Partial Grille Block
The front grille of a vehicle is used to direct air directly into the engine compartment. However, this redirects airflow from around the vehicle to through the vehicle, which increases drag. In order to reduce this impact a grille block is often used. A grille block covers up a portion, or all of the front grille of a vehicle. In most high efficiency models or vehicles with low drag coefficients there will be a very small grille already built into the design, therefore a grille block is unneeded. The grille in most production vehicles is built generally to have as much air flowing into the engine in order to keep it from overheating. But most commonly there is too much airflow into the engine, preventing it from warming up in a timely manner, so a grille block is used to increase engine performance and reduce the vehicles drag.
Read more about this topic: Automobile Drag Coefficient, Fabrication
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