The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-26-2018, 01:11 AM   #1
LT7A
Registered User
 
Join Date: Oct 2015
Location: Seattle, WA
Posts: 770
Hood insulation: Why? Do you keep it or don't you?

I posted this over in SquareLand but I figured I would see if I could get input from people that hang out in other parts of the forum since the topic applies to more than squarebodies.

I've had some vehicles with hood insulation and some without. From a high performance mindset, I can't see how it would help. Unless you live way up north in Coldlandia or Coldaska and have a hard time maintaining operating temperature, I don't see how there's a benefit except at initial startup/warmup. I can more easily make a case that it's there just to suppress sound. We all know that NVH is really important to the manufacturers. I would imagine that quiet seems smooth, and smooth + quiet probably help sell vehicles on test drives. Once up to operating temperature, it seems that any insulation would have a negative effect on performance. There is a lot of air going over the top of the hood that could draw heat out of the engine compartment. The closest thing to the hood is typically where the air and fuel are being drawn in. Any drop in temperature in that area sure seems like it would be a performance gain however minimal.

I'm considering pulling the hood insulation out of all of my rigs. I don't mind hearing the motor when it's doing its job. And generally speaking, if it's not revving up, then I don't think it's going to transmit much noise through the hood through the windshield and into the cabin. And I don't mind startling innocent bystanders and woodland creatures when I drive by. What do you guys think: Keep it, add it, toss it?
LT7A is offline   Reply With Quote
Old 05-26-2018, 06:48 AM   #2
mongocanfly
Senior Member
 
Join Date: May 2015
Location: Alabama
Posts: 7,072
Re: Hood insulation: Why? Do you keep it or don't you?

my 81 came with the insulation...but it looked crappy...so I replaced it... more for visual than anything
__________________
Mongo...aka Greg

1981 c30 lq9 nv4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
1955.1 ls3 tr6060...(under construction)(on hold)
2013 gmc z71. (daily driver)
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
mongocanfly is offline   Reply With Quote
Old 05-26-2018, 08:20 AM   #3
68gmsee
Active Member
 
68gmsee's Avatar
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,920
Re: Hood insulation: Why? Do you keep it or don't you?

Some say it's to keep the paint from fading due to engine heat others for noise. Because of the thinner metal used it's probably for both reasons but I see more vehicles with hood insulation that have faded hood paint than I did when they didn't have insulation.
__________________
68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...
68gmsee is offline   Reply With Quote
Old 05-26-2018, 04:56 PM   #4
Clyde65
1965 Chevy C10, 2005 4.8L/4l60
 
Clyde65's Avatar
 
Join Date: Aug 2004
Location: DFW Texas
Posts: 7,907
Re: Hood insulation: Why? Do you keep it or don't you?

All about engine noise!
__________________
Clyde65

Rebuild of Clyde
http://67-72chevytrucks.com/vboard/s...84#post8338184

69 Aristocrat Lo Liner build
http://67-72chevytrucks.com/vboard/s...84#post7561684



support our troops!
Clyde65 is offline   Reply With Quote
Old 06-02-2018, 03:06 AM   #5
toolboxchev
Registered User
 
Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 1,557
Re: Hood insulation: Why? Do you keep it or don't you?

I ripped that moisture trapping crap outta there. Now I can watch the tune on the engine just by driving down the road!
toolboxchev is online now   Reply With Quote
Old 06-06-2018, 12:05 PM   #6
GASoline71
"I ain't nobody, dork."
 
GASoline71's Avatar
 
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,430
Re: Hood insulation: Why? Do you keep it or don't you?

Mine didn't have any from the factory (1972), and I ain't adding any...

Plus... I happen to like engine noise.

Gary
__________________
'cuz chicks dig scars...

My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
GASoline71 is offline   Reply With Quote
Reply

Bookmarks

Tags
bystanders, heat, insulation, performance

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:01 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com