Subaru reveals third-generation Boxer engine

Subaru reveals third-generation Boxer engine

Subaru’s heavyweight parent company – Fuji Heavy Industries Ltd. (FHI) has just announced the new-generation Boxer engine that will start appearing in its vehicles from early next year.

This third generation engine replaces the motor that first appeared in the first Legacy in 1989 and has been developed subsequently to meet emission regulations and market expectations.

Boxer engines have been the core technology that has supported Subaru’s unique driving since the first generation motor first powered the Subaru 1000 way back in 1966.

This latest third generation Horizontally-Opposed 4 cylinder petrol engine in two and 2.5 litre capacities, showcases Subaru’s latest engineering research and development.

The engine is entirely new, starting from the basic structure, while all the advantages of the horizontally-opposed layout have been maintained: lightweight, compact, low centre of gravity, and superior vibration balance.

New-generation improvements include advances in both environmental friendliness, with a reported 10% improvement in fuel efficiency, and driving performance.

FHI designed the new engine with consideration of the technology’s expandability and potential capability to receive further upgrades meeting future environmental measures.

Major mechanical features of the New-generation Subaru Boxer engine are a longer stroke, improvements in practical torque and fuel economy. A more compact combustion chamber aids the greater torque and fuel efficiency, together with Tumble Generated Valves in the intake ports and an Exhaust Gas Recirculation 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 for greater 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 about a 30% reduction in friction loss and improves fuel efficiency and revolution response.

Cooling has been optimised by using separate engine cooling circuitry for the block and the cylinder heads, resulting in improvements in fuel efficiency and output characteristics.

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