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Author Topic: Trunk sound deadner  (Read 2924 times)
NoYenko
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« on: November 11, 2012, 11:15:48 AM »

I am looking for some pictures & dimension's of the sound deadner in the trunk on 69 custom interior cars. My car had tar & undercoating all over the trunk that I stupidly scraped off thinking someone added it as a patch. I have one bad picture that doesn't show enough detail. Thanks for your time. George
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IZRSSS
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« Reply #1 on: November 11, 2012, 11:39:13 AM »

Interesting topic. Some discussion here; http://www.camaros.net/forums/showthread.php?t=185813
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NoYenko
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« Reply #2 on: November 11, 2012, 12:26:18 PM »

Thanks for the link. That is interesting concerning under coating sprayed on inside of quarter panels. What I need is information concerning Tar paper on front floor of trunk. George
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IZRSSS
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« Reply #3 on: November 11, 2012, 02:17:11 PM »

Oops  Embarrassed
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69Z28-RS
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« Reply #4 on: November 12, 2012, 01:15:37 PM »

I suspect someone added the tar paper and undercoating in trying to quieten the car; 
My 09C (late) production Z28/RS (with custom cloth interior) does not have any tar paper or undercoating on the floor of the trunk.
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Ed Bertrand
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« Reply #5 on: November 12, 2012, 01:24:34 PM »

Gents, he's referring to the trunk paper that was added by Fisher Body on deluxe interior cars.

This one's a 68, but 69 is basically the same.

Ed

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tmodel66
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« Reply #6 on: November 12, 2012, 01:26:39 PM »

Was that just a little something extra for sound deadening? Or did it have a specific duty?
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Daniel  
'69 SS 350/4 speed  Fathom Green--POP
69Z28-RS
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« Reply #7 on: November 12, 2012, 01:32:07 PM »

My 69 has no evidence of ever having had anything like that...  I've owned it since 1975-76....

Gary
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Ed Bertrand
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« Reply #8 on: November 12, 2012, 01:34:40 PM »

It was designed as a heat barrier to keep the heat from the muffler from melting/deforming the trunk mat.

John has a good picture of his from his 69Z that I'll ask him to post.

Ed
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tmodel66
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« Reply #9 on: November 12, 2012, 01:35:55 PM »

OK Thanks Ed. Makes sense now.
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Daniel  
'69 SS 350/4 speed  Fathom Green--POP
NoYenko
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« Reply #10 on: November 12, 2012, 02:21:01 PM »

Ed, can't thank you enough for the post. That is exactly what I was looking for. What a great site. I would appreciate seeing Johns photo also. Does anyone know if this was only on early cars because someone else with a later built car said his did not have the tar paper. From the stuff I scraped off I assume it is the same as the floor tar paper deadner.George
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JohnZ
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« Reply #11 on: November 12, 2012, 03:16:19 PM »

I can't locate my photo at the moment, but it's just like Ed's photo in reply #5 - all original Deluxe Interior 69's got that mastic deadener pad at the front of the trunk floor.
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'69 Z/28
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69Z28-RS
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« Reply #12 on: November 12, 2012, 04:56:46 PM »

If the purpose of this was 'heat insulation' from the muffler, what is the possibility that when they changed the exhaust configuration, and added the resonators forward of the muffler, that they also deleted this material?   There would be more heat dissipated forward of that point, and less heat at the muffler with that change....

Gary  / 69Z28-RS
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
IZRSSS
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« Reply #13 on: November 12, 2012, 05:09:10 PM »

Ed, can't thank you enough for the post. That is exactly what I was looking for. What a great site. I would appreciate seeing Johns photo also.

Amazing...why do you think I wanted these guys out-back on the T-shirt? Anyone know if Kurt has a '67  Huh Wink
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paceme
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« Reply #14 on: November 13, 2012, 09:44:03 AM »

If the purpose of this was 'heat insulation' from the muffler, what is the possibility that when they changed the exhaust configuration, and added the resonators forward of the muffler, that they also deleted this material?   There would be more heat dissipated forward of that point, and less heat at the muffler with that change....

Gary  / 69Z28-RS

Gary, all deluxe interior cars were provided the sound deadener( I've seen it on a 10C of 69 and is also on my 9c of 69 car).

Interesting point Ed makes that its purpose was to dissipate heat. My feeling is that the trunk floor deadener purpose was to attenuate any noise / resonance due to the rear axle and suspension in the open trunk area. The material they use I wouldn't classify as heat resistant.

 Ed where is this referenced "It was designed as a heat barrier to keep the heat from the muffler from melting/deforming the trunk mat".

Thanks,
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Steve Shauger
Vintage Certification™ Program, Providing Recognition And Status To Unrestored Vehicles. Website www.vintagecertification.com
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