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post #1 of 5 (permalink) Old 11-21-2005, 12:36 PM Thread Starter
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CFM Rating 4.6L Fan?

Does anyone know the high and low speed cfm rating of a stock 4.6L MN12 cooling fan?

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
76 Glastron Carlson 23' Jet Boat w/460 CJ Engine
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post #2 of 5 (permalink) Old 11-21-2005, 01:51 PM
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I can't find exact specs on high and low cfm. But someone wrote the range is 2400-2800.

If you know the Amps they draw at each speed, the SPAL fan rates 90 to 110 cfm per amp.
AMPs X 90 = CFM
(AMPs x 110 = CFM)

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post #3 of 5 (permalink) Old 11-22-2005, 04:41 PM
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Not sure why you asked, but most aftermarket ones can't compare to the OE. I tried a dual fan setup that supposedly pulled 2500 and it overheated any time I used the AC in weather above 60 deg.


SOLD!!!!

5.4 block from 99 expedition bored .20 over
Forged crank/Manley Rods/JE flat tops/chromemoly rings and Steeda Underdrives
P&P PI heads (by me) w/ 3 angle valve job w/copper gaskets with ARP studs/bolts and One piece lightning cams
80mm Pro-M MAF and Cut & welded '95 4.6 intake
Jmodded Trans & Trac-loc pumpkin (Cobra) 3.27
Raxles, ADDCO 1 1/4", Eibachs, JL Braces
18" CEC type 169 wheels w/ 245/40 front 255/45 rear
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post #4 of 5 (permalink) Old 11-22-2005, 08:53 PM Thread Starter
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It's for my truck. I'm running a pair of 14" fans that pull 2950 cfm each. During the summer (90 deg and higher) it runs hot while cruising. Pull off to the side, and the fans pull it right down, so obviously the fans aren't an issue.... But I'll have a spare 4.6L fan/shroud available soon and if it was more than the 5900 cfm, I would just use it.

But it looks like the Mark VIII one (4000 to 5000 cfm) isn't even equal to what I'm running. So I guess I'll have to break down and buy an aluminum 2 core radiator to replace the Continental 3 core copper radiator I'm using.

Thanks for the info.

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
76 Glastron Carlson 23' Jet Boat w/460 CJ Engine
94 Daily Driven 4.6L is offline  
post #5 of 5 (permalink) Old 11-23-2005, 08:24 AM
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The big thing to look at is full coverage of the radiator. You want your fan/shroud to cover the whole thing. if say 15% isn't covered, you'll lose a lot of cooling.


SOLD!!!!

5.4 block from 99 expedition bored .20 over
Forged crank/Manley Rods/JE flat tops/chromemoly rings and Steeda Underdrives
P&P PI heads (by me) w/ 3 angle valve job w/copper gaskets with ARP studs/bolts and One piece lightning cams
80mm Pro-M MAF and Cut & welded '95 4.6 intake
Jmodded Trans & Trac-loc pumpkin (Cobra) 3.27
Raxles, ADDCO 1 1/4", Eibachs, JL Braces
18" CEC type 169 wheels w/ 245/40 front 255/45 rear
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