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http://www.fhi.co.jp/english/contents/pdf_en_60853.pdf
FHI Develops a New-generation Subaru Boxer Engine
-- New Horizontally-Opposed engine,
providing superior combination of environmental friendliness and enjoyable driving --
Tokyo, September 23, 2010 - Fuji Heavy Industries Ltd. (FHI) has developed its new-generation boxer engine*
that combines the technology and know-how used in Horizontally-Opposed Boxer engines, the core technology
that has supported Subaru?s unique driving since it was first employed in the Subaru 1000 in 1966. This overall
renewal is the first in 21 years, since the second generation boxer engine was introduced in the first Legacy
models in 1989.
This new-generation Horizontally-Opposed 4 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. New-generation improvements include advances in both
environmental friendliness, such as an approximately 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 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.
* Boxer engine: Also known as a Horizontally-Opposed engine. In this design, the pistons are arranged symmetrically left and right
along the crankshaft. When the pistons move, they resemble the punches thrown by boxers, thus resulting in this
popular name.
[Major Features of the New-generation Subaru Boxer engine]
The overall structure of this 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 2,500 cc or 2,000 cc
displacement, both with 4 cylinders. These models will now
be positioned as our main engines.
The New-generation Subaru Boxer engine
・ The bore and stroke, the basic structure of this engine, have been reviewed to achieve a compact combustion
chamber as well as a long stroke, which was difficult previously due to chassis mounting conditions in boxer
gasoline engines. This allows high combustion efficiency, and generates a sufficient mid-low speed torque
with improved fuel efficiency and practicality.
・ Improved fuel efficiency has been achieved through optimization of intake port configuration and the addition
of partitions inside ports, the use of TGV (Tumble Generated Valve), and the use of an EGR (Exhaust Gas
Recirculation) cooler.
・ AVCS (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, resulting in
improvements in fuel efficiency and output characteristics.
FHI Develops a New-generation Subaru Boxer Engine
-- New Horizontally-Opposed engine,
providing superior combination of environmental friendliness and enjoyable driving --
Tokyo, September 23, 2010 - Fuji Heavy Industries Ltd. (FHI) has developed its new-generation boxer engine*
that combines the technology and know-how used in Horizontally-Opposed Boxer engines, the core technology
that has supported Subaru?s unique driving since it was first employed in the Subaru 1000 in 1966. This overall
renewal is the first in 21 years, since the second generation boxer engine was introduced in the first Legacy
models in 1989.
This new-generation Horizontally-Opposed 4 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. New-generation improvements include advances in both
environmental friendliness, such as an approximately 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 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.
* Boxer engine: Also known as a Horizontally-Opposed engine. In this design, the pistons are arranged symmetrically left and right
along the crankshaft. When the pistons move, they resemble the punches thrown by boxers, thus resulting in this
popular name.
[Major Features of the New-generation Subaru Boxer engine]
The overall structure of this 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 2,500 cc or 2,000 cc
displacement, both with 4 cylinders. These models will now
be positioned as our main engines.
The New-generation Subaru Boxer engine
・ The bore and stroke, the basic structure of this engine, have been reviewed to achieve a compact combustion
chamber as well as a long stroke, which was difficult previously due to chassis mounting conditions in boxer
gasoline engines. This allows high combustion efficiency, and generates a sufficient mid-low speed torque
with improved fuel efficiency and practicality.
・ Improved fuel efficiency has been achieved through optimization of intake port configuration and the addition
of partitions inside ports, the use of TGV (Tumble Generated Valve), and the use of an EGR (Exhaust Gas
Recirculation) cooler.
・ AVCS (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, resulting in
improvements in fuel efficiency and output characteristics.
