![]() ^ a b c Tanikawa, Kiyoshi (August 28, 2020)."2020 Subaru Levorg officially debuts in Japan – SGP platform new 1.8L turbo boxer engine and EyeSight X". "Subaru Levorg, also known as the WRX's wagon cousin, revealed in production form". 2021–present JDM Subaru Legacy Outback (BT5).Displacement: 1,795 cc (1.8 L) DOHC, turbocharged. ![]() In April 2022, Subaru had to suspend production of Forester, Outback and Levorg after it discovered a sensor in CB18 engine malfunctioned. ![]() The CB18 engine is also fitted to the Subaru Legacy Outback for the Japanese market. In October 2020, Subaru announced the CB18 also would be fitted to the top-of-the-line 'Sport' trim of the 5th generation Subaru Forester in the Japanese market other models of the Forester are equipped with the mild hybrid FB20D e-BOXER. Engine weight of the CB18 has been reduced by 14.6 kg (32 lb) compared with the FB16. In addition, the CB18 achieves its peak torque at a lower engine speed. Compared to the FB16 used in the previous generation of the Levorg, the CB18 offers decreased fuel consumption (16.6 km/L (39 mpg ‑US) for the CB18 and 16.0 km/L (38 mpg ‑US) for the FB16, both using the JC08 mode) and increased torque (300 N⋅m (31 kg⋅m 220 lb⋅ft) for the CB18 and 250 N⋅m (25 kg⋅m 180 lb⋅ft) for the FB16). The first engine in the series is designated CB18, a 1.8 litre dual overhead cam 16-valve engine featuring dual AVCS with gasoline direct injection and a turbocharger. The third generation FB/FA connecting rods are split diagonally (also called an offset or asymmetrical connecting rod) to allow a longer piston stroke without increasing the width of the engine, but the horizontally-split connecting rods are stronger. The connecting rods in the CB engine are split horizontally, like those in the second generation EJ engines. A small single-scroll turbocharger was equipped to maintain charge air volume and improve throttle response. The injector is positioned next to the spark plug in the center of the combustion chamber to ensure the lean mixture will ignite reliably. Overall thermal efficiency is 40% due to the adoption of lean-burn combustion with an excess air ratio (λ) of 2. This offset reduces friction during the piston downstroke. įor the first time in a Subaru engine, the centerlines of the cylinder bores do not intersect with the crankshaft axis instead, there is a crank offset of 8 mm (0.31 in). Compared to the preceding FB series, the CB is shorter the bore pitch (centerline to centerline spacing between adjacent cylinders) has decreased from 113.0 to 98.6 mm (4.45 to 3.88 in) and the overall crank length has decreased from 350.5 to 315.9 mm (13.80 to 12.44 in). It is the fourth-generation boxer engine family from Subaru. According to Subaru, CB stands for Concentration/Compact Boxer. The CB engine was first introduced in August 2020 with the second-generation Levorg. It is the fourth generation of Subaru boxer engines, following the first ( EA, 1966–94), second ( EJ, 1989–2021), and third ( FB/ FA, 2010/2012–present) generations. See what makes a boxer engine tick for yourself in the video above.įollow Motor Authority on Facebook, Twitter and YouTube.The Subaru CB engine is a gasoline boxer-4 engine used in Subaru automobiles. There's a lot going on while we simply work an accelerator and shift a transmission. It is cool to see how such a unique engine operates. The pistons' firing order of 1, 3, 2, 4 means the left side fires before the right in a wonderful synchronicity as the connecting rods work to send the power through the crankshaft, and ultimately, through the transmission.Įric Harrell created the 3-D model that Jason uses in the video and you can find links to Eric's Thingiverse files to print out a boxer engine of your own on Jason's YouTube channel. The term "boxer" engine is sometimes referenced due to the fact the pistons mimic boxing gloves punching at the intake and exhaust valves.ĬHECK OUT: Do performance brake rotors have better cooling? That means there are different crank pins for each piston. The pistons themselves lay flat-like other flat engines-but what makes Subaru's design distinct is the fact the pistons move in and out together. There are flat engines, but Subaru's boxer engine is different altogether. In this video, Jason, host of Engineering Explained, walks viewers through the unique design of a Subaru boxer engine and how it operates. The term is thrown around often, but what actually constitutes Subaru's "boxer" engine? With the insightful mind of Jason Fenske and a 3-D printed model of a 4-cylinder boxer engine, we're all in for some learning.
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