with a cowl hood on my car, and the proper sized hole cut under the cowl..will this help keep the engine cooler in anyway?

how big should the hole be cut under the cowl?

 

IHAM,

It probably would help cool the engine compartment a little, but might also cause a slightly higher pressure in the engine compartment, impeding the flow of air through the radiator.

A better way of forcing more air through the engine compartment might be to increase the size of the front air dam. This creates a slight increase in pressure in front of the radiator, and a slight vacuum behind the radiator support and under the car. Ram air will be more likely to flow through the radiator and engine compartment, changing air faster and taking the heat with it more effectively.

Another benefit of this is to keep turbulent air from under the car, and the slight vacuum created will tend to hold the car to the road better at higher speeds (90+). This is most effective when combined with lowered side air skirts to complete the package.

On the negative side, the larger air dam creates more frontal area and can cost you a little top end, and can also cause more scrubbing at those high approaches to driveways.

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Later,
Vader
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