![]() The EG33 used a single toothed timing belt which drove the exhaust camshafts on each bank in addition to the water pump (mounted on the right bank) the intake camshaft on each cylinder bank was driven in turn by a set of helical gears via the belt-driven exhaust camshaft. Unlike the SOHC EJ22 it shared some dimensions with, the EG33 featured dual overhead cams both engines used four valves per cylinder. Īfter the SVX was discontinued, Subaru did not offer a six-cylinder engine until the EZ30 was developed and released for the Subaru Outback. The EG33 was exclusively fitted to the Alcyone SVX, where it was paired with the 4EAT automatic transmission in both front- and all-wheel-drive configurations. Similar to how the six-cylinder ER27 is related to the earlier four-cylinder EA82, the EG33 shared bore and stroke dimensions with the contemporary four-cylinder EJ22. īoth JDM and USDM versions of the ER27 used multi-point electronic fuel injection. The valve timing system is belt-drive using two individual timing belts, curiously one belt uses a spring tensioner (like the EA82) whilst the other uses a hydraulic tensioner (like the EJ22). The upper intake manifold then bolts to the lower section and is unlike the EA82 or EJ22 "spider" manifold designs in that there is no central plenum chamber. The intake manifold uses a two piece design with a lower section bolting to the heads containing the coolant bridge, injectors and various vacuum lines. For instance, the oil and water pumps are unique to the ER27, sharing similar bolt patterns and design to the EA82, but being of a higher flow in both cases. While recognised as bearing many similarities to the Subaru EA82 engine, there are numerous differences in design between the two engines and a large portion of parts are unique to the ER27. Like the EA series engines, the ER27 engine featured 2-valve cylinder heads with hydraulic lash adjusters and the ER27 and EA engines shared the same bore, stroke, and spacing. The ER27 designation was the first time Subaru incorporated the engine's displacement into the engine designation and all subsequent engine codes have retained this nomenclature. When the ER27 was introduced, it was the only water-cooled flat-6 automobile engine on the market. These advantages are evidence of the vision that Subaru has in using the Horizontally-Opposed Engine.Reciprocating internal combustion engine Subaru ER27Ĭreated as a refined luxury engine with improved power over the EA82T, Subaru introduced the ER27 engine in November 1985 for the Subaru ACX-II concept car, shown at the Tokyo Motor Show and billed as the 'concept car of the near future.' The concept went into production as the Subaru Alcyone VX (Subaru XT6 in North America) in August 1987, the exclusive application for the ER27. A prodigious 350-Nm of peak torque is delivered at a lower 1,600 rpm – providing smooth, free-breathing performance at any speed. And whilst meeting the ultra-clean EURO5 emission standards, the engine delivers even more torque compared to previous models. The result is a more compact combustion chamber and greater fuel efficiency, and combined with a higher pressure common rail fuel injection, an improved oxidizing catalyst with closed Diesel Particulate Filter (DPF), a variable nozzle turbo and electric power steering, these all help to reduce fuel consumption and CO2 emissions.Ĭeramic glow plugs also quicken starting in cold weather. The SUBARU BOXER, however, was originally designed with rigidity in mind, allowing the 92.0 mm x 75.0 mm bore and stroke of the 2.0-litre petrol four-cylinder engine to be changed to a square 86.0 mm x 86.0 mm design. When petrol engines are converted to diesel, strengthening of the engine block usually makes the engine bigger and heavier. The world's first commercial Horizontally-Opposed Diesel Engine developed for passenger vehicles is the SUBARU BOXER DIESEL.
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