Flex Fan Direction - 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 12-10-2012, 07:24 AM
Registered User
 
Last photo:
Join Date: Sep 2012
Posts: 32
Wiki Edits: 0

Thanks: 3
Thanked 0 Times in 0 Posts
Flex Fan Direction

I'm a little confused with the way the flex fan works on a V8. Why does it blow engine heat towards your radiator instead of sucking cold air through your radiator. What happens when you drive and the natural flow of air onto the radiator flows towards your engine but the fan still blows air forward. Does not make sense does it.
Attached Thumbnails
Click image for larger version

Name:	Fan.png
Views:	71
Size:	18.9 KB
ID:	69720  

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-10-2012, 07:40 AM
gearheadslife's Avatar
MentalMuffinMan
 
Last photo:
Join Date: Nov 2012
Posts: 2,045
Wiki Edits: 0

Thanks: 84
Thanked 227 Times in 214 Posts
Quote:
Originally Posted by Hotrod_Ford View Post
I'm a little confused with the way the flex fan works on a V8. Why does it blow engine heat towards your radiator instead of sucking cold air through your radiator. What happens when you drive and the natural flow of air onto the radiator flows towards your engine but the fan still blows air forward. Does not make sense does it.
it doesn't UNLESS you put a reverse rotation fam on a v belt front dress.
lots of engines when they went to one belt systems (serp) the water pump goes in reverse... even tho. you can bolt on the older pump and fans.. neither will cool all that well ,if at all
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-10-2012, 07:42 AM
delawarebill's Avatar
Registered User
 
Last photo:
Join Date: Mar 2009
Location: delaware
Posts: 1,207
Wiki Edits: 0

Thanks: 14
Thanked 58 Times in 58 Posts
Huh ????

what veh are u talking about first... but as far as i know the fan attached to the engine is a puller and u have a pusher in the wrong place... if u got a sbc then engine turns in a c/w direction looking at the front of engine crank, so the fan will also turn c/w. now still at the front of car with a fan blade at 12 o'clock the closest part of the fan is on the right, closest part to the front of car or rad.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-10-2012, 10:17 AM
sedanbob's Avatar
Registered User
 
Last photo:
Join Date: Oct 2008
Location: St. Louis
Age: 65
Posts: 625
Wiki Edits: 0

Thanks: 60
Thanked 80 Times in 77 Posts
I have an sbc with a serpentine belt system - it uses a reverse rotation water pump. If the OP's fan pushes air then he has the wrong fan blade for his setup (regular or reversed).
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-10-2012, 11:09 AM
Registered User
 
Last wiki edit: General Motors transmissions Last photo:
Join Date: Mar 2006
Location: near Yellowstone park
Posts: 4,209
Wiki Edits: 27

Thanks: 11
Thanked 233 Times in 219 Posts
bolt holes

wrong fans sometimes work ok at slow speed then not let air flow at highway speeds. I even heard of one guy that rat tail filed the holes so the Wrong fan could bolt on. actually the reverse rotation water pumps were designed to pump water the intended direction
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-10-2012, 02:15 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by Hotrod_Ford View Post
I'm a little confused with the way the flex fan works on a V8. Why does it blow engine heat towards your radiator instead of sucking cold air through your radiator. What happens when you drive and the natural flow of air onto the radiator flows towards your engine but the fan still blows air forward. Does not make sense does it.
A correctly orientated engine-mounted fan pulls air through the radiator, as has been said. If yours is trying to push air towards the radiator you have to reverse the pitch of the fan blades.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-10-2012, 04:05 PM
NEW INTERIORS's Avatar
Believe in yourself !!!!!!
 

Last journal entry: 41 WILLYS FRAME
Last photo:
Join Date: Jul 2007
Location: In My Shop..
Age: 49
Posts: 9,999
Wiki Edits: 0

Thanks: 1,141
Thanked 491 Times in 365 Posts
If it's a fan that can't be reverse then you need to install it in front of the rad..Blowing in.. If it can be reversed, Then reverse it and install it behind the rad.. It work's much better on the inside sucking air from the front..
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-10-2012, 11:38 PM
Registered User
 
Last photo:
Join Date: Sep 2012
Posts: 32
Wiki Edits: 0

Thanks: 3
Thanked 0 Times in 0 Posts
I totally agree with all of you. Thank you for the confirmation. It is a small block turning c/w if you look from the front. The blade however has a 'front' and 'back' stamped on it and if I would connect it as indicated it would blow forward instead of suck through the radiator. I see no problem in reversing the fan.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-11-2012, 12:19 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Your fan was used on a serpentine set up and you have V-belts (or vice versa), so you're going to need a different fan altogether. Maybe that's what you meant...

The good thing is you caught it early before overheating the engine or getting stranded somewhere.
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
question about old heater fan direction yragat Electrical 16 10-04-2011 09:32 AM
fan shroud flex fan and water wetter for valiant elcaminodragster Engine 15 09-05-2009 09:52 PM
electric fan direction yragat Hotrodding Basics 44 02-23-2007 08:52 AM
Flex Fan ? 18-FEVR Engine 5 05-27-2005 09:24 AM
flex fan 75sprintguy Engine 42 03-05-2004 09:21 PM


All times are GMT -6. The time now is 07:42 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.