could trap water.
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DRPHIL914 |
Jul 25 2018, 12:55 PM
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#20
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Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
Easy to cut you a part, the only hesitation I would have is in the trunk especially towards the back they could trap water. not as much of a worry really, this car will not ever be left outside other than during a trip to okteenerfest. Garage storage only- but if in a pinch it has to be outside, I have 2 covers - besides that, I have all new 914rubber.com seals so should be air and water tight, right?? (IMG:style_emoticons/default/poke.gif) |
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