Fan Clutch Selection

Topic: Fan Clutch Selection (Read 9053 times) previous topic - next topic

Fan Clutch Selection

Reply #30 – August 20, 2014, 03:28:48 PM

So to update after installation: Holy shiznit, why did I ever use an electric fan? My A/C is colder and the car can idle with ease without the load from the e-fan. YMMV but I have a fairly aggressive cam and even with a 130 amp alternator the load of the A/C and fan both kicking on forced me to run an excessively high idle speed or alternatively enriching the A/F ratio to keep the car from stumbling. Temperature wise the engine stays at 195 which just so happens to coincide with the temperature rating of the thermostat, so I'm pretty happy as well there. If you're not drag racing, or racing, and want to retain your A/C (especially if you're running 134a) I'd highly recommend using this setup or something similar. I'm not running an automatic transmission so the standard duty clutch seems to work fine for me, but YMMV if you've got some high stall non-lockup AOD and are running A/C.

I'll be doing a longer road test later tonight and tomorrow so if anything goes awry I'll be sure to let you all know.

In case anyone wishes to duplicate my setup and retain a traditional clutch fan, here are the parts I used:

9 Bladed reverse rotation fan from a 1999 to 2004 Chevy Silverado

Hayden Standard Duty clutch 2739* (*I think) for a 1995 Chevy Blazer 4.3

87-88 Thunderbird/Cougar Fan shroud

Fan Clutch Selection

Reply #31 – August 20, 2014, 05:52:34 PM

Quote from: GrannysBird;436950

So a little information for yall: A mustang fan is much smaller in diameter than whatever came on our cars as can be seen in the photo below.

So yup. At this point in time I guess I'm either waiting to grab my other fan shroud sitting at my buddies out of town or grabbing a 20 inch fan off of another vehicle.

Also, I know this is a small community, but I feel like this forum would benefit from either some moderation or some guidelines. If someone wanted to search for information about fan clutches they'd have to sift through 2 pages of irrelevant content just to follow the actual thread. Maybe it's just irksome to me, sigh...

Quote from: ZondaC12;436953

That wavy "flower" shape in the middle of that fan hub doesn't look right.

I bought a 9-blade Mustang fan for my black cougar, I also thought initially it was small...but I'm pretty sure it fits inside the shroud the same way the one I had did.
I'm out of town now but I'll look at it when I get home. I swear I thought it was small when it came in the mail but then I stacked it on top of my stock 7-blade and it was the same circle...

I've got a Mustang 9 blade fan I ordered from Mustangs Unlimited in my car. It was the same size as the stock 7 blade fan. You can see it in this picture.

With this setup (180* thermostat, Police Interceptor fan clutch, 9 blade HO fan, aluminum radiator with 2 1" rows) the car runs 180-185* all the time. Doesn't matter what outside temperature or if the A/C is on.

Fan Clutch Selection

Reply #32 – August 20, 2014, 08:50:34 PM

Hay if anyone wants a 4.3 clutch let me know. I have a couple of HD AC ones in stock. I never use them and i have brand new ones. I am willing to let them go CHEAP. If a clutch fan is your thing the 4.3 clutch is the one that is why i used to stock them. But i have not used one in years. Have a great evening.

Fan Clutch Selection

Reply #33 – August 26, 2014, 07:39:30 PM

The Mustang fan has a smaller diameter overall, however the blades themselves measure the same size. It's the center section that is larger. That being said, the 9 blade I put in wasn't Too much smaller than the stock 7 blade. Observe: