reverse rotation fan
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Joined: May 2007
Posts: 666
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From: Newport Beach, Ca.
Car: 1988 Iroc
Engine: 383 TPI
Transmission: 700r4
Axle/Gears: BW 9 bolt 3.27
Re: reverse rotation fan
Gotta say that`s a first for me! I would assume you could just turn the fan over and mount it but there has to be more to it. There was a recent post about someone trying to do just what you asked and it was`nt going to work. Try doing a search at the top of the page.
Senior Member

Joined: Sep 2006
Posts: 747
Likes: 1
From: Reno, NV
Car: 1982 Z28 & 1967 RR/SS 396
Engine: ZZ383 & 375hp 396
Transmission: T56 & factory TH400
Axle/Gears: 9" ford & 12 bolt 4.10
Re: reverse rotation fan
I did a bunch or research on this when I converted my car to a serpentine belt from my stock v-belt system. I found out that the clutch fan is directional and you can't just turn the fan around and have it work for a reverse rotation water pump. I just ended up using a Stahl fan assembly.
I looked into clutch fan assemblies off the later model trucks but the rpm range that they are rated for will not work for my car. Truck clutch fans are designed for 4000 rpm max.
I looked into clutch fan assemblies off the later model trucks but the rpm range that they are rated for will not work for my car. Truck clutch fans are designed for 4000 rpm max.
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: reverse rotation fan
You're not going to have room to mount a clutch fan behind an electric fan, and it wouldn't make much difference in cooling if you did.
Supreme Member

Joined: Jun 2001
Posts: 9,550
Likes: 4
From: Charleston, SC
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
Re: reverse rotation fan
Warning: the following is a blunt opinion of MrDude... it will probably **** atleats one person off.
mechanical fans are for people too ignorant to just use an electrical fan.
mechanical fans are for people too ignorant to just use an electrical fan.
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: reverse rotation fan
Or too lazy to convert because they already have a perfectly working clutch fan.
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Joined: Jan 2005
Posts: 10,437
Likes: 500
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: reverse rotation fan
Mechanical fans are for people with trucks that need to stay cool pulling GCVWs of 10,000+ lbs, running in 105* temperatures, stopped in traffic, etc. My Van has a stock GM 4 core radiator with a 28" wide core, stock 7 blade reverse rotation clutch fan with a HD fan clutch. The engine runs 195-200* as viewed on a datalog at all times, with a 195* thermostat. I have one 10" pusher fan in front of the A/C condensor on the driverside to help the A/C keep its cool in the high heat. The helper fan is only wired to run if the engine is above 225* or the A/C blower fan is on high. The A/C blows 45-50* on a 100*+ day sitting in traffic. I should add that I have a monster transmission cooler on the passenger side in front of the A/C condensor AND a water/oil oil cooler like the thirdgens use, sandwiched between the block and the oil cooler. Cools my 425 FWHP 350 perfectly.
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