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 > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 03-22-2017, 12:39 AM   #1
BROWN 70
Registered User
 
BROWN 70's Avatar
 
Join Date: Aug 2010
Location: central oregon
Posts: 157
new hei

just bought a new summit hei. I thought id look it over and found there was no heat sink compound under the module. how can this module survive like that? has anyone else found this in a summit or other cheap hei? looks like I,ll make a trip to radio shack, to at least have a chance of this hei lasting a while. do you guys know if its called heat sink compound or something else? thanks, BROWN 70
BROWN 70 is online now   Reply With Quote
Old 03-22-2017, 09:39 AM   #2
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
Re: new hei

IIRC it's called dialectic grease.
geezer#99 is offline   Reply With Quote
Old 03-22-2017, 10:10 AM   #3
tdangle
Registered User
 
tdangle's Avatar
 
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,210
Re: new hei

It's best to get heat sink compound. It is a different makeup than dielectric grease which is meant more to seal electrical connections. heat sink compound is a blend of beryllium oxide and siloxane. and has a much higher thermal conductivity than dielectric grease (siloxane).
__________________
Terry

1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC
tdangle is offline   Reply With Quote
Old 03-22-2017, 10:35 AM   #4
Warrens69GMC
Registered User
 
Warrens69GMC's Avatar
 
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,622
Re: new hei

Autozone SL203

http://www.autozone.com/miscellaneou...archText=sl203
__________________
1969 307, t350
1950 Chevy Wagon
1978 Big 10
1967 C10, 250,3-OTT
Warrens69GMC is offline   Reply With Quote
Old 03-22-2017, 01:16 PM   #5
VetteVet
Msgt USAF Ret

 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,718
Re: new hei

I believe they use the same stuff under the processors in computer motherboards as well. Your local computer shop may have it on hand.
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 03-22-2017, 01:36 PM   #6
BROWN 70
Registered User
 
BROWN 70's Avatar
 
Join Date: Aug 2010
Location: central oregon
Posts: 157
Smile Re: new hei

thank you all, great info I,ll go to either radio shack or autozone. BROWN 70
BROWN 70 is online now   Reply With Quote
Old 03-22-2017, 03:23 PM   #7
'68OrangeSunshine
Senior Member
 
'68OrangeSunshine's Avatar
 
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,504
Re: new hei

Quote:
Originally Posted by tdangle View Post
It's best to get heat sink compound. It is a different makeup than dielectric grease which is meant more to seal electrical connections. heat sink compound is a blend of beryllium oxide and siloxane. and has a much higher thermal conductivity than dielectric grease (siloxane).
I believe you meant "thermal [NON-] conductivity''.
Sometimes it's hard to tell if you have the right stuff in the 2'' packet they give you, and a lot of autoparts store clerks [kids] don't know the difference. I know I didn't, when I blew thru a string of modules one hot summer in Tucson, until I got straightened out about the ''right stuff''.
__________________


Every 25 years I like to rebuild that 292, whether it needs it or not.
'68OrangeSunshine is online now   Reply With Quote
Old 03-22-2017, 05:24 PM   #8
truckster
Senior Member
 
truckster's Avatar
 
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,976
Re: new hei

Quote:
Originally Posted by '68OrangeSunshine View Post
I believe you meant "thermal [NON-] conductivity''.
Sometimes it's hard to tell if you have the right stuff in the 2'' packet they give you, and a lot of autoparts store clerks [kids] don't know the difference. I know I didn't, when I blew thru a string of modules one hot summer in Tucson, until I got straightened out about the ''right stuff''.
Believe it or not, it is conductivity. You want the heat sink compound to draw heat away from the module.
truckster is offline   Reply With Quote
Old 03-22-2017, 06:42 PM   #9
GASoline71
"I ain't nobody, dork."
 
GASoline71's Avatar
 
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,971
Re: new hei

Quote:
Originally Posted by VetteVet View Post
I believe they use the same stuff under the processors in computer motherboards as well. Your local computer shop may have it on hand.
I always buy heat sink compound from Radio Shack.

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"
Quote:
Originally Posted by cableguy0 View Post
Its cheaper to listen to advice given when you ask for help than it is to ignore everyone and wait for carnage.
GASoline71 is offline   Reply With Quote
Old 03-22-2017, 07:21 PM   #10
hjewell2
Registered User
 
hjewell2's Avatar
 
Join Date: May 2011
Location: mich
Posts: 655
Re: new hei

Yes get heat sink compound. summit brand HEI has a bad rap about the wires under the cap not crimped correctly and pulling loose just an FYI.
hjewell2 is offline   Reply With Quote
Old 03-22-2017, 07:51 PM   #11
BROWN 70
Registered User
 
BROWN 70's Avatar
 
Join Date: Aug 2010
Location: central oregon
Posts: 157
Re: new hei

this is what I found at radio shack. it has zinc oxide and polydimethyl siloxane, hope this works well. thanks again for all the input. BROWN 70
Attached Images
 
BROWN 70 is online now   Reply With Quote
Old 03-22-2017, 08:11 PM   #12
'68OrangeSunshine
Senior Member
 
'68OrangeSunshine's Avatar
 
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,504
Re: new hei

Quote:
Originally Posted by truckster View Post
Believe it or not, it is conductivity. You want the heat sink compound to draw heat away from the module.
OK. I thought it was more of an insulating thing. Old dog that I am, I'm still learning.

Also all the Radio Shacks in my area are just Sprint stores. I went it one and asked for a cigarette lighter plug, as I wanted temporary 12V DC power for a CB radio. Kid tried to sell me a cigar hole charger for USB devices. When I said it was for CB power, he just looked at me and blinked like a cow.
__________________


Every 25 years I like to rebuild that 292, whether it needs it or not.

Last edited by '68OrangeSunshine; 03-22-2017 at 08:17 PM.
'68OrangeSunshine is online now   Reply With Quote
Reply

Bookmarks

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 08:27 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com