Shutter Grille on Chevy Cruze Eco Options

[RockyMountainCel...]

all for 0.5MPG :?

http://www.autoblog.com/2010/08/11/explode...shutter-grille/

Autoblog.com

While we'd all love to see 1,000-horsepower supercars that effortlessly reach 100 miles per gallon, the pace of fuel economy improvement is far less aggressive. Automakers are scratching and clawing for every mpg they can find by doing things like downsizing and turbocharging engines, adding direct injection and variable valve timing, utilizing electric power steering and cutting weight. Another great way to save fuel is through improved aerodynamics, as evidenced by an enhancement made to the 2011 Chevrolet Cruze Eco that helps the new C-segment sedan reach 40 mpg on the highway.

The Eco Cruze utilizes an innovative automatic air shutter system that closes the grill vents at higher speeds to reduce drag by .016 – adding .5 mpg and helping push the Cruze to the magic 40 mpg number. The shutter system is fitted to sensors that measure changes in speed or temperature. If the temperature drops or the sensors measure sufficiently high speeds, the vents will be closed by electric motors, cutting down the amount of air that enters the engine bay. Why not simply keep the grill vents closed all the time? Because added airflow is needed to help cool the engine at lower speeds. Follow the jump to read the General Motors presser and watch a minute-long video that shows how the shutter system works.

[saleeka]

Zenki AE86 Corolla Levin GT-Apex models had a similar grill setup.


The center piece would not rotate open until the car reached a certain operating temp to help improve drag.


The setup was linked to the radiator, as shown by the right hand side of the diagram below:


Not bad for 1983