Print 62 comment(s) - last by meef.. on Sep 10 at 5:31 AM

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 nocturne_81 on 9/6/2011 6:41:22 PM , Rating: 2
I guess I should have said 'not much' instead of 'no'... And the quip about rpm's was more or less meant as a statement that while driving normally, 1400-4000 is the entire range of 'cruise' driving.

Personally, I drive an old Buick LeSabre with a v6 3800 block as my daily driver, and an '82 Trans Am with an emissions-free 383 stroker v8 -- so I obviously don't care much about efficiency while driving.

To those that do indeed care, though.. Why are compact cars marketed as more sporty than efficient? Why not put your money where your mouth is and drive a teeny little 'smart' car with horrible performance?

I'm just trying to make a simple observation that it is incredibly possible to create a small 3-4 cylinder diesel engine vehicle that can achieve over 70+ mpg and satisfy the needs of most drivers -- it's just nobody would want to drive it..

RE: Good on paper..
By Johnmcl7 on 9/6/2011 7:23:12 PM , Rating: 2
It's not just possible, those engines exist over here as an option for plenty of small cars. However diesel engines don't tend to work so well in small capacities and the additional cost against money saved in fuel effiency doesn't tend to be very good for small cars with small economic petrol engines. They certainly do not satisfy the needs of most drivers, like the small Smart car engines they're ok for driving within in a city but hopeless outwith as their 15+ seconds to 60 makes them painfully slow and they struggle to keep up with other traffic.

In the UK because the tax on fuel is very high and the road tax is based on emissions (which generally favours fuel efficient cars) most cars are chosen on their fuel effiency.

RE: Good on paper..
By Shining Arcanine on 9/7/2011 12:46:54 AM , Rating: 2
People keep saying that, but I do not think that they realize that the gallons in the UK are bigger than the ones in the US. When people in the US talk about 70mpg cars, they are talking what would be 84mpg cars in the UK, which I do not believe exist anywhere right now.

RE: Good on paper..
By Keeir on 9/7/2011 6:35:51 PM , Rating: 2
Its also important to note the different Fuel Efficieny Measurements.

Based on Toyota and VW comparison points,

A 70 US EPA rating = 95-100 UK EU Rating

RE: Good on paper..
By Jeffk464 on 9/7/2011 7:10:42 PM , Rating: 2
You also don't worry about driving decent cars it seems.

"I modded down, down, down, and the flames went higher." -- Sven Olsen

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