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Developed by the powertrain team behind the 6.7-liter Power Stroke engine for super duty trucks, the all-new 3.0-liter V6 Power Stroke unit promises 250ps, 440 lb-ft of torque, and an anticipated 5175kg of towing capacity.


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New boxer engine unveiled

Fuji Heavy Industries (FHI) has taken the covers off its new-generation boxer engine that the Japanese company says combines the technology and know-how used in horizontally-opposed boxer engines, the core technology that has supported Subaru’s driving dynamics since it was first employed in the Subaru 1000 in 1966.

The new-generation horizontally-opposed, four-cylinder gasoline engine, the third-generation Subaru boxer engine, showcases Subaru’s latest engineering research and development. It offers a new performance level by further refining Subaru’s unique expertise in boxer engine technology. The engine was entirely renewed, starting from the basic structure, while all the advantages of the horizontally-opposed layout were maintained: lightweight, compact, low center of gravity, and superior vibration balance.

The new-generation improvements include advances in both environmental friendliness, such as a 10% improvement in fuel efficiency, and driving performance for smooth acceleration in all speed ranges. Furthermore, FHI designed the new engine with consideration of the technology’s expandability and potential capability to receive further upgrades meeting future environmental measures.

FHI has built a new factory at the Gunma Oizumi Plant exclusively for the production of this new-generation boxer engine. This new plant offers state-of-the-art production facilities that make full use of FHI’s engine manufacturing know-how developed to date, as well as a highly efficient production system delivering products meeting the highest quality standards.

The overall structure of the new engine has been totally renewed, by reviewing the bore and stroke for the basic structure to allow a longer stroke than current engines. It is designed to achieve high efficiency in basic performance, allowing the smooth and sporty rotational properties for which horizontally-opposed engines are known, while also making improvements in practical torque and environmental friendliness. This engine is available with 2,500cc or 2,000cc displacement, both with four-cylinders.

Improved fuel efficiency has been achieved through optimization of intake port configuration and the addition of partitions inside ports, the use of tumble generated valve, and the use of an EGR cooler. An active valve control system is used on both intake and exhaust valves. For the intake side in particular, an intermediate lock system allows valve timing to be advanced or delayed for precise control over intake and exhaust valve timing, allowing maximum engine performance in output, fuel efficiency, and exhaust emission. The use of lightweight primary moving parts, such as pistons and connecting rods, and a highly efficient and compact oil pump provides an approximately 30% reduction in friction loss and improves fuel efficiency and revolution response. Cooling has been optimized by using separate engine cooling circuitry for the block and the head, thus resulting in improvements in fuel efficiency and output characteristics.

New boxer engine: horizontally-opposed four-cylinder DOCH 
Displacement 1,995cc
Compression ratio 10.5
Bore x Stroke 84 x 90 mm
Max. output 109kW
Max. torque 196Nm


 

29 September 2010


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