running too COOL? - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 26 (permalink) Old 08-06-2012, 01:54 PM Thread Starter
 
Instg8ter's Avatar
 
Join Date: Sep 2010
Location: Near Detroit
Posts: 3,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
running too COOL?

I know this is not usually the problem with our Pontiacs but with the three core radiator and the tight clearance on the water pump divider the beast is running no higher than 165 with a 165 thermostat even when pushing it and on hot days (88). I am worried running this cool i am not getting peak efficiency on combustion and am gonna be fine tuning on wednesday should i grab a 185 stat to get the fires burning a little hotter?

Instg8ter is online now  
Sponsored Links
Advertisement
 
post #2 of 26 (permalink) Old 08-06-2012, 03:02 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,491
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
165 is a tad too cool, IMO. 180-195 is where you ideally want to run. As I've said, even 210-215 is actually ok. Try the hotter 'stat. You must have one hell of a cooling system! Congrats on that one, not easy to do!
geeteeohguy is offline  
post #3 of 26 (permalink) Old 08-06-2012, 04:01 PM Thread Starter
 
Instg8ter's Avatar
 
Join Date: Sep 2010
Location: Near Detroit
Posts: 3,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Thanks GeeTee i seem to remember us having this talk before and wanted to make sure, yes i have been running it through teh paces and took it on a med length drive today over a few hills and pushing it up the rev range for break-in and cannot get it to budge over 165, will grab a 185 tomorrow.

Instg8ter is online now  
 
post #4 of 26 (permalink) Old 08-06-2012, 05:55 PM
Former Moderator
 
68greengoat's Avatar
 
Join Date: Sep 2005
Location: Northern Wisconsin
Posts: 3,523
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 1 Post(s)
My bud's '68 400 runs at 165. I was shocked too. I'm right around 190.



SOLD.....
462ci, 4spd
Performer Intake, Mild Cam
Pertronix Ignitor III
Accel Super Coil, Accel 8.8mm Wires
68greengoat is offline  
post #5 of 26 (permalink) Old 08-06-2012, 06:59 PM
 
Join Date: Oct 2007
Location: Long Island NY
Posts: 4,702
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Garage
Brian, I woulsd go to a 180* stat also....I always thought it was impossible to get a Pontiac to run that cool! I have a 160* stat in mine....It gets to 180-190with NO fans running...when I turn on 1 fan, it cools to 160* and stays there....if i turn on both fans....the Temp goes to 150* and the stat opens and closes.......then after a while stabilizes......I have tha IAII block (bigger cooling passages/siamese cylinder...an E-brock pump, 2000 x 2 =4000 cfm of fan, and a 1.5 inch 2 row aluminum radiator....Couldn't beleive it! Eric



Eric Animal is offline  
post #6 of 26 (permalink) Old 08-06-2012, 07:14 PM Thread Starter
 
Instg8ter's Avatar
 
Join Date: Sep 2010
Location: Near Detroit
Posts: 3,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
just did all of the normal stuff from the posts on here on mine, i did have the larger clutch fan and when i got the 18" shroud it would not fit so i trimmed off just enough of the fan tips to clear it with 1/8" gap. I then shimmed it to be half covering the blade and did the usual water pump mod. Other than that just a champion 3 row alum. radiator. Will post vid of the new set-up when i get it fine tuned on wed., have to rejet the 750 up as its starving for gas....<grin>. gonna break the motor in on the 750 while a friend machines the water neck down for the dual quads....then she will be able to eat.

Instg8ter is online now  
post #7 of 26 (permalink) Old 08-06-2012, 07:31 PM
 
Join Date: Oct 2007
Location: Long Island NY
Posts: 4,702
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Garage
Brian, Sounds good!......just to be safe.....can you verify an accurate temp gauge....



Attached Thumbnails
Click image for larger version

Name:	THROTTLELINK 004.jpg
Views:	120
Size:	1.38 MB
ID:	15423  
Eric Animal is offline  
post #8 of 26 (permalink) Old 08-07-2012, 07:40 AM Thread Starter
 
Instg8ter's Avatar
 
Join Date: Sep 2010
Location: Near Detroit
Posts: 3,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
will do that with heat meter E, on my list of things to get today. man thats some tricky linkage on your carbs, i may have to have a waterneck fabbed if this one won't machine down enough (always something).

Instg8ter is online now  
post #9 of 26 (permalink) Old 08-08-2012, 09:37 AM
 
Join Date: Oct 2007
Location: Long Island NY
Posts: 4,702
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Garage
Not familiar with your set up....can you mill a little off the manifold........there are other options also....



Eric Animal is offline  
post #10 of 26 (permalink) Old 08-08-2012, 09:39 AM
 
Join Date: Oct 2007
Location: Long Island NY
Posts: 4,702
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Garage
The carb linkage is a bit tricky.....and that was before we put the TPS on the rear carb!!!!!.....E



Eric Animal is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
How cool is this... Instg8ter 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 1 02-29-2012 12:12 PM
A cool kit car I would like to own GM4life The Lounge 10 05-03-2010 10:58 PM
Cool Car...Huh? jbranontn 1964-1974 Tempest, Lemans & GTO General Discussion 15 03-06-2009 12:56 AM
Cool, Cool, Coolsville. PEARL JAM The Lounge 3 04-07-2007 08:55 AM
Cool Vid YeloTXGoat38 Audio & Video Clips 3 03-24-2007 07:49 AM

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome