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VW engine will be the first 4-cylinder in the industry to use cylinder deactivation tech

With more stringent fuel economy standards looming in the U.S. and elsewhere, auto manufacturers are looking to pull out all the stops to improve economy as much as possible. Carmakers are turning to technology like direct injection and automatic start/stop. Several automakers are also using cylinder deactivation on their larger engines.

Cylinder deactivation is something that some carmakers in the U.S. and abroad have used for years. Chrysler has used the technology in its Hemi engines, Honda uses it on some of its V6 models, and Audi will use cylinder deactivation in its new line of “S” performance models.

VW is set to make a first in the automotive market by offering cylinder deactivation on its 4-cylinder models.

The VW tech will turn off two engine cylinders under certain conditions. The engine is called the 1.4L TSI and VW promises that it will offer a fuel savings of 0.4-liters/100km and when combined with start/stop technology the vehicle would save 0.6-liters of fuel. For those more familiar with U.S. mpg ratings, that works out to an improvement of in the range of 
3 to 4.5 mpg on average. 

The engine would turn off two of the cylinders under low to medium loads, and VW says that the tech will meet the future European EU6 emissions standards. The cylinders will be deactivated when the engine is operating between 1,400 and 4,000 rpm and the engine torque is in the range of 25 to 75Nm.

VW claims that operating range applies to about 70 percent of the driving distance in the EU fuel economy driving cycle. VW also points out that as soon as the driver presses the pedal the cylinders will reactivate without the driver being able to tell it happened. The cylinders also would not turn off if the vehicle were being driven in a sporty manner apparently. 

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RE: Good on paper..
By Manch on 9/7/2011 4:49:09 AM , Rating: 2
My girlfriend years back had an '88 Plymouth Sundance that got 40+ mpg, even with an intake manifold leak losing loads of vacuum..

umm...a leaking intake manifold would make fuel economy worse and that cars combined mpg for the time was only 25mpg. By todays standard that would probably be 21-22 if the car was in top shape.


RE: Good on paper..
By nocturne_81 on 9/7/2011 5:31:08 PM , Rating: 2
I may have exaggerated a bit, but it got at least somewhere in the upper 30s... Don't ask me how, but the lil car was a trooper... Bought for $350 with 90k miles, drove for 5 yrs, then sold it for $500 with 130k miles (sold it rather than fix it.. the buyer then drove it another 2 yrs with the manifold leak before selling it to someone else..). Could drive from here to cleveland (1 hr), then to columbus (2hrs), and then back home on a single tank of gas with a bit to spare. In our harsh NE Ohio winters, it never got stuck -- never. Seemed like it was so light it just floated on top of the snow, where I'd get stuck pulling out right after..

That was then, though.. I could never in good conscience recommend a Chrysler now. It's like Chevy's switch from the cavalier to the cobalt. Shoddy as the cavalier was, any that ever drove both can certainly admit that the cobalt drives like a tin can on wheels.

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