Radiator Fan Placement

[Wynand]

Where is it best to mount the radiator fan; in front of the radiator (blowing through) or behind (sucking through). And why would you say so?

Take note that an air intercooler will also be fitted in front of the radiator. Will this effect the placement of fan or is it better to fit radiator in front of the intercooler?

[flyerncle]

Fans are available to fix to the face of it with plastic pins that go through the core fins and for my two pennies worth I would use one that sucks through as pushing air forward defeats the object of cooling.

[cornishmaid]

Originally Posted by flyerncle

Rads are available to fix to the face of it with plastic pins that go through the core fins and for my two pennies worth I would use one that sucks through as pushing air forward defeats the object of cooling.

Fair point but sometimes space is a premium factor on what type of fan to use?

[flyerncle]

Point taken, Pacet do a good range.

As posted previously the rad fitted to the race car being built is fitted inside the front chassis behind the rack and no fan is fitted as it will never sit in traffic,it was custom made and about £300 .

[tex]

put it behind the rad and make sure it sucks the air
if its in front it will cover off the area to wind cool by the area of the fan itself!

behind is best - (apparently )

[Wynand]

Originally Posted by tex

put it behind the rad and make sure it sucks the air
if its in front it will cover off the area to wind cool by the area of the fan itself!

behind is best - (apparently )

Make sense Tex when the fan is not powered whilst at speed, the wind will cause the fan to turn and in effect become a "disc" causing drag and slows down the air flowing through the radiator....

Any other suggestions?

BTW, the fan I have is one of those flat black universal plastic ones sold at most auto spares outlets.

[davidimurray]

Originally Posted by tex

put it behind the rad and make sure it sucks the air
if its in front it will cover off the area to wind cool by the area of the fan itself!

behind is best - (apparently )

But if you have the fan tight behind the rad it will also block the airflow. Best option is to mount the fan a distance away from the rad - mine is about 3" behind the fan in a custom made cowl.