Are All 11 Blade Fans the Same?

North Coast Cab · North Coast Cab's Garage

I have an early (901) alternator & housing and a later one (911). Both have 11 blade fans. Are the fans interchangeable? I know the alternators and housings are different, but I can't tell with the fans.

John

Mysterytrain · 06-15-2007, 06:12 AM

John,
I think the actual castings are the same its the pulleys that are slighty different diameter and design. The early pully has 8 large holes in it. The later SC/turbo 11 blade has 16 small holes in it. I think the carrera pulley is also slotted. I know the pulleys can be removed and swapped around.

The last picture is the fan I have on my car. The early pulley was removed and replaced with a SC era pulley.

tcar · 06-15-2007, 08:03 AM

There are a couple different 11 blade fan outside diameters. I think the 78/9 SC has a smaller dia than others.

Do a search.

klaucke · 06-15-2007, 09:23 AM

There are 3 different 11-blade fan diameters used over the years. There is the 226mm used in 78-79 SC, and the 245mm used on most other years (before and after 78-79), and there is the very early 250mm fan (debatable when this was used 1965-196X, X=6,7,8?).

North Coast Cab · North Coast Cab's Garage

Thanks. I am switching from a 901 set-up to a 911 Carrera set-up and I can't get a belt to fit. I have a 725 and a 710, but they are both too big. I run a Clewett trigger wheel which is slightly undersized.
I used a 710 on the 901 set-up, but it is too big on the 911 set-up using either one of the pullies.

Mysterytrain · 06-15-2007, 11:37 AM

Yeah, sorry about that John..I thought we were just talking about the 245mm..and yes there was that oddball 250mm and the smaller 226mm
I'm using the larger 78/79 crank pulley and the smaller 80-83 fan pulley on my car. I'm using the original 78/ 79SC belt..725. For the record my fan was from a 901 housing. I just swapped the pulley. My current housing is a 930.106.102 0R that replaces the stock 78/79, 930-106-101-0R.

safe · safe's Garage

Quote:

Originally posted by Mysterytrain
John,
I think the actual castings are the same its the pulleys that are slighty different diameter and design. The early pully has 8 large holes in it. The later SC/turbo 11 blade has 16 small holes in it. I think the carrera pulley is also slotted. I know the pulleys can be removed and swapped around.

The last picture is the fan I have on my car. The early pulley was removed and replaced with a SC era pulley.

Do you have any cast partnumber on those?