For all the attention being lavished on hybrids and electric vehicles, the tried and true internal combustion engine isn?t going anywhere. They?ll be around for years to come, growing ever more efficient. Mazda?s new ?Skyactiv-G 1.3? engine is a case in point.
The Japanese automaker says the 1.3-liter direct injection mill unveiled this week delivers 70 mpg. To achieve that, Mazda raised the compression ratio to 14:1, then installed revised pistons and other mods to prevent knocking. Multi-hole fuel injectors deliver fuel more precisely, further improving combustion.
Mazda says the direct-injection engine gets 30 kilometers per liter (70 mpg) under Japan?s 10-15 mode test cycle. It pumps out 83 horsepower at 5,400 RPM and 82 pound-feet of torque at 4,000 RPM.
That isn?t a lot, but then the engine will appear next year in the Japanese-market Mazda Demio (shown above), a subcompact known elsewhere as the Mazda 2. The Demio will get stop-start tech and a continuously variable transmission to further improve fuel economy.
Skyactiv is Mazda?s name for its next generation of gasoline and diesel engines. We won?t see the Sykactiv 1.3 here in North America, but a 2.0-liter version reportedly good for 150 ponies and 40 mpg is slated for the CX-5 next year.
Photos: Mazda
Source: http://www.wired.com/autopia/2011/05/mazda-skyactiv-g-1-3-engine-70-mpg/
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