Originally Posted by
DrDirt
OK, to help visualize....think of the air molecules as a length of anchor chain. Now, visualize a a thruhull (hole) at the bow of your boat. Your task is to get that length of chain through the hole and into the water. Which is going to work better, dropping the anchor and letting it pull the chain through? Or maybe it would be more efficient if you picked up the last link in the chain and tried to push the chain through the hole. Whacha tink, Mon?
Same thing with the air through a radiator...ot trying to herd a chicken.
not really the same. An electric fan has a shroud around it. a pusher will pressureize the area between the fan blades and the front of the radiator. this forces the air through the fins. since it has a shroud the air has no where to go except through the radiator.
with a puler it works in reverse. it creates a vcacuum between the blades and the radiator drawing air through the radiator.
if you run a pusher fan you need to make sure that the fan is reversible (if you use a puller the blade design might be very inefficent when used as a pusher and vice versa) or get a fan that was designed as a pusher.
im using both on my car. im using a 20" electric puller off a crown vic along with a small 10" pusher off a toyota