With this specific fan, it is set up as a reversable orientation. So, it can be either a pusher OR a puller. It just depends on the way you hook up the wires and which side of the radiator you mount it.

 

I am running a 16" puller fan on the back of the radiator and a smaller 9" pusher fan on the '65 falcon.....need the extra cfm (2200) because of the aluminum heads

 

Ahhh, but if you have an area between your fan blades and the radiator that is pressurized, that means you have all those nice cool air molecules stacking up at the fins waiting their turn to go through. Additional cool air outside the fan will not jump into the fray because it is high pressure there. Why should they go there when it is easier to avoid all that high pressure nonsense and take the easy way and go around? The molecules in the pressureized zone are trying just as hard to go back through the fan blades the way they came in as they are trying to get through the radiator fins...that's why it is called pressure.

 

Too technical Dr. Dirt. I just need to know which one is better here in Florida. i.e. Which way will cool the best.

 

same thing will happen if you have a vacuum. the high pressure behind the fan will try to force air back through the blades while you are waiting for air to be drawn through.

that why super chargers work much better when placed before the cylinders, and not after

 

i vote puller BUT, if you can have both i dont see why that wont be a better deal. then y ou will have the best of both worlds. but with a pusher, after that air get's threw it dont really have any more power to move any farther. with a puller after sucking the air threw the radiator the air still has to go past the fan thust blowing it on the motor. now it wont make that much of a difference and the air might be a bit hot by then but im sure it's something that help's. even if it is only a small fraction of a difference.

 

But, dontcha see, it is way easier to pressurize the area between the fan and the radiator than it is to pressurize the area between the fan and the engine compartment.

Basically, I'm just messing with you. Either pusher or puller will work so long as you get enough flow. Sooo, pick your favorite poison. Personally, I like the puller.

 

I used a pusher on my 93 and sitting in traffic on a cool day the temps never got over 170-175 and on hot days it wouldn't get over 180-182. I got use to watching my gauges cause with the stock fan I couldn't go through a mickey dees line without temps raising upwards 210+

 

i have the stock fan, but an electric waterpump, but i would think puller seems more efficient. just my .2

 

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