clutch drive fans

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earthmover

earthmover

in the tire smoke
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i was looking over some of my old mopar muscle books that said they created up to 15hp at the rear with a thermostatic visous drive fan....has anybody tested that??????i still plan to go electric with water pump drive but man i should have got 1 of those yrs ago....my fan is jsut bolted to the water pump....was just wondering about if it really made that much diff...
 
I read that too, but I'll keep my feather lite flex fan thats rated to 8000rpm over that boat anchor thermo fan that when it go's bad destroys everything around it...
 
A fan will not add HP. What they are saying is that a clutch fan can free up 15hp vs a normal fan.

If your car is a street car you should not use an electric water pump drive.

For example…. Take a 360 that makes 300hp without a fan at the rear wheels.

Put on a normal fan and test it again…. It will now be making less than 300 at the wheels (a loss of whatever it takes to drive the fan)…….

Now put on a clutch fan and test it again…. The engine will still be making under 300 at the wheels but the loss will be less than a standard fan.


What will never happen is a gain of 15hp……..


For example…

You test a 360 without a fan and it makes 300hp at the wheels……. Now you put on a clutch fan and test it again……

The power will be less not more than 300.
 
i get what your saying but as said mopar muscle says that up to 15 hp at the rear . i dont think its that much but i think that it suppose to be some....and as a side note once at the track my belt came off in the burnout box and i didnt know the car went just a little faster mph and et no very much but did...now the fan is suppose to only work at its full pot. at a set temp. and to a base rmp so id say you should gain something along the way...as fro as thw water pump drive on a street car you know what they say street car is used loosely..i drive my car maybe 10 miles every 2 mouths....but even when i drive it and go off and kill it a few times it never get over 180 even with back to back runs at the track with no cool down time between.....
 
I get what you are saying. I think 15hp at the wheels is a bit much too.

On the electric water pump drive thing…. Nothing wrong with light street use on a mostly track car. I just don't get the guys that try to run one full time on a normal street car.
 
I would call that BS. There is power to be freed up there. And that's what it's doing. Any HP not used in turning the engine is your crank output. In this case, parasitic loss from the powertrain is a constant. So it doesnt really matter crank vs wheel hp. When you reduce loss from accessories that increase will be noticed on the dyno. Fans could use 15hp... Waterpumps do, P/S pumps REALLY do, fuel pumps take a couple hp. But for a fan to use "zero" or at least the minimal parasitic draw you need an electric one. Otherwise you are still turning it one way or another. Removing it would gain 15hp I think. But not replacing a solid with a clutch of any type. I'll never use a flex fan. Regardless of rating they DO come apart and I've seen several over the years... Blades go up thru the hood, the radiator, fenders... no way. not on anything I build.
 
yea i agree you make more power without the fan the car craft book did a test that showed power at diff. rpm and it ended with i think was 8 at the rear wheels thats on a race mustang..but i think it depends on the app.i hope that its 15 at the rear i can use it.hahahaha.and mopar did the page on the ther. controled fan that said up to 15 with the fan not on the soild mount fan ..but as said i hope that its 15 + some with the water pump..
 
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