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Old 03-19-2013, 08:28 PM
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Space Needed for Mechanical Fan with Clutch

I'm finally getting around to figuring out my cooling fan for my hotrod (a 1940 Chevy Coupe). With a 383 and A/C, I figured it best to go with a mechanical fan with a clutch. I'm just not sure it will fit. Seems like a lot of folks go with an electric fan due to space limitations. How much space do I need between the water pump pulley and the radiator? I have 3.75 to 4 inches. If it will fit, any recommendations for a good fan and clutch setup? Thanks!

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Old 03-20-2013, 12:34 AM
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Richland here. I don't know the dimensions of fan/clutch setups, but any particular reason for not using electrics? SPAL makes a relatively slim line dual fan system with built in shroud.
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Old 03-20-2013, 04:47 AM
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The ford electric fan is very good. Can be had for cheap ($25.00) at your local auto salvage yard. Has a built in shroud and is a 2 speed fan. Low speed is enough is most cases. High speed pulls around 40 amps and 4500 cfms. Low speed is less than 20 amps. The fan comes from mid 90's t-birds and taurus. Don't connect both power wires up at the same time (low and high speed wires). And replacement motors are sold at autozone.

The biggest issues will be getting a big enough relay and a T-stat to control the fan relay.

I like mechanical fans the best, but fitting a shroud in a hot rod can be tricky. I don't think 4 inches is enough room.
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Old 03-20-2013, 09:13 AM
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For the fun of it I tried measuring the fan clutch on my 95 chevy pickup and from the face of the water pump pulley to the front of the clutch housing was between 3 1/2 and 3 3/4 inches { with the shroud its hard to get an exact number to the fraction }. Then from the front of the clutch to the rad was around 4 inches. The fan blades on the chevy unit are set back some from the front of the clutch fins but its the maximum length of the unit that counts. I'm not sure if there is a clutch out there that has a more stubby setup. I suppose you could look at flex fans as they should take up less room but I can't say I am personally thrilled with them ... they have there place though but would have to make sure it was one that could handle the revs and not come flying apart.

I can see a few reasons why the electric fan would be better, no danger of flinging out a fan blade under high RPM, a slim design to fit in a smaller space, and not sucking the HP when winding the engine out. You would just have to make sure your alternator put out half decent power to keep the system charging and voltage up to not take away from the ignition system, same for the battery.
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Old 03-23-2013, 11:09 AM
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Thanks for the input guys. I'm just a bit worried about overheating, and want to try and build a reliable car that I can enjoy driving and not worrying about the temp. I live in a desert out in eastern WA and it often gets well over 100 degrees in the summer. Sounds like it is going to be nip and tuck as to whether a mechanical clutch fan will fit, but the Ford fans from the 90's sound like a good option if I can't fit a mechanical.
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Old 03-23-2013, 11:48 AM
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40 chevy: There's a lot of room in the engine compartment depending on how you installed the engine & rad? the only way we could even guess is to see pics of your installation? Seems like I would get a tape measure first measure the clutch fan and measure the room between your water pump pulley and the rad???? Instead of being on line wanting us to do it for you????

If your handicapped I'm sorry my apologies But if one of us was there with you we would grab a tape and measure! When building and changing things when car modifying everyone you look at is different !! Long or short water pumps different radiators different mounts ETC. Post some good pics and we could tell you what we think instead of guessing!!

The amount of cooling area in the radiator and the shroud are more important to cooling then which fan you run! Electric or clutch or a plain Jane fan? Your not worried about HP or you wouldn't be running air! So a fan with a clutch or a regular fan doesn't make any real difference! Some junk yard electric fans have a resistor wired in, if they dont cool enough I by pass or remove the resistor giving the fan more RPM.

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Old 03-23-2013, 12:04 PM
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No I'm not handicapped, I just don't ave a clutch fan available to measure and I wasn't sure how "thick" they are or if there are different ones out there that measure differently. Thought that somebody else may have been down this road before. I'm surprised that you would take the time to provide the response that you did - but I guess everyone is different. Thanks again to the other folks who responded - good info...
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Old 03-23-2013, 02:10 PM
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Quote:
Originally Posted by 40taylor View Post
No I'm not handicapped, I just don't ave a clutch fan available to measure and I wasn't sure how "thick" they are or if there are different ones out there that measure differently. Thought that somebody else may have been down this road before. I'm surprised that you would take the time to provide the response that you did - but I guess everyone is different. Thanks again to the other folks who responded - good info...
You can measure at junk yards to see the different types and what would work but a normal fan would work fine the clutch fan is quieter at speed and saves eng torque But your running air and probably power steering so that gain is negated! You need enough room for the clutch and fan plus the forward motion of the fans flex when at RPM If your running a shroud you don't need to worry so much about positioning the blades close enough to the radiator to pull air through it and not around it! Most part stores will let you measure a clutch to see if it will work if they think you'll purchase one! My post wasn't meant to offend! BAD humor at your expense, sorry!!!

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Old 03-24-2013, 05:40 AM
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http://www.haydenauto.com/upload/Hay...n-clutches.pdf
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