Quote:
Originally Posted by s2man
I believe they blocked the grills on the late 80's cars.
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In the late 80/early 90's, car manufacturers were still concerned about getting good mpg, so with some models (Saturn, Civic) they eliminated the traditional grill openings above the bumper and retained only the grill openings below the bumper. As we went into the 90's, they stopped being concerned about mileage and went back to the traditional grill style.
The traditional style grill opening is the size optimum for the less efficient, low-pressure radiator/mechanical fan setups they had in the 20's and 30's (when a radiator overheating and boiling over was not unusual in very hot weather or when climbing a steep hill at low speed) so a lot of radiator area was desirable in that era. But modern cars with their more efficient, high-pressure radiator/fan setups require only a fraction of the traditional radiator area and opening.
It is interesting comparing the 92-95 Civic, which only had a below bumper grill opening and got mid 40's mpg, to the 96-99 Civic, which had a traditional radiator and got mid 30's mpg. Also compare the grill openings of the VW Jetta and Golf to that of the new Beetle, all 3 models of which have the same engine options. The Jetta/Golf have the traditional grill, whereas the Beetle, which is mimiking the appearance of the grill-less, air cooled "bug", has only a small grill opening below the bumper.
Another interesting variation of grill opening is that found on the 90's Camaro, whose radiator opening would be hard for the average person to locate. The opening is a thin slot on the upwind side of the air dam under the nose of the car.