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 07-17-2003, 12:26 AM   #1
RAT-AT-TACH
Registered User
 
RAT-AT-TACH's Avatar
 
Join Date: May 2003
Location: shawnigan lake b.c. canada
Posts: 287
heat isolator?

i just had my burb tuned up yester day ,and she started pinging,i took it back today and the mec put the timing light on it and brought it in a touch,then he tested the temp in my float bowl(edelbrock ps 800) which was at 110-115 he said it should be no more than 85, so im just burning my fuel into vapor at such a high temp,im going to be putting a heat isolator on the carb tomorro to keep it cool then he will be able to tune the timing in better.
does this sound right to anyone?

i should mention the motor is a modified 402 bb .
RAT-AT-TACH is offline   Reply With Quote
Old 07-18-2003, 04:13 AM   #2
jimfulco
Registered User
 
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
If the temp should not be more than 85, then what temp is it when it's 95* outside & the truck has been outside for years but it runs fine?
jimfulco is offline   Reply With Quote
Old 07-18-2003, 11:54 AM   #3
ddsmith
Glowing since 1978
 
ddsmith's Avatar
 
Join Date: Mar 2001
Location: Lusby,MD,USA
Posts: 532
I do agree that a hot carb is a bad thing but I don't think those temps make sense. The old vettes had a heat insulator and a sheet metal plate that mounted under the carb to keep radiant heat off the carb float bowls. You could probably fashion a similar heat shield if you felt it would help. It seems to me that the truck would just run a little rich when hot outside or in stop and go traffic. The big thing that I see as a problem is the percolation out the carb vents when you stop the engine after running it on a hot day. The vapor bubbles carry raw gas up and out the vents and into the intake. This in turn create a big PITA for starting and potentially shortens engine life if raw gas washes the cylinder walls down for you.
__________________
66 Chevy C30 Stakebody Dump, PS,PB, 327cu in
71 Corvette Coupe 454 4 speed
69 Chevy C20 Custom Camper
ddsmith is offline   Reply With Quote
Old 07-18-2003, 03:55 PM   #4
cdowns
Senior Member
 
cdowns's Avatar
 
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
i think a heat isolator is a good thing to use in fact i'm pretty sure edelbrock reccomens using one why they dont include one with their carbs stumps me
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane

MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF

DONT BELIEVE EVERYTHING YOU THINK

TAKE MY ADVISE;I DON'T USE IT ANYWAY
cdowns is offline   Reply With Quote
Old 07-18-2003, 04:32 PM   #5
Gotta71C20
Registered User
 
Join Date: Dec 2000
Location: Belfair, Wa. USA
Posts: 80
I think you should find a new mechanic. The one you have is an idiot. Larry
Gotta71C20 is offline   Reply With Quote
Reply

Bookmarks


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 06:13 AM.


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