CornerCarvin67
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- Dec 30, 2004
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70_Nitrous_Eater said:I wanted to address 2 things.
By design.. a pusher or puller fan will move the same amount of air and will have exact same efficiency's.
70_Nitrous_Eater said:Think about this guys... every fan is a pusher AND a puller. Only difference is what side of the fan the motor and shroud is on and thus what side of the radiator the fan is mounted on.
So why do most automotive manufacturers use a puller fan? Well 1st off, not all do. But the main reason is because if it's in the engine compartment, the fan is more protected. Both from weather, but also from debris.
70_Nitrous_Eater said:2nd. Engine temperature is controlled by your thermostat. NOT your fan or radiator. The only time your engine temp will fluctuate with an electric fan is if your cooling system is inadequate and the temperature inside the radiator starts to climb above the temperature in which your thermostat is designed to open. If this occurs, then your cooling system is inadequate.
70XR7ConvertCat said:Sort of. If the car is moving forward a puller is more efficient, because it's assisting, rather than pushing against the airflow coming in through the grill. Although this would be tougher to measure, I'd hazard to guess it is more efficient even if the car were moving backward. The air in the engine compartment in most likely hotter than the air surrounding the car. So, a puller would be drawing in cooler air. Cooler air equals more heat transfer which is what you want.
Protected from what? If the fan is pushing debris from the engine compartment into the radiator, I'd be the first to ask why. If so, a fan shroud could help here and also increase efficiency by helping to direct the air flow.
All things being equal, yes. A manufacturer designs an engine to run at thermostat temperature. I've heard discussion on this site the reason a car overheats is the coolant doesn't stay in the radiator long enough to cool. It's a strange way of making the argument of inadequate heat transfer. An electric fan doesn't make up for an inadequate cooling system, but it helps to transfer heat. I've never heard the dual Spal fans on my '67 come on while I'm in motion, but certainly at idle.
Don't forget if you ever find yourself running hot for whatever reason, turn on the heater (extra heat transfer) as a temporary measure.
Steve C.
70_Nitrous_Eater said:Hold on here... doesn't matter if you have a pusher or puller fan. Air flow is always in the same direction. Trying to reverse the airflow is a really bad idea for the exact reason you mentioned. I think your getting confused here. Pusher or puller means wether the fan is designed to push or pull the air through the radiator. It has nothing to do with the actual direction of airflow.
70_Nitrous_Eater said:A fan is part of a cooling system. And more airflow (as a result of moving to a high flow electric fan for example) will definately improve cooling. The arguement about the amount of time the coolent spends in the radiator is completely wrong and I really hope you don't believe it. I can go into detail on why if you want.
CornerCarvin67 said:I brought this thread back from the dead with a simple question guys.... What size electric fan will fit a stock sized radiator on my 67, 289 car? You guys are great in debating all this technical stuff.... how about the simple stuff?
CornerCarvin67 said:I brought this thread back from the dead with a simple question guys.... What size electric fan will fit a stock sized radiator on my 67, 289 car? You guys are great in debating all this technical stuff.... how about the simple stuff?