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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.
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]
A governor, or speed limiter or controller, is a device used to measure and regulate the speed of a machine, such as an engine.. A classic example is the centrifugal governor, also known as the Watt or fly-ball governor on a reciprocating steam engine, which uses the effect of inertial force on rotating weights driven by the machine output shaft to regulate its speed by altering the input flow ...
The Subaru EA-71 engine was produced in two different designs; from 1976 to 1994, originally the first design was a redesign of the EA-63 block, known as the "Narrow Case EA71" then Subaru completely redesigned it to make the newer version known as "Fat Case EA71" which also led to a stroked version known as the EA81. The availability in USA ...
Most small engines use a governor to maintain a constant engine speed under varying loads. Some engines also have a mechanism for the user to adjust the engine speed. Rather than directly controlling the opening of the carburetor throttle, this is usually achieved by adjusting the governor, which in turn regulates the engine speed higher or lower.
The Subaru Industrial SX engine series from Subaru Industrial Power Products are designed specifically for use with snow throwers, also known as snow blower. The line includes four models, the 6 horsepower SX17, the 7 horsepower SX21 and the 9.5 horsepower SX30 and the SX40-14 horsepower [ 1 ]
Subaru currently offers a Partial Zero Emissions Vehicle certified Legacy, Outback, Impreza, [83] XV/Crosstrek [84] and Forester models [85] which are available for sale anywhere in the U.S. Subaru PZEV vehicles meet California's Super-Ultra-Low-Emission Vehicle exhaust emission standard. [81] All other models have been certified LEV2.
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.