I believe in a touring car, drawing air across the motor will be more effective than blowing. A touring car has a constant supply of fresh air entering the car, through the gaps around the shell, and through the chassis. sucking air across the motor will encourage the cool air through the car. Blowing air onto the motor, will have a negative effect, as it will have the natural airstream entering the car to fight against.
In a buggy, where the chassis is sealed close to the bodyshell, the I'd expect blowing to be more effective. inside a buggy shell, it is almost a sealed air space. With a fan inside the sealed space you are relying on the velocity of air to cool the motor down.
Just like putting a fan inside a sealed room at home. It wont cool the air in the room effectively at all, but the air temperature leaving the fan blade will be considerably cooler than the ambient temperature.
Just my ramblings. Not based on "fact" as such.
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˜”*°•. Chris Green •°*”˜
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