Mechanical / belt driven fan ?
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Mechanical / belt driven fan ? I would like to use belt driven fan in my project. No any other reason than just looks. Would it work if use standard truck motor reverse rotation water pump and machine adapter to fit 70's visco/thermo clutch on it. Then just flip the fan blade ?
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Joined: Oct 2006
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From: Euless, TX
For period correct look find a 5 or 7 blade metal blade from an Express van or 4.3 GMT400 truck.
The S-series blazer with 4.3 has a reverse rotation fan blade that matches a SBC G-body fan shroud nicely.
I don't know if the LS water pump will center the blade relative to the SBC location.
But I wouldn't rule out a thermo clutch fan. Knowing your fan won't die in the desert relaxes the nerves.
And stop with the Flex-A-Lite horsepower numbers BS, please.
I don't know if the LS water pump will center the blade relative to the SBC location.
But I wouldn't rule out a thermo clutch fan. Knowing your fan won't die in the desert relaxes the nerves.
And stop with the Flex-A-Lite horsepower numbers BS, please.
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Not even close. Fully coupled Duramax fan cost me 12 hp at the tires. The reason that is important is that fan is a massive 21" fan, with something like 9 steeply pitched blades.
For period correct look find a 5 or 7 blade metal blade from an Express van or 4.3 GMT400 truck.
For period correct look find a 5 or 7 blade metal blade from an Express van or 4.3 GMT400 truck.
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TECH Resident
Joined: Oct 2006
Posts: 993
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From: Euless, TX
You realize I never said the Duramax fan is on a diesel. It is on a small block 350 Vortec in an Express van and got pulled to 5,800 rpm. Duramax fan is a clutch fan and the clutch I used was a Napa HD thermal replacement for a 6.0L Trailblazer SS. Biggest loss of power was in the 4,500 rpm range. I run a 30% underdrive crank pulley but the fan is still overdriven in relation to the crankshaft. Even pulling a heavy trailer I have not seen the engine run hotter than about 190°F. You can feel when the fan kicks in fully but 99% of the time ot basically freewheels on the end of the water pump and only locks when the engine is pulling hard at slow speeds.
Last edited by Fast355; Aug 21, 2017 at 08:25 PM.