SkyActiv
| SKYACTIV-G | |
|---|---|
 |
|
| Overview | |
| Manufacturer | Mazda |
| Also called |
|
| Production | 2012-present |
| Combustion chamber | |
| Configuration | Straight-4 |
| Displacement |
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| Cylinder bore |
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| Piston stroke |
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| Cylinder block alloy | Aluminum |
| Cylinder head alloy | Aluminum |
| Valvetrain | DOHC |
| Compression ratio |
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| Combustion | |
| Fuel system | Gasoline direct injection |
| Fuel type | Gasoline |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Chronology | |
| Predecessor | |
SKYACTIV is a brand name for a series of technologies developed by Mazda which increase fuel efficiency and engine output. The initial announcement of the SKYACTIV technologies included new engines, transmissions, body, and chassis, which appeared in Mazda products from 2011.
The precursor of SKYACTIV, which featured a Mazda SKY-G 2.3-litre direct injection gasoline engine, a Mazda SKY-D 2.2-litre diesel engine, a SKY-Drive automatic transmission, a Mazda Kiyora with SKY-G 1.3 engine and SKY-Drive automatic transmission, was unveiled at the 40th Tokyo Motor Show in 2008. The SKYACTIV concept features a revised suspension geometry, improved automatic and manual transmission, and various improvements to Mazda's excellent L- engine such as direct injection, upgraded exhaust manifold, increased compression ratio for cleaner burn and higher efficiency, etc. Mazda's previous chassis for the Mazda 3 and Mazda 6 carry-over.
The SKYACTIV-G or formerly SKY-G is a family of direct injection gasoline engines. The engine compression ratio is increased to 14:1. To reduce the risk of engine knock at high compression, residual gas is reduced by using 4-2-1 engine exhaust systems, implementing a piston cavity, and optimizing fuel injection. In addition, combustion duration is shortened by intensifying air flow, increasing injection pressure, and using multi-hole injectors.
It features an all-aluminum construction with chain-driven dual overhead camshafts with VVT and gasoline direct injection; with direct ignition, it meets ULEV emission standards. SKYACTIV-G engines for the U.S. market have a lower compression ratio of 13:1 allowing them to operate on standard instead of premium fuel with an approximate 3-5 percent reduction in torque and fuel economy.
The SKYACTIV-G 1.3 is a variant with 1,298 cc (79 cu in) engine displacement and features a 71.0 mm (2.80 in) bore and a 82.0 mm (3.23 in) stroke.
The engine was unveiled at the 2011 Automotive Engineering Exposition.
Five Mazda engineers were awarded the 2011 Japan Society of Mechanical Engineers Medal on April 20, 2012 specifically for the "[d]evelopment of [a] gasoline engine (1.3L) with a super-high compression ratio and achieving fuel efficiency of 30km per liter (under Japan's 10-15 cycle)".
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Wikipedia