Belt Driven Fan HP and MPG Penalty
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Senior Member
Joined: Jul 1999
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From: Oklahoma City
Belt Driven Fan HP and MPG Penalty
How much MPG / HP are we loosing due to the belt driven fan?
I am considering replacing with an electric fan if the MPG savings and HP gain would be substantial enough.
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Truck Pictures
99 XLT 5.4L Regular Cab 4x2 120" Wheelbase 4 wheel disc brakes/ABS 5 star larait style wheels Toreador Red/Silver 3.55 gears 255/70/16 OWL Delta toolbox, Ford Running Boards, Ventshades, Bugflector, Bullrings, Donnelly compass mirror, 2" Rear drop.
Eclipse 5340 cd player
Memphis ARCS50 component speakers w/tweeters mounted flush in the door panels (excellent sound)powered by a Sherwood 35x2 RMS amp
Kicker ZR360 for the 2 Audiobahn AWC10 subs
regcab54@sc.rr.com
I am considering replacing with an electric fan if the MPG savings and HP gain would be substantial enough.
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Truck Pictures
99 XLT 5.4L Regular Cab 4x2 120" Wheelbase 4 wheel disc brakes/ABS 5 star larait style wheels Toreador Red/Silver 3.55 gears 255/70/16 OWL Delta toolbox, Ford Running Boards, Ventshades, Bugflector, Bullrings, Donnelly compass mirror, 2" Rear drop.
Eclipse 5340 cd player
Memphis ARCS50 component speakers w/tweeters mounted flush in the door panels (excellent sound)powered by a Sherwood 35x2 RMS amp
Kicker ZR360 for the 2 Audiobahn AWC10 subs
regcab54@sc.rr.com
Senior Member
Joined: Oct 1999
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From: Trixters-Playground
I would estimate you can gain about 20hp. This equates to better mileage.
It is definitely worth it, IF you get a good quality fan. I would suggest a temperature switch, A/C switch, and a manual override.
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'98 4.6 5-sp F-150
We've come for your Tundra.
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It is definitely worth it, IF you get a good quality fan. I would suggest a temperature switch, A/C switch, and a manual override.
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'98 4.6 5-sp F-150
We've come for your Tundra.
Where we started.
After a facelift.
A 2" drop!
F-150online Photo Album
trixters-playground@excite.com
Truckin' Magazine!
Senior Member
Joined: Feb 2000
Posts: 1,544
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From: Kalamazoo, MI, USA
Industry experts peg it at between 12 and 18 HP -- with light duty (air conditioning only) running around 3 HP.
Remember, if it really takes 18 HP to cool your engine -- it hardly matters whether it comes instantly in the form of the mechanical fan -- or over time from the electric fan -- cooling HP is cooling HP -- and it ALL comes from the engine (ya gotta get that battery charged somewhere).
You obvously are not going to get 18 HP from an electric fan -- so, there must be something that the cooling experts aren't telling us.
The engines will run very well at temps of near 250 Degrees -- in fact, the hotter the better -- but what is that to mean to everything else in the engine compartment? It will be a virtual oven, slowly baking every man-made item until they'll be virtual bakelite -- and probably will shatter just as easily.
What will 250 Degree temperatures do for your other water-cooled devices -- remember the marvelous article by the Ford Trans engineer -- anything over 180 Deg F. is bad bad bad.
Add a supercharger inter-cooler to the mix, 5w30 oils, and boy, are we gonna be a the ragged edge.
Read the SAE Journals -- we're going to have glass engines before long (well, not exactly, but pretty close) just to take the heat and be hard enough to withstand some friction.
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Y2K™
XLT SC SB 5.4L 3.73LS
Remember, if it really takes 18 HP to cool your engine -- it hardly matters whether it comes instantly in the form of the mechanical fan -- or over time from the electric fan -- cooling HP is cooling HP -- and it ALL comes from the engine (ya gotta get that battery charged somewhere).
You obvously are not going to get 18 HP from an electric fan -- so, there must be something that the cooling experts aren't telling us.
The engines will run very well at temps of near 250 Degrees -- in fact, the hotter the better -- but what is that to mean to everything else in the engine compartment? It will be a virtual oven, slowly baking every man-made item until they'll be virtual bakelite -- and probably will shatter just as easily.
What will 250 Degree temperatures do for your other water-cooled devices -- remember the marvelous article by the Ford Trans engineer -- anything over 180 Deg F. is bad bad bad.
Add a supercharger inter-cooler to the mix, 5w30 oils, and boy, are we gonna be a the ragged edge.
Read the SAE Journals -- we're going to have glass engines before long (well, not exactly, but pretty close) just to take the heat and be hard enough to withstand some friction.
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Y2K™
XLT SC SB 5.4L 3.73LS
Thread Starter
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Senior Member
Joined: Jul 1999
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From: Oklahoma City
The electric fan saves HP when it's NOT running.
Cooling by a fan is only needed a very small amount of time in normal driving.
With a regular fan you are paying the penalty wether your engine needs cooling or not.
Cooling by a fan is only needed a very small amount of time in normal driving.
With a regular fan you are paying the penalty wether your engine needs cooling or not.
