Green Car Congress  
Go to GCC Discussions forum About GCC Contact  RSS Subscribe Twitter headlines

« Making driving less energy-intensive than flying | Main | DLR researchers visualize blade tip vortices from in-flight helicopter in three dimensions »

Print this post

Mazda delaying SKYACTIV-D diesel launch in North America; further tuning of fuel economy and performance required

9 January 2014

Mazda North American Operations is delaying the introduction of its SKYACTIV-D diesel engine (earlier post) in North America from the original targeted Spring 2014. Mazda said that the although the SKYACTIV-D can meet emission regulation requirements without the use of a NOx after-treatment system, it decided that further development is required to deliver the right balance between fuel economy and “Mazda-appropriate” driving performance.

Further information on the program, including a timeline of launch for North America, technical specifications and fuel economy will be available at a later date, closer to launch.

As described in 2011, the 2.2L SKYACTIV-D engine would reduce fuel consumption compared to the current 2.2L MZR-CD diesel by 20% due to a low 14:1 compression ratio and subsequently greater expansion phase after combustion.

The low compression ratio decreases compression temperature and pressure at TDC; consequently, ignition takes longer even when fuel is injected near TDC, enabling a better mixture of air and fuel. The formation of NOx and soot is alleviated since combustion becomes more uniform without localized high-temperature areas and oxygen insufficiencies. Furthermore, injection and combustion close to TDC make a diesel engine highly efficient.

January 9, 2014 in Brief | Permalink | Comments (1) | TrackBack (0)

TrackBack

TrackBack URL for this entry:
http://www.typepad.com/services/trackback/6a00d8341c4fbe53ef019b047edb6d970d

Listed below are links to weblogs that reference Mazda delaying SKYACTIV-D diesel launch in North America; further tuning of fuel economy and performance required:

Comments

1. The time for debuting the Mazda6 diesel was the second half of 2013. As reported here by USA Today in Sept 2013, the introduction of Mazda6 diesel was delayed to late spring of 2014. [http://www.usatoday.com/story/money/cars/2013/09/12/mazda-delay-diesel-mazda6-late-spring/2807063/]

2. May be Mazda will realize, like some other Japanese automakers, that it is almost impossible to meet the demand of U.S. emission requirement without urea treatment or other catalyst.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Green Car Congress © 2013 BioAge Group, LLC. All Rights Reserved. | Home | BioAge Group