Insulation around engine bay...? (Page 2/5)
Dennis LaGrua MAR 19, 07:51 PM

quote
Originally posted by Rickady88GT:


On my last 2 engine swaps I doubled up the stock heat shields. I used a heat reflecting insulation on the inside of the trunk under the carpet.
Through the years of searching wrecking yards for parts, I have seen several melted trunk carpets from the exhaust. The factory sound insulation under the carpet is discolored from heat.



Did the same here. The heat shield with insulation under the trunk carpet keeps the trunk much cooler. As for the all that fiberglass insulation around the engine compartment; if you remove it you will hear more engine and exhaust noise. This is especially so if you have a short exhaust system for a swap..

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Notorio JUL 03, 06:31 PM

quote
Originally posted by Patrick:
I believe it's primary purpose in the engine bay is for sound deadening. It's secondary purpose is to irritate the skin of anyone working around it back there.



Had to revive this old thread to say 'Good one, Patrick.' No more scratchy arms, out it comes ...
robymon JUL 04, 03:22 AM

quote
Originally posted by Egor:

I have found that it is great for rats to build nests on top of the manifold.

After a large amount of cleanup, I went with after market heat and sound deadening over the entire firewall.
Much better.

Egor




What brand/type of heat/sound deadening did you use?
Vicophine JUL 09, 08:25 AM

quote
Originally posted by robymon:


What brand/type of heat/sound deadening did you use?



I would also like to know, thinking of removing mine when I swap in my donor GT motor.
darbysan JUL 09, 10:08 AM
On my 3800SC install, I removed all of the stock insulation, and replaced it with 1/4" thick Mighty Matt insulation. Very impressive stuff, easy to cut and mold to shape. Attached it with spray contact adhesive, and Aluminum Duct Tape to seal the edges. I left the fenders blank, but did cover the outside of the trunk. For sound deadening on the firewall, I installed RAAMmat BXT II. It has excellent adhesive properties in heat, and does a good job of sound insulation. Install the MightyMatt over the Raammat to help protect it from the heat.

------------------
'87 GT , '00 3800 Series II SC, 4t65e, Vue Power Steering. (SOLD)

rogergarrison JUL 10, 07:30 AM
I threw it away on all my Fieros. Its just a dirt and water collector. I never had a problem with items in trunk, although I wouldnt carry groceries there. I like to hear my engine myself. If quiet is a necessity, just put sound deadener like DynaMat on the inside, under the rear panel carpet, in the doors, and under the carpet. If you want quiet, buy a Cadillac, not a 'sports' car .

" I bought my Ferrari for the comfortable, quiet ride."
Egor JUL 12, 02:25 PM
Sorry robymon & Vicophine, I've been out of town and haven't looked at the forum.

I found the receipt for the insulation (OReilly Auto), but the receipt was too smudged to read the part number or brand.
It came in sheets about 48" by 24" and cost $84 before taxes. This was enough to do the complete firewall. You would have double this to do the trunk.
It has a glue backing that makes it easy to install. The engine was out of my car when I installed the insulation, which made it pretty easy.
It would be tough to do with the engine in place.

Good luck

------------------
____________________________________________
"Of all the things I have lost during my lifetime, I miss
my mind the most."

dwilsonfl NOV 26, 12:18 PM
I have a similar issue with my 88GT and have been searching the forums to see what people have chosen to do. I absolutely want the original gone, but I hate to put something shiny in there when it was black originally. The black insulation I've seen looks to be for sound only. I'm more concerned with heat. Anyone looked at it from that perspective and has a recommend? Some of the threads are 5+ years old now and I'd like something that's up to date.

Thank you,

David
gone: 84 SE, 84 base auto, 85GT
here and in process: 1988 5speed GT
Dennis LaGrua DEC 03, 10:15 AM

quote
Originally posted by Patrick:

With the trunk getting that hot, I'd be wondering if the factory metal heat shield between the muffler and trunk was missing (or damaged/incorrectly mounted and jammed up directly against the trunk).



With the short exhaust system most of us 3800SC engine swap guys use the trunk gets very hot even with the heat shield. Eventually I will put some ceramic stove insulation between the shield and the trunk. It got so hot in there it distorted a small wheeled carry on a bit but it didn't harm the rug.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Wichita DEC 03, 01:03 PM
Mine is all ripped out right now, but I plan on using sound deadening material on the firewall. I don't need any heat shielding properties, so I can use any decent sound deadening material.