Conventional gasoline engines that can rival hybrids in efficiency—too good to be true? Not according to Mazda, which has revealed its next generation of engines that promise exceptional fuel economy—up to 30 km/liter for the Mazda2.
Called Skyactive, the range is comprised of a gasoline engine, a diesel, manual and automatic transmissions, a lightweight body, and a lightweight chassis.
For the engines, called Skyactiv-G (for gasoline) and Skyactiv-D (diesel), the secret is apparently in the compression ratio. The Skyactiv-G will feature a 14.0:1 compression ratio, made possible by direct injection, and myriad improvements including a 4-2-1 exhaust system, cavity pistons, and multihole injectors. The result is fifteen percent more fuel efficiency and torque as well as better drivability. For the diesel, it’s the world’s lowest compression ratio, also at 14.0:1. Without nitrous oxide treatments (eg urea), the engine meets Euro6 regulations. The turbocharged engine has a relatively high 5200 rpm redline, too.
Transmissions include a very compact six-speed automatic, and a short-stroke six-speed manual. The Skyactiv-Body targets 30% greater rigidity with 8% less weight, while a new front strut / rear multilink suspension will be installed in upcoming cars.
The technologies are part of a strategy Mazda calls “Building Block Strategy” to progressively implement new technologies on its vehicles. The Japanese Mazda2 will carry the Skyactiv-G engine beginning in 2011.
Following speculation that Ford will soon sell its remaining 11% stake in Mazda, the new technologies are an indication that Mazda has a strong development program, at least for the next five years. But platforms are notoriously expensive to develop, and Mazda will need the partnership with a larger-volume manufacturer like Ford. And perhaps the new technologies are an enticement for Ford to stay just a little while longer.
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