The company plans to introduce the SkyActiv-G 1.3 domestically in the facelifted Demio (Mazda2) soon, making it the first ever 1.3 litre direct-injection gasoline engine to be equipped in a compact car built in Japan. It will offer 84 PS at 5,400 rpm and 112 Nm at 4,000 rpm for output.
The breakthrough block features a record high compression ratio (for a regular gasoline mass production automobile engine) of 14.0:1 and exhibits high efficiency, especially under high load at low rpm. In order to avoid knocking – an unavoidable issue with conventional high-compression engines – the unit features 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.
Other features include a cooled EGR system and Mazda’s first dual sequential valve timing system (dual S-VT with electronically-operated intake) – in combination with the high compression ratio, this achieves an unconventional Miller cycle (extremely delayed closure of intake valves) that improves efficiency. It also has 30% less mechanical friction, due to a narrower crankshaft, new roller followers and low-tension piston rings that also reduce oil consumption.
Partnered with i-stop, Mazda’s unique idling stop system, and a continuously variable transmission (CVT), the lump – with more than 130 patents applied for it – promises a fuel economy of 30 km per litre (under Japan’s 10-15 mode test cycle).
© 2011 Paul Tan's Automotive News. All Rights Reserved.
This story originally appeared on Paul Tan's Automotive News on Wed, 18 May 11 12:40:50 +0000.
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