My fan runs at 1940 rpm but even so it should not make a difference...push or pull...with the same air temps going across the fins. If it did, I think GM would have fixed that a looooooong time ago on cars
Well cars it's a different matter. On a front mounted engine, 10 times out of 10, the radiator is up front because it makes sense. On top of shorter coolant travel, when the car's moving, it's pushing air against the radiator. Having a fan in a push configuration doesn't make sense because:
- If it was pushing from the inside out, it would be blowing air against the air coming against the car as it's moving.
- If it was pushing from the outside in, this presents two problems
- The fan is now a hazard because now you need to protect it against someone stupid enough or kids that may want to put their hand past the front grille.
- The radiator basically acts like a barrier/filter against things like bugs, rocks, debris, etc.
Having it in a pull configuration on the inside works because now you're going with airflow, the air you wanted to use to cool the radiator has already passed through it, the radiator acts like a basic filter against coarse objects, and it can still create airflow when the car is stopped.
On a rear engine car... well now you have other issues to deal with.