Pulley Diameters and Overheating!! - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
LinkBack Thread Tools
post #1 of 7 (permalink) Old 08-07-2015, 07:38 AM Thread Starter
Registered User
 
Join Date: Dec 2013
Location: Phoenix AZ
Posts: 83
Pulley Diameters and Overheating!!

Hi Everyone,

I am looking for some guidance on the proper pulley set for the 302 in my '68 Falcon. Right now, the car slowly overheats and will not recover. I was reading up on pulley diameters and how it relates to the proper operation of the accessories but am still a bit confused on which pulley should be what size. I currently have a 6" water pump pulley, a 6" crank pulley and a 3" alternator pulley. This was what was on the car when I bought it back from the guy I sold it to. I'm not convinced that the W/P pulley and crank pulley should be the same diameter but I'm not sure if the W/P pulley should be smaller or larger than the crank pulley. Any guidance you all could give would be appreciated. It's frustrating that I can't even drive the car for any length of time. I also set the timing at 10* initial but my balancer only goes to 30*. I'm certain it's close enough at the moment to at least drive it so i think the overheating problem lies in the pulleys.

Thanks
John
Bad68ford is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 08-07-2015, 05:32 PM
Registered User
 
Join Date: Aug 2004
Posts: 97
Re: Pulley Diameters and Overheating!!

Hello

Have you determined if the thermostat is working?
or even there?

How's the flow threw the radiator?

Do you have a fan shroud?

PAUL
1990 #12 T-Bird Stock Car
1996 T-bird (to replace the 90)
1985 T-Bird Coupe (work in progress)
tbirdtess is offline  
post #3 of 7 (permalink) Old 08-07-2015, 06:50 PM
Registered User
 
Join Date: May 2008
Posts: 578
Re: Pulley Diameters and Overheating!!

Quote:
Originally Posted by Bad68ford View Post
Hi Everyone,

I am looking for some guidance on the proper pulley set for the 302 in my '68 Falcon. Right now, the car slowly overheats and will not recover. I was reading up on pulley diameters and how it relates to the proper operation of the accessories but am still a bit confused on which pulley should be what size. I currently have a 6" water pump pulley, a 6" crank pulley and a 3" alternator pulley. This was what was on the car when I bought it back from the guy I sold it to. I'm not convinced that the W/P pulley and crank pulley should be the same diameter but I'm not sure if the W/P pulley should be smaller or larger than the crank pulley. Any guidance you all could give would be appreciated. It's frustrating that I can't even drive the car for any length of time. I also set the timing at 10* initial but my balancer only goes to 30*. I'm certain it's close enough at the moment to at least drive it so i think the overheating problem lies in the pulleys.

Thanks
John
I don't think there should be any problem with the two 6 inch! it sounds like you have something else wrong! How good is your rad? that kind of water pump is it causing cavitation?
MY TWO STANGS is offline  
 
post #4 of 7 (permalink) Old 08-08-2015, 06:48 AM Thread Starter
Registered User
 
Join Date: Dec 2013
Location: Phoenix AZ
Posts: 83
Re: Pulley Diameters and Overheating!!

Quote:
Originally Posted by tbirdtess View Post
Hello

Have you determined if the thermostat is working?
or even there?

How's the flow threw the radiator?

Do you have a fan shroud?
Hi and thanks for the response.

I do have a fan shroud, 15" flex fan, thermostat is new and 180*, radiator flow is good, water pump is new.
Bad68ford is offline  
post #5 of 7 (permalink) Old 08-08-2015, 06:50 AM Thread Starter
Registered User
 
Join Date: Dec 2013
Location: Phoenix AZ
Posts: 83
Re: Pulley Diameters and Overheating!!

Quote:
Originally Posted by MY TWO STANGS View Post
I don't think there should be any problem with the two 6 inch! it sounds like you have something else wrong! How good is your rad? that kind of water pump is it causing cavitation?
Thanks for the response.

Radiator is good (as far as I can tell) and the water pump is a stock replacement from Autozone. It's a cast iron pump, not aluminum.
Bad68ford is offline  
post #6 of 7 (permalink) Old 08-08-2015, 06:02 PM
Registered User
 
Join Date: Aug 2004
Posts: 97
Re: Pulley Diameters and Overheating!!

Hello

This should be a standard rotation water pump.
is the fan the correct direction? is it about an inch from the radiator?

IF it is recheck the thermostat. could be broken or stuck open.

A smaller lower pulley will drive the pump faster. not always a good thing.
a larger upper pulley will drive pump slower.

tbirdtess

PAUL
1990 #12 T-Bird Stock Car
1996 T-bird (to replace the 90)
1985 T-Bird Coupe (work in progress)
tbirdtess is offline  
post #7 of 7 (permalink) Old 08-10-2015, 06:16 PM Thread Starter
Registered User
 
Join Date: Dec 2013
Location: Phoenix AZ
Posts: 83
Re: Pulley Diameters and Overheating!!

Quote:
Originally Posted by tbirdtess View Post
Hello

This should be a standard rotation water pump.
is the fan the correct direction? is it about an inch from the radiator?

IF it is recheck the thermostat. could be broken or stuck open.

A smaller lower pulley will drive the pump faster. not always a good thing.
a larger upper pulley will drive pump slower.

tbirdtess
Hi and thanks for the response.

Thermostat is new as is the water pump. I checked the 'stat to make sure it opened at 180*. I spoke to an aftermarket pulley manufacturer the other day and they said that the pump pulley and the crank pulley wouldn't pose a problem if they are the same diameter and in fact they said this would be optimal for cooling purposes.

Fan is 15" diameter flex and is a about an inch away from the radiator give or take a 1/4.

I am currently in the process of flushing the entire system and starting over. I read a few posts from other forums saying that using vinegar to clear out the system was safe and effective. I'm going to try it and see what happens. Has anyone else tried this and if so what were your results?
Bad68ford is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Muscle Forums : Ford Muscle Cars Tech 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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Need out-of-the-box piston diameters for various brands KOstratavarius All Ford Techboard 5 10-23-2010 02:01 PM
'68-'69 gauge diameters ? 68FalconSC Torino Pages 4 05-20-2009 12:43 AM
Educate me on 8" drum center/hub diameters Diced All Ford Techboard 3 07-25-2008 12:30 AM
Ford 8 and 9\" Axel diameters BRDVPRA All Ford Techboard 3 12-15-2005 04:24 PM
Question about wrist pin diameters... Humphrey351 All Ford Techboard 2 10-05-2003 08:29 PM

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