JAPAN: Mazda shows off direct injection 1.3

By Graeme Roberts | 20 May 2011

Mazda said its 'Skyactiv-G 1.3' direct injection 1.3-litre petrol engine will be the first of its next-generation technologies to go on sale. The engine was shown at the Automotive Engineering Exposition in Yokohama this week.

The engine achieves a record high compression ratio (for a regular petrol mass production automobile engine) of 14.0:1 and high efficiency, especially under high load at low rpm. In order to avoid knocking – an unavoidable issue with conventional high-compression engines – the engine has a number of new technologies, such as piston cavities that are specially designed to support ideal combustion, and multi-hole injectors that enable precise fuel injection control.

Mazda plans to introduce the 1.3 to the Japanese market in the facelifted Mazda Demio (known overseas as the 2) during the first half of 2011. It will be the first 1.3-litre direct-injection petol engine fitted in a compact car manufactured in Japan. Combined with Mazda's unique idling stop system, i-stop, and a continuously variable transmission (CVT), the new Demio/21.3 will achieve fuel economy of 30km/litre on Japan's 10-15 mode test cycle.

Mazda has applied for over 130 patents in relation to the engine.

Mazda unveils 'Skyactiv' technology