471 blower engine overheat - 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 04-13-2008, 02:09 PM
Registered User
 
Join Date: Apr 2008
Location: California
Posts: 1
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
471 blower engine overheat

Hi I have a 383 stroker with a 4-71 blower the carb is a Carter AFB I am not sure about the jet size and rod size but I think this may be running to lean. Does anyone know the size of the jets and rods or should I get an new carb?
Mike

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-13-2008, 07:22 PM
Registered User
 
Last photo:
Join Date: Jan 2006
Location: cornelius
Posts: 694
Wiki Edits: 0

Thanks: 42
Thanked 12 Times in 12 Posts
First thing I would do is get an A/F gauge especially with a blower. You may be surprised by the results. My Edelbroke never ran consistent. It would go from pig rich to too lean with just the slightest tap on the gas. All the tuning in the world and I could never get it dialed in. I finally gave up and got a Predator

Whats the history of the engine? Is it new to you? Did you build it? Do you have an electric or Mechanical fan? with or without a shroud?

Jordon
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-13-2008, 08:21 PM
carsavvycook's Avatar
My 2 cents worth
 
Last photo:
Join Date: Sep 2007
Location: Lakeside, CA
Age: 57
Posts: 2,855
Wiki Edits: 3

Thanks: 2
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by acapulco1946
Hi I have a 383 stroker with a 4-71 blower the carb is a Carter AFB I am not sure about the jet size and rod size but I think this may be running to lean. Does anyone know the size of the jets and rods or should I get an new carb?
Mike
What carb number, cfm. etc. info do you have? You will have to eventually pull the carb and get the jet and metering rod sizes in it and the color of the step-up spring, to get any real helpful information.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-14-2008, 08:19 AM
MARTINSR's Avatar
Brian Martin,Freelance adviser
 
Last photo:
Join Date: Jun 2004
Location: San francisco bay area
Age: 55
Posts: 13,132
Wiki Edits: 0

Thanks: 1,304
Thanked 1,145 Times in 1,013 Posts
First lets discuss the rad, fans and shrouds. If there is a hood on the car, all of these are factors in engine overheating. Was it a fresh build? Was there rust in the block? There is much to discuss when you talk about overheating.

Brian
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-15-2008, 09:14 AM
lets cut it up's Avatar
Registered User
 
Last photo:
Join Date: Oct 2007
Posts: 1,468
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by acapulco1946
Hi I have a 383 stroker with a 4-71 blower the carb is a Carter AFB I am not sure about the jet size and rod size but I think this may be running to lean. Does anyone know the size of the jets and rods or should I get an new carb?
Mike

I would first check your cooling system. Then the fuel system. Is running hot during normal conditions or only under boost? I personally would toss the carter and get either a boost referenced Holley(you can get then in the box now) or a predator (they kinda funny looking ). Start with the most obvious things that could make it over heat first. JMO. TIm
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-15-2008, 05:36 PM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 62
Posts: 16,883
Wiki Edits: 5

Thanks: 20
Thanked 254 Times in 207 Posts
moving this to engine........
__________________
Ontario Rodders

Budget RVs
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-15-2008, 07:59 PM
BORTI's Avatar
BLOWN 357
 
Last photo:
Join Date: Apr 2008
Location: SAN PEDRO
Age: 43
Posts: 126
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
engine overheating

First thing to check timing advance curve,make sure its right.I chased a similar problem in my blown small block.Locked the dist. out,runs like a beast now.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-16-2008, 08:32 AM
XNTRCI-T's Avatar
AKA Lee in KC
 
Last photo:
Join Date: Apr 2006
Location: Overland Park, KS
Age: 66
Posts: 530
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
A 4-71 is a pretty small blower for a 383. To produce any boost at all the 4-71 would need to be overdriven quite a bit (10%-20%). This is going to add a lot of heat to the intake charge. Fuel mixture and ignition timing are going to be very critical.

Do you know what the drive ratio is on your blower? Count the teeth on the crank pulley and the drive pulley, then divide the number of teeth on the crank pulley by the number of teeth on the drive pulley. Let us know what you come up with.
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
setting points on sb chevy frackster66 Electrical 23 01-07-2014 05:50 PM
Whats the correct temperature my 350 should be running at? batman09 Engine 101 10-23-2005 12:29 PM
Rebuilt Engine Squeaking, Driving me Nuts! BH69Camaro Engine 24 04-22-2005 08:51 PM
Will no cooling fan overheat an engine? TheRedRS Engine 3 09-09-2004 09:04 PM
New Engine Built & Dyno'd babe_n_indy Engine 69 09-09-2004 07:26 PM


All times are GMT -6. The time now is 12:11 AM.


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.