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Originally Posted by Steve C
Hi
Go as big as you can, remember the air flow is usually not as good in your car as it was in the donor car, also make sure the path for the air flow is well sealed so that all the cooling air gets forced through the radiator, try to look at other successful transplants.
Steve
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Good point. Engineering cooling systems is not simple, particularly when you are trying to put one into a vehicle that wasn't designed for it.
Since you can't depend upon the airflow being as good, you need to compensate by increasing the radiator size.
The general idea is that you want to take the air flowing past the car and slow it down on the inlet side of the radiator. This increases the pressure which causes the air to pass through the radiator. The ducting on the exhaust side of the radiator is also important. It should exit to an area of high speed airflow, which will have the lowest pressure. Above all, you have to prevent recirculation through the radiator. That means that the radiator has to be well sealed to the ductwork and the exit of the ductwork need to be well away from the inlet.
Don't depend upon electric fans to move the air. They are not made for continuous usage and you create another failure mode if you depend upon then. Fans should only come on when vehicle motion is insufficient to move air through the radiator.
George