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Index > Engine/Drivetrain > Thread: Relacing broken electric cooling fan with flex fan
Thread: Relacing broken electric cooling fan with flex fan
jeremiah


Revvin Up
Posts: 56
posted April 02, 2010 04:48 PM

Relacing broken electric cooling fan with flex fan

So my 1974 REPU had an electric cooling fan when I got it, its a broken down small unit mis-secured with zip ties out of some donar car I can't place my finger on. I painted the truck and now am working on the engine bay. I found an original fan shroud and want to run a flex fan with it. Well my problem is that I cant find one that the mounting holes will line up with on the water pump. I was curious if you all might have some ideas besides re-drilling the mount holes. Thanks in advance for any help, Jeremiah

       
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EricRyan


Revvin Up
Posts: 61
posted April 02, 2010 08:15 PM

Please go back with a stock clutch fan.

You shouldn't drill holes to make this flex fan fit either, it will never center up right, ever. And that microscopic amount of being out of balance will wear your water pump & bearing out pre-maturely.

       
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sparky


Redlining
Posts: 299
posted April 03, 2010 07:32 AM

Eric is correct. I would stay with electric cooling. I will be going electric soon. The less stuff you have running on belts on the engine the better. It's all rotating mass that slows the engines ability to accelerate.

       
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EricRyan


Revvin Up
Posts: 61
posted April 04, 2010 08:07 AM

But electric isn't perfect, either. Sure it might save you half of a usable horsepower, but can fail at any time, without warning. I like knowing that my clutch fan is doing it's job all the time.

       
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jeremiah


Revvin Up
Posts: 56
posted April 04, 2010 04:19 PM

I think you all might have misunderstood what I was asking. I do not have a stock clutch fan, only a crappy electric one. I do not want an electric fan. If anyone on here knows what type of mechanical fan would work, or if they have one, they are urged to let me know. Thanks again, Jeremiah

       
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sparky


Redlining
Posts: 299
posted April 04, 2010 04:37 PM

go with the stock clutch style. Any 1st gen rx7 will work.
____________
'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition

       
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Klaus45


Redlining
On two wheels
Posts: 218
posted April 04, 2010 05:33 PM
Edited By: Klaus45 on 4 Apr 2010 17:34

quote:
go with the stock clutch style. Any 1st gen rx7 will work.


...or one from an rx-4, or rx-5 cosmo...

I probably have an extra of some workable variety.

       
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Brad


Rotorhead
Posts: 1672
posted April 05, 2010 09:03 AM

When the thermostat for the electric fans fail they typically stay ON. If wiring breaks to the electric fan it'll definately go off. If you wire it right that won't happen.

The fan itself can fail internally, but so can a mechanical waterpump driven clutch fan. I've had 2 mazda rotary mechanical fans fail. One started to freewheel and did less cooling. The other the clutch tightened up and it ran more.

Stock fans make a ton of noise which is the main reason I went to an electric fan. I couldn't get my e fan to fit in the stock shroud so just made my own. You don't need a shroud either if part of your e-fan covers the oil cooler too.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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midnightriders


1st Gear
Posts: 16
posted April 20, 2010 09:26 PM

do not use a flex fan for fair warning, a rotary revs to 7k+ and we all know we do it, and a typical flex fan is rated for v8 rpms (5500 at best) trust me, one on my 85 gsl-se. the guy before me thought it would help the cooling issue, and instead at a 6000 pull the rivets let go and luckly only distroyed the raiator, coulda been worse
____________
'74 white RePu
rb26 awd 240sx (yea i know)

       
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