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For the first time in a Subaru engine, the centerlines of the cylinder bores do not intersect with the crankshaft axis to reduce friction during the piston downstroke; instead, there is a crank offset of 8 mm (0.31 in). Overall thermal efficiency is 40% due to the adoption of lean-burn combustion with an excess air ratio (λ) of 2. [32]
Subaru was the first to offer chain-driven overhead cam (OHC) technology in the small, air-cooled engine market with its Subaru Industrial EX engine series. [5] A standard for high-performance automotive engines, chain-driven OHC technology allows the intake and exhaust valves to be positioned for optimum engine performance.
The Subaru six-cylinder engines are a series of flat-6 engines manufactured by Subaru, made in three distinct generations. The ER27, derived from the Subaru EA first-generation flat-4 , was used as the sole engine option in the premium model 1988–91 Subaru Alcyone VX (XT6 in the United States).
Volkswagen had experimented with this idea during the 1950s and made two air-cooled boxer prototype diesel engines that were not turbocharged. VW installed one engine in a Type 1 and another in a Type 2. [64] The Subaru engine was rated at 110 kW (150 PS; 148 hp) and 350 N⋅m (260 ft⋅lbf) with a displacement of 2.0 liters.
Subaru's industrial products division, began manufacturing "Star" engines for Polaris Industries snowmobiles in 1968 but engine manufacturing operations ended in 1998 when Polaris Industries started to build their own Liberty two-stroke engines. Subaru remains an invested partner with, and supplier of pistons to, Polaris.
The EX engine series from Subaru Industrial Power Products includes nine models total, with power ranges from 4.5 to 14 horsepower. All engines in this line are four-cycle, single-cylinder, air-cooled engines.
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