Underhood Insulation Revitalization
Thread Starter
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Underhood Insulation Revitalization
Since the molded insulation is no longer available and since the new 1/2" thick version won't fit my application (note the indentations in the OE insulation), I threw caution to the wind and decided to attempt a clean-up. I used Simple Green on a towel and softly wiped in the direction of the insulation's weave. I did that several times, then rinsed the towel with clean water and went over it again. Big improvement, I think. Next? I purchased some adhesive-backed Neoprene rubber (1/16") that will cover the hole made by the air-cleaner nut.
Before and after pics.
JamesC
Before and after pics.
JamesC
Last edited by JamesC; Jun 4, 2016 at 01:36 PM.
Thread Starter
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
COTM Editor
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Joined: Mar 2006
Posts: 4,098
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From: WINDSOR, CO
Car: 91 Z28, 87 SC, 90 IROC, 92 RS
Engine: LS1, 305 TPI, L98, NADA
Transmission: T56, 700r4's, and NADA
Axle/Gears: 3.89, 3.42, 3.23, NADA
Re: Underhood Insulation Revitalization
I have been using plasti-dip with great success on my last couple resto's. Leaves the satin sheen of the original, and will fill in the defects from belt abrasion, or else. You can kinda mat the fibers how they need to lay, then spray.
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Joined: Dec 2001
Posts: 9,937
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
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Posts: 3,178
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From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Thread Starter
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Underhood Insulation Revitalization
COTM Editor
iTrader: (11)
Joined: Mar 2006
Posts: 4,098
Likes: 13
From: WINDSOR, CO
Car: 91 Z28, 87 SC, 90 IROC, 92 RS
Engine: LS1, 305 TPI, L98, NADA
Transmission: T56, 700r4's, and NADA
Axle/Gears: 3.89, 3.42, 3.23, NADA
Re: Underhood Insulation Revitalization
Wow, didn't know you couldn't get these from the dealerships any more! I bought a new one for my 92 GTA back in 2002 from my Pontiac dealership and it was a perfect identical match for the original. Sadly my STB has worn into it in a couple spots since then. Crap.
Thread Starter
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
COTM Editor
iTrader: (11)
Joined: Mar 2006
Posts: 4,098
Likes: 13
From: WINDSOR, CO
Car: 91 Z28, 87 SC, 90 IROC, 92 RS
Engine: LS1, 305 TPI, L98, NADA
Transmission: T56, 700r4's, and NADA
Axle/Gears: 3.89, 3.42, 3.23, NADA
Re: Underhood Insulation Revitalization
Just the black Plasti-dip in the aerosol can. Should be stocked pretty deep in the auto parts stores or home improvement stored. Most other aerosol paint companies (duplicolor & Rustoleum etc) have their own versions which I think would probably work just fine as well.
Thread Starter
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Underhood Insulation Revitalization
Here's what I ended up with, though I'm unsure if I'm totally lovin' it. I plugged the hole with insulation then used 1/16 inch thick Neoprene self-adhesive sheet to cover the hole on both sides. The naked hood doesn't look too bad, so at some point I might just jerk it altogether and wait for a proper repo.
JamesC
JamesC
Last edited by JamesC; Jun 13, 2016 at 09:54 AM. Reason: Additional info
Thread Starter
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Underhood Insulation Revitalization
JamesC
Junior Member
Joined: May 2016
Posts: 9
Likes: 0
From: Western WI
Car: 1989 Formula T-Top
Engine: LB9-N10
Transmission: MM5
Axle/Gears: 3,42 posi
Re: Underhood Insulation Revitalization
Guys,
Did all Gen3's come with that hood pad? My is missing and it almost appears like it did not have one installed to begin with.
All I have on my hood is that ac compressor stripe...
Thx,
Did all Gen3's come with that hood pad? My is missing and it almost appears like it did not have one installed to begin with.
All I have on my hood is that ac compressor stripe...
Thx,
Re: Underhood Insulation Revitalization
I think mine is past redemption, I like the look without it but I figure it's probably going to need a lot of clean up under the pad if I remove it. I was gifted the one insulation holder i'm missing so I guess I will just install it the next time I have the hood up.
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Joined: Jan 2005
Posts: 1,401
Likes: 199
From: S. UTAH
Car: 1989 IROC-Z 305 LB9 AT Convertible
Engine: LB9 305
Transmission: AT
Re: Underhood Insulation Revitalization
FWIW The Factory Shop Manual for my 1979 Trans Am, SPECIFICALLY states some oil leakage from the front seal, on the A6 compressor is NORMAL. IT says only replace for a Freon leak.
Junior Member
Joined: May 2016
Posts: 9
Likes: 0
From: Western WI
Car: 1989 Formula T-Top
Engine: LB9-N10
Transmission: MM5
Axle/Gears: 3,42 posi
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