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BMW N54 Engine For Sale
Made on the basis of the 3-liter M54B30, this engine is the supercharged version by means of a double turbocharger.
The general architecture, dimensional characteristics and materials are taken from the aspirated 3-liter. It is in fact an in-line 6- cylinder with bore and stroke measurements equal to 84×89.6 mm, for a total displacement of 2979 cm³. Although the most refined N52 engines equipped with the Valvetronic system were already in production, it was decided to rely on the 3-liter M54 because its structure in aluminum alloy with cast iron liners it is better suited to withstand the thermal and mechanical stresses deriving from double supercharging.
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Two small turbochargers were chosen for the dual turbocharging, in order to favor the engine torque rather than the power at high revs. These turbochargers work in parallel, serving three cylinders each and providing a maximum boost pressure of 1.6 bar. Another feature is the 10.2: 1 compression ratio, which is unusually high for a supercharged engine. Thanks to the characteristics described, the N54 engine pushes from very low revs, as it drastically reduces the turbo-lag typical of supercharged engines.
The presence of the direct injection system (located in the cylinder head near the spark plug) does not allow, for reasons of space, the insertion of the Valvetronic device, which is therefore absent. However, the VANOS double variable valve timing device is present.
This engine is a milestone in the production history of the Bavarian manufacturer, as it marks the return of a supercharged BMW petrol engine after twenty years of absence. The last, in fact, was the M30B34MAE engine, mounted on the BMW 745i E23 and discontinued in 1986.
The N54 engine was ranked first as the best engine of the year 2007 : its production was divided into four different variants. In the autumn of 2009 the N55 engine was introduced, an evolution of the N54 engine, as it allows the same performance, but with only one turbocharger and other new features.
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