Go Back   Corvette Forum > C1 & C2 Corvettes, 1953 - 1967 > C1 & C2 Corvettes
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C1 & C2 Corvettes
General C1 Corvette & C2 Corvette Discussion, Technical Info, Performance Upgrades, Project Builds, Restorations Sponsored by
Flaming River
Industries

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 09-01-2013, 02:37 AM   #1
raytex
CF Senior Member
 
raytex's Avatar
 
Member Since: Oct 2006
Location: Bonheiden Belgium Europe
Default Which fanblade should I use on 396/AC

My 65 car was original a 327 with factory air.
The 327 engine has been replaced with a 396 (Chevelle) in the mid 80s.

Which fanblade should I use not to have "heating" issues?
When I bought the car it was overheating, the previous owner installed a electric pull fan. This was with a 327 support, shroud and radiator.
I have removed the electric fan and installed a 396 shroud, radiator support (added the AC holes) and a BB aluminum radiator with a new AC condensor.

Should I use a 396 5 blade 17" or a 64-65 18" 7 blade or maybe a 66-67 18" 5 blade?

please advise

Ray
raytex is offline   Reply With Quote
Old 09-01-2013, 09:22 AM   #2
stingrayl76
CF Senior Member
 
stingrayl76's Avatar
 
Member Since: Jun 2003
Location: Grosse Ile MI
Default

Quote:
Originally Posted by raytex View Post
My 65 car was original a 327 with factory air.
The 327 engine has been replaced with a 396 (Chevelle) in the mid 80s.

Which fanblade should I use not to have "heating" issues?
When I bought the car it was overheating, the previous owner installed a electric pull fan. This was with a 327 support, shroud and radiator.
I have removed the electric fan and installed a 396 shroud, radiator support (added the AC holes) and a BB aluminum radiator with a new AC condensor.

Should I use a 396 5 blade 17" or a 64-65 18" 7 blade or maybe a 66-67 18" 5 blade?

please advise

Ray
I'm no expert but since you are using the 396 fan shroud, I would normally say to use the 396 5 blade fan. However, considering the added A/C you are going to need as much airflow as possible so you will need to determine which fan moves the most air and will clear the shroud. Hopefully someone can chime in ad provide the airflow information.
stingrayl76 is offline   Reply With Quote
Old 09-01-2013, 02:57 PM   #3
JohnZ
CF Senior Member
Support Corvetteforum!
 
Member Since: Oct 2000
Location: Washington Michigan
Default

Frequently, the fan used with A/C has deeper pitch (blade angle) than a non-A/C fan; although it may have the same number of blades, it will move a lot more air.

I'm not familiar with the 396 shroud/fan sizing, as that combination never had A/C - maybe one of the 396 guys will chime in with alternatives.
JohnZ is offline   Reply With Quote
Old 09-01-2013, 04:49 PM   #4
TheSaint
CF Senior Member
Support Corvetteforum!
 
TheSaint's Avatar
 
Member Since: Nov 2009
Location: 50 kilometers outside Oslo Norway
Default

Since it is a AC car it just as likely that it had a 7 blade fan according to the Vette Vues Fact Book
Well, i must say that the book have been wrong before..

Last edited by TheSaint; 09-01-2013 at 04:52 PM.
TheSaint is offline   Reply With Quote
Old 09-01-2013, 07:28 PM   #5
avideo
CF Senior Member
Support Corvetteforum!
 
avideo's Avatar
 
Member Since: Mar 2004
Location: Reno NV
Default You might want to consider a 17 or 18 Inch...

Seven Blade Flex fan to pull the maximum air through you radiator. Whatever is the largest size your radiator shroud will allow.
avideo is offline   Reply With Quote
Old 09-02-2013, 07:04 AM   #6
raytex
CF Senior Member
 
raytex's Avatar
 
Member Since: Oct 2006
Location: Bonheiden Belgium Europe
Default

Quote:
Originally Posted by avideo View Post
Seven Blade Flex fan to pull the maximum air through you radiator. Whatever is the largest size your radiator shroud will allow.
Ok thx I will just do that and meassure the fanshroud and see what is acceptable.
raytex is offline   Reply With Quote
Old 09-02-2013, 07:09 AM   #7
raytex
CF Senior Member
 
raytex's Avatar
 
Member Since: Oct 2006
Location: Bonheiden Belgium Europe
Default

Quote:
Originally Posted by TheSaint View Post
Since it is a AC car it just as likely that it had a 7 blade fan according to the Vette Vues Fact Book
Well, i must say that the book have been wrong before..
Of course it had a 7 blade , 34.5 degree pitch fan blade with the original shroud. When I got the car there was a plastic fan blade installed.
Now it has a 396 shroud, I will measure the max possible and either get a 64-65 18" 7 blade 34.5 degree pitch or the 396 17" 5 blade which also has a 34.5 if I understood correctly.

Clearnce fan blade to shroud should be how much?
1/2 inch?

Ray
raytex is offline   Reply With Quote
Old 09-02-2013, 09:27 AM   #8
67vetteal
CF Senior Member
 
67vetteal's Avatar
 
Member Since: Aug 2004
Location: Riverhead New York
Default

A 1/2" should do it. Any closer and your running the chance of it touching when you throw a few Hard Shifts! Our engine mounts do get softer through the years and allow the engine to rotate a little bit under strong acceleration. Al W.
67vetteal is offline   Reply With Quote
Old 09-05-2013, 05:07 PM   #9
TheSaint
CF Senior Member
Support Corvetteforum!
 
TheSaint's Avatar
 
Member Since: Nov 2009
Location: 50 kilometers outside Oslo Norway
Default

After what i have read it is not all "off course" factory AC cars had 7 blade fans.
Factory AC cars was delivered with a 5 blade fan because if they was out of 7 blade fans they installed 5 blade fans
That is what i read



Quote:
Originally Posted by raytex View Post
Of course it had a 7 blade , 34.5 degree pitch fan blade with the original shroud. When I got the car there was a plastic fan blade installed.
Now it has a 396 shroud, I will measure the max possible and either get a 64-65 18" 7 blade 34.5 degree pitch or the 396 17" 5 blade which also has a 34.5 if I understood correctly.

Clearnce fan blade to shroud should be how much?
1/2 inch?

Ray

Last edited by TheSaint; 09-05-2013 at 05:10 PM.
TheSaint is offline   Reply With Quote
Old 09-05-2013, 05:14 PM   #10
midyear
CF Senior Member
 
midyear's Avatar
 
Member Since: May 2002
Location: Hogansville ga
Default

I ran a 74-75 7 blade fan (notched blade) and heavy duty clutch on my 67 427 air car for years with out overheating issues, its been what I used on other big block cars to help them cool better as well. may not look right, but did the job.
midyear is offline   Reply With Quote
Old 09-06-2013, 12:04 PM   #11
raytex
CF Senior Member
 
raytex's Avatar
 
Member Since: Oct 2006
Location: Bonheiden Belgium Europe
Default

Quote:
Originally Posted by TheSaint View Post
After what i have read it is not all "off course" factory AC cars had 7 blade fans.
Factory AC cars was delivered with a 5 blade fan because if they was out of 7 blade fans they installed 5 blade fans
That is what i read
Then my problem is solved.
But why would they do that?
5 blade 24.5 degree pitch or 7 blade 34.5 degree pitch.
If GM does make an issue about the number of blades and the pitch degree of the fan
Guess any fan will do then.
raytex is offline   Reply With Quote
Old 09-07-2013, 04:28 PM   #12
TheSaint
CF Senior Member
Support Corvetteforum!
 
TheSaint's Avatar
 
Member Since: Nov 2009
Location: 50 kilometers outside Oslo Norway
Default

I think it was Noland Adams Volume 2 i read that they used 5 bladed fans if they did not have the correct 7 blades at hand


Quote:
Originally Posted by raytex View Post
Then my problem is solved.
But why would they do that?
5 blade 24.5 degree pitch or 7 blade 34.5 degree pitch.
If GM does make an issue about the number of blades and the pitch degree of the fan
Guess any fan will do then.
TheSaint is offline   Reply With Quote
Old 09-07-2013, 04:28 PM
 
Go Back   Corvette Forum > C1 & C2 Corvettes, 1953 - 1967 > C1 & C2 Corvettes
Reload this Page Which fanblade should I use on 396/AC
 
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
65 396 cooling Shvhd C1 & C2 Corvettes 21 07-06-2014 05:56 PM
Running warm again fred kay C1 & C2 Corvettes 22 05-23-2014 07:41 AM
DIY: Oil Preheater Install rockinSeat C6 Z06 Discussion 5 03-04-2014 10:04 PM
aparent over heating on a '66, 327-300 Bob 66 coupe C1 & C2 Corvettes 10 08-15-2013 08:34 AM
1965 396 radiator & shroud 2hrlygrams C1 & C2 Corvettes 5 04-08-2013 10:04 PM


All times are GMT -4. The time now is 03:08 AM.


Emails & Password Backup