340dustr
Member
What do you think is better for cooling at low speeds, factory 5 blade fan with clutch, or solid flex fan 6 blade w no clutch. Car is 70 Duster 340 stock motor.
rad fan questions
- Thread starter 340dustr
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skep419
5.9 Magnum 4 speed afficionado
never had good luck with flex fans. I would say the 5 blade with a clutch. The key is getting the correct fan shroud.
ir3333
Well-Known Member
clutch fans only turn about 80% of crank speed,so move less air at slow speeds and
they are a ton of weight on the end of the water pump.
flex fans are avail. now rated to 10,000 rpm.
The pitch and number of blades also should be considered
they are a ton of weight on the end of the water pump.
flex fans are avail. now rated to 10,000 rpm.
The pitch and number of blades also should be considered
340dustr
Member
do you know what style flex fan could be used-max diameter, number of blades, where to buy?
ir3333
Well-Known Member
Summit has hundreds..Derale,Flex a lite
and there are always older units at swap meets.
..think i'd go with a new one to be safe.
Mid seventies Mopars had nice factory units..try E bay.
and there are always older units at swap meets.
..think i'd go with a new one to be safe.
Mid seventies Mopars had nice factory units..try E bay.
Frank Mopar
Well-Known Member
Flex fans are noisy as hell, at least the ones I've seen. You will not be happy
furyus2
Well-Known Member
I have the Summit G4918 flex fan.6 blades. Stainless steel. Works better than a clutch fan. Not noisy at all. I would definitely use a shroud. Makes a huge difference.
mderoy340
Well-Known Member
I run a MP 5 blade viscous clutch fan with shroud. 180* thermostat, OEM 26" radiator, AC car in FL with no issues.
340dustr
Member
thanks for the info guys
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