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Click on the photo to see the gallery of high-res shots of the display engine

Over on Autoblog, Damon has a report on the unveiling of the eagerly anticipated new diesel engine from Subaru. Unfortunately, there appears to be no information of any substance forthcoming from Subaru, aside from availability. Even that tidbit is disappointing, with sales apparently limited to Europe beginning in 2008. The only technical detail in the two paragraphs available on the Subaru web-site are that it will drop right in with the Subaru all-wheel drive system. Hopefully, the US market will eventually see this engine because an AWD Impreza diesel could be a pretty impressive piece, because the torque of the oil-burner would help overcome the drag of the all-wheel-drive.

[Source: Autoblog]

The "SUBARU BOXER TURBO DIESEL" engine, which will be introduced into the European market, takes advantage of the inherent superiority of Horizontally -Opposed engines, such as high rigidity and low noise and vibration, resulting in no need of a balancer shaft. In addition, it has also realized compact design, which stands on a par with the Subaru Horizontally-Opposed gasoline engine of the same displacement.

This "SUBARU BOXER TURBO DIESEL" engine will be mounted on Subaru's proprietary symmetrical AWD (All-Wheel Drive) system as in the case of the gasoline unit. In order to highlight the advantages coming from the combination of the torquey diesel engine and the great traction obtained through the SUBARU Symmetrical AWD system, this engine will be on display coupled with the drivetrain.
The vehicles fitted with the "SUBARU BOXER TURBO DIESEL" engines are slated to hit the European market in 2008.


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  • 19 Comments
      • 7 Years Ago
      ...when a Subaru Forester with a 2 litre subaru boxer turbo diesel turns up in the dealerships
      i will buy one...i`m looking forward to that day...
      • 7 Years Ago
      I am not sure of the root of Boxer when referring to engines, but there are/were piston engines with 2 or more cranks where the pistons slide opposed to each other in the same cylinder. thus there is no "head" and the pistons form two ends of the combustion chamber. I am most familiar with the German aircraft engine Junkers 205, the English boat and locomotive engine Napier Deltic but there is also the Fairbanks (U.S.) submarine engine and a Soviet Tank engine. these are all diesel and most are two stroke. Most interestingly is that the timing is often asymetric, so on the aircraft engine the intake ports were at one end of the cylinder and the exhaust port was at the other. As for weight and complexity "The typical installed weight of the 100 hp Gemini 100 (3 cylinder 6 piston 2 stroke) is less than 166 pounds, that includes the heat exchanger and accessories, and is about 34 pounds less than that of a 100 hp Continental O-200 (4 stroke 4 cylinder air-cooled "boxer" gasoline aircraft engine)." so cool.
      • 7 Years Ago
      Oh who cares about what you think the correct definition of a "Boxer" engine is, both are correct, since they both make sense. Sounds like some people have too much time on their hands and are a little controling and have chips on their shoulders about something. The point is Subie makes one helluva enigine. You cannot argue that point!
      • 7 Years Ago
      Wouldn't it be nice to see a 2 stroke, supercharged, wet sump, inlet valves on the head, exhaust ports on the sleave, 2.0L boxer diesel
      • 7 Years Ago
      A 'flat' engine with 2 cylinder banks at 180 degrees is often not a true 'boxer' engine. A true 'boxer' has a separate journal for each connecting rod. Each opposed pair of pistons has rod journals that are 180 degrees apart so the pistons are always moving in opposite directions. This provides the best posible balance. Many multicylinder flat engines are not 'boxers', as there is a common rod journal for each opposed pair and the 2 pistons are always moving in the same direction. This helps the torsional stiffness of the crankshaft, is cheaper to make, and given 6 cylinders or more the balance is acceptable.
      • 8 Years Ago
      I can only hope they hit the US market soon. The combination of the boxer diesel torque and AWD will be a symbiotic relationship.

      BTW...a boxer engine is any engine with horizontally opposed cylinders. The direction of compression makes no difference.
      • 8 Years Ago
      This is a Geneva auto-show, Could the "slated for euro market" line, just be intended for the Euro visitors to the autoshow? It doesn't specifically say "ONLY" euro market.

      I had talked to my local Subaru Salesperson a few months ago and they said that we'd see Diesels in subaru's on their showroom floor in 2008, so somehow I'm not sure if this is the nail in the coffin for those of us who want an impreza with a diesel. (heck i'd love a legacy sedan diesel too)
      • 7 Years Ago
      why do you think its called a "boxer" engine?

      cos the conrods emulate a boxers arms, so a central crank/flat engine will be a boxer

      the 2 stroke mentioned was an "OP" engine, opposing pistons, no valves, no camshaft, THREE cranks

      • 7 Years Ago
      The contributors that are commneting on the "Boxer" design engine are obviously not gearheads. The "Boxer" engine design is related to two banks of cylinders that are located 180 ° apart that function using a common centrally located crankshaft. The Chevrolet Corvair, Volkswagen 1200 Bettle and Subaru gas engines are all "Boxers".
      • 7 Years Ago
      I will also buy a legacy wagon turbo diesel in the US.
      It would be a fighting chance versus BMW 335d wagon.
      • 7 Years Ago
      can you please inform me.about the time that this diesel engine will be placed on Forester
      • 8 Years Ago
      "a boxer engine fires inwards"

      If the direction of compression was inwards, then the crankshafts would have to be to the outside. Two crankshafts would be unnecessarily complex, don't you think?
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