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Old 08-20-2020, 06:19 PM   #1
mrtexas
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Default Cooling for 49 hot rod

Finally figured out how to install near stock crank driven 18 inch cooling fan for my 92 ford 302 in my 49 woodie.

Just got back from the radiator shop, had the water return pipe raised about an inch.

Moving the radiator 3 inches forward and raising the return pipe gives me just enough room to install an 18 inch heavy duty flex fan on the crank with a 2 inch spacer. The radiatior is 20 inches wide and the 18 inch fan will have 1 inch of room on all sides for the fan shroud I'm making. Don't believe the 16 inch electric fan I had installed would move this much air!

After this I'll have to modify the bumper sheet metal as well.
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File Type: jpg rad1.jpg (102.5 KB, 112 views)
File Type: jpg rad2.jpg (37.1 KB, 101 views)
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Old 08-21-2020, 02:42 AM   #2
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Default Re: Cooling for 49 hot rod

Everything depends on the geometry of the shroud and its relationship to the fan.
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Old 08-21-2020, 08:21 AM   #3
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Default Re: Cooling for 49 hot rod

Hope it all works out for you. Fill job on the original water neck looks a little rough for an expensive Walker. Can you make it look smoother with JB Weld or Bondo?
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Old 08-22-2020, 03:45 PM   #4
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Default Re: Cooling for 49 hot rod

Making progress on fan shroud.
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File Type: jpg rad3.jpg (47.7 KB, 54 views)
File Type: jpg rad4.jpg (75.7 KB, 42 views)
File Type: jpg rad5.jpg (61.4 KB, 51 views)
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Last edited by mrtexas; 08-23-2020 at 07:36 PM.
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Old 08-22-2020, 06:36 PM   #5
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Default Re: Cooling for 49 hot rod

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Originally Posted by 19Fordy View Post
Hope it all works out for you. Fill job on the original water neck looks a little rough for an expensive Walker. Can you make it look smoother with JB Weld or Bondo?
Fine Mexican craftsmanship, cost $45 to move. At least there still are radiator shops! Not too many brass radiators anymore.
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Old 08-27-2020, 06:40 PM   #6
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Default Re: Cooling for 49 hot rod

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Winding down the mods for real crank driven fan. Last is hacking away at the front bumper apron as I had to move the radiator 3 inches forward. Next is paint the brackets and apron. Will spray the apron but am thinking the 2 front fenders and hood have a shop spray it.
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Old 08-28-2020, 09:32 AM   #7
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Default Re: Cooling for 49 hot rod

Am I imagining it or does that flex fan have a CCW rotation?
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Old 08-28-2020, 10:15 AM   #8
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Default Re: Cooling for 49 hot rod

good catch- it is mounted backward.
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Old 08-28-2020, 11:21 AM   #9
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Default Re: Cooling for 49 hot rod

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good catch- it is mounted backward.
The flow of air remains the same on a fan mounted either way.
The one shown appears to be CCW specific.
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Old 08-28-2020, 12:08 PM   #10
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Default Re: Cooling for 49 hot rod

This Ford 302 is counter clockwise. I checked after the parts guy told me. Not as many fans available CCW!
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Old 08-28-2020, 12:42 PM   #11
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Default Re: Cooling for 49 hot rod

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This Ford 302 is counter clockwise. I checked after the parts guy told me. Not as many fans available CCW!
Yep, makes sense with a serpentine belt. (engine still runs CW)
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Old 08-28-2020, 01:09 PM   #12
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Default Re: Cooling for 49 hot rod

Look up Snow White water pumps, they make a shorter water pump for 289-302 Ford engines.
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Old 08-28-2020, 09:18 PM   #13
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Default Re: Cooling for 49 hot rod

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Originally Posted by 51 MERC-CT View Post
Yep, makes sense with a serpentine belt. (engine still runs CW)
Crank(engine) runs counter clockwise.
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Old 08-28-2020, 10:19 PM   #14
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Default Re: Cooling for 49 hot rod

I installed a 302 in my '41 Fordor with stock pump driven fan. no mods to the firewall and a Walker 4 core with Walker fan shroud. just raised the radiator 2" and fit perfectly. used a stock Ford 4 blade fan, cut about 3/4" off each blade tip to clear either a hose or crank pulley. ran 175 deg. maybe I'm missing something here!
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Old 08-29-2020, 04:45 AM   #15
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Default Re: Cooling for 49 hot rod

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Originally Posted by mrtexas View Post
Crank(engine) runs counter clockwise.
If you are running a CCW fan mounted on the water pump with a serpentine belt, the engine runs clockwise.
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Old 08-29-2020, 09:44 AM   #16
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Default Re: Cooling for 49 hot rod

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If you are running a CCW fan mounted on the water pump with a serpentine belt, the engine runs clockwise.
Crank mounted 302
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Old 08-29-2020, 12:36 PM   #17
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Default Re: Cooling for 49 hot rod

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Originally Posted by mrtexas View Post
Crank mounted 302
Are you saying that the fan is mounted on the crankshaft?
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Old 08-29-2020, 02:03 PM   #18
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Default Re: Cooling for 49 hot rod

yes
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Old 08-29-2020, 03:55 PM   #19
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Default Re: Cooling for 49 hot rod

.

Man, you're gonna have to convince me just a little bit more. If that "backwards-pitched" fan blade is attached directly to the crank, and that crankshaft rotates CCW as viewed from the front, what kind of transmission do you have that converts rotation back to NORMAL for the drive shaft and rear end? I can't think of ANY modern (or old) vehicle with an engine crankshaft rotating CCW as viewed from the front. Please prove me full of it! DD
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Old 08-29-2020, 10:23 PM   #20
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Default Re: Cooling for 49 hot rod

Quote:
Originally Posted by mrtexas View Post
Finally figured out how to install near stock crank driven 18 inch cooling fan for my 92 ford 302 in my 49 woodie.

Just got back from the radiator shop, had the water return pipe raised about an inch.

Moving the radiator 3 inches forward and raising the return pipe gives me just enough room to install an 18 inch heavy duty flex fan on the crank with a 2 inch spacer. The radiatior is 20 inches wide and the 18 inch fan will have 1 inch of room on all sides for the fan shroud I'm making. Don't believe the 16 inch electric fan I had installed would move this much air!

After this I'll have to modify the bumper sheet metal as well.

Why would you need to "raise the return pipe"?? Putting the fan down there on the crank snout moves it away from the upper hose, not closer!
However, the photos show the fan mounted in the usual location on the water pump shaft. The fan is obviously reverse rotation so won't work on the crank anyway. I'm missing something. What is going on here?
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