Of all the car manufacturers, one need to have some extra respect for the Japanese car maker Mazda, for their commitment experiment with the engine technology. Mazdar is the only car manufacturer in the world who has pursued the development of rotary engine, and has put it in mass produced cars, when rest of the carmakers pulled their hands from the project owing to its high costs. Although Mazda’s rotary engine didn’t manage to get very successful, it’s a valiant effort without question.
The Japanese company now seems to have made some breakthrough in engine technology with its latest engine namely SKYACTIV-G 1.3. Unlike the rotary engine, this one is a normal internal combustion unit, with a displacement of 1.3-liters. However, with its exceptional compression ratio of 14.0:1 the engine has achieved the feat of being rated with a fuel efficiency figure of 30kmpl under Japan’s 10-15 mode cycle. To counter knocking at low rpms, the new engine employs a variety of new technologies, such special engine cavities for pistons and multi-hole injectors which enable precise fuel injection control. Mazda will unveil the engine at the Automotive Engineering Exposition that will be held from May 18 through 20, 2011, at the Pacifico Yokohama convention center near Tokyo, Japan.
Mazda has applied for over 130 patents in relation to the engine (as of the end of February, 2011). SKYACTIV TECHNOLOGY is the umbrella term for Mazda’s range of next-generation technologies – including gasoline and diesel engines, transmissions, and a new body and chassis – that significantly improve vehicle driving dynamics as well as environmental and safety performance.
Main features of the SKYACTIV-G 1.3 engine
• Highly efficient automobile gasoline engine and the world’s first to achieve a compression ratio of 14.0:1
• Multi-hole injectors enable precise fuel injection control for ideal combustion
• Mazda’s first dual sequential valve timing system (dual S-VT with electronically-operated intake) in combination with the high compression ratio achieves an unconventional Miller cycle (extremely delayed closure of intake valves) that improves efficiency
• Compact combustion chambers have a longer stroke for better efficiency
• Piston cavities are specially designed to support ideal combustion
• 30 percent less mechanical friction, due to a narrower crankshaft, new roller followers and low-tension piston rings that also reduce oil consumption
• Various countermeasures to prevent knocking, including a cooled EGR system
• An updated version of Mazda’s innovative idling stop system, i-stop, improves fuel economy by eight percent. It operates with a higher frequency, requires less fuel to restart, and achieves a smoother restart
• A lightweight and highly rigid aluminum alloy engine block
Major specifications of the SKYACTIV-G 1.3
• Inline four-cylinder 1.3-liter direct-injection engine (with i-stop)
• Engine displacement: 1.298?
• Bore and stroke: 71.0mm x 82.0mm
• Compression ratio: 14.0:1
• Maximum output (net): 62k?@5,400rpm (84ps@5,400rpm)
• Maximum torque (net): 112Nm@4,000rpm