Those same high compression ratios also contribute to higher combustion temperatures which causes more NOx production in the exhaust gases, the big bugaboo for diesel emissions.
For this new engine, Mazda has reduced the compression ratio to just 14:1 (compared to as much as 20:1 in traditional diesels) thus allowing for lighter internal components and lower combustion temperatures. As a result, Mazda claims they can meet exceptionally tough US emissions standards without resorting to a urea-injection system that converts NOx to nitrogen and water. Thus the overall cost of using a diesel is significantly reduced.
Volkswagen is having great success with diesels in the Passat, Jetta and Golf andis launching a diesel Cruze soon. It will be interesting to have another diesel option in the hotly contested midsize segment.
2014 Mazda6 First Drive – Motor Trend
The toughest gig in town? If you’re a mainstream automaker, it’s the midsize sedan segment, now the absolute heartland of the American new car market. Read on to learn more on the 2014 Mazda6 in this …
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