455 pontiac runs hot! What to do? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 03-17-2006, 02:36 PM
Registered User
 
Join Date: Feb 2006
Location: las vegas
Posts: 27
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
455 pontiac runs hot! What to do?

Howdy guys!

Well, just got my rebuilt 455 installed in the firebird. I've got an aluminum radiator.

While driving above 40mph, the engine runs real cool--160, but when you stop and idle in gear, the temp climbs. If you rev the engine up a little, it also tends to cool down, although at a slower pace. This leads me to believe the radiator is fine, but the fan is suspect. Right now I'm running a flex fan on an extension which puts it inside the factory shroud.

What should I do? Go to a clutch fan, or electric? Any ideas?

Jerry

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-17-2006, 03:41 PM
GoneNova/406's Avatar
Member
 
Join Date: Aug 2003
Location: columbus,ohio
Age: 59
Posts: 1,163
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
sounds like you have a problem with not enough air flow.personally i like to use the best electric fans i can afford.you can get very good ones at the junk yard off of newwer cars or i found an excellant deal on some pro comp electronics electric fans,roller rockers and varrious other things.the price seems to good to be true but i have bought 4 of the e. fans so far and they seem to fine,unless they quit working after a month.they have a 1 or 2 yr. warrantee on them though if you keep your reciepts.their at whiteperformance1 on ebay motors.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-17-2006, 04:55 PM
King of my Man-cave.
 
Last photo:
Join Date: Nov 2003
Location: Michigan
Age: 55
Posts: 2,901
Wiki Edits: 0

Thanks: 4
Thanked 15 Times in 12 Posts
Assuming that you did re-install the water pump tubes, check out this site:

http://www.wallaceracing.com/

There is information on making sure the water pump is properly set-up to provide good circulation.

Also, you may consider an aftermarket high-volume water pump, as 455 is a lot to cool with an OEM pump that was designed to cool from 301 to 455 cubic inches.

tom
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-21-2006, 09:21 PM
bullheimer's Avatar
NEVER use credit cards!
 

Last journal entry: car with tt2's, (stockers going back on)
Last photo:
Join Date: Jan 2002
Location: North of Seattle
Posts: 2,532
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 4 Posts
do you know if the block had been filled by someone else before you?

clutch fans use less HP that flex fans i'been told. you might need a bigger rad. maybe colder plugs? see what machine shop had to say? get anything out of it?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-22-2006, 10:38 AM
STUPID is as STUPID does...
 
Last wiki edit: Crankshaft Coalition Wiki Last photo:
Join Date: Nov 2003
Location: Stupidville, USA
Posts: 1,738
Wiki Edits: 1

Thanks: 11
Thanked 86 Times in 80 Posts
Make sure the fan is halfway (looking from the side of the shroud) in and out of the shroud. Flexfans are about the least efficient fan you can be running. There was a fan comparison in one of the mags a few years ago and the stock four blade fan from a 283 outperformed an aftermarket flexfan in both cooling and horsepower draw.
Before you start spending money on new radiators and custom pumps make sure the shroud and fan are optimized. Get a factory clutch style fan and be sure the positioning is correct as I stated above.
Mark
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last 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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
455 Pontiac Roller Engine? granprix76 Engine 16 02-20-2011 04:14 PM
gm th400 4 bolt- to- 455 pontiac.... how do i make it fit... 71_gto Transmission - Rearend 11 04-04-2008 07:18 AM
1967 pontiac 455 overheating brisk Engine 12 04-03-2008 11:17 PM
My 350 SBC (HO Engine) Runs hot barkmmi Engine 3 07-13-2003 10:21 AM
One hot 455, TOOO HOT parrothed69 Engine 2 11-21-2001 07:42 PM


All times are GMT -6. The time now is 05:29 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.