In 2003, BMW launched an all-new 2-seater sports car, the Z4 Roadster. The Z4 lineup offered a pair of models, each powered by a version of BMW’s famously smooth and sonorous inline 6-cylinder engine. Firmly planted suspension, standard run-flat performance tires and state-of-the-art stability electronics were anchored in a remarkably rigid Roadster body/chassis structure; all of this was clothed in a unique and captivating look.
BMW Z4 Coupe
Most vehicle manufacturers’ 6-cylinder engines are in the V-6 format, whose compactness is advantageous for small or midsize cars with front-wheel drive. By contrast, BMW’s inline 6-cylinder engines are brilliant for their smoothness and sound, and BMW customers as well as professional auto critics have come to treasure them for these attributes. BMW has retained this inline format while developing it toward reduced weight, more compact dimensions – and even more brilliant performance, smoothness and sound. An increase in fuel efficiency and even tighter control of emissions were also set as goals for the new engine.The result of this quest is a new generation of 6-cylinder engines, called N52. Compared to its predecessor, the M54 engine family, the N52 achieves notable progress on all fronts (N52 3.0-liter of 3.0si models vs. previous M54 3.0-liter):
Greater power, 255 hp vs. 225 hp – a very impressive 85 hp/liter.
Greater torque, 220 lb-ft. vs. 214, and even stronger torque delivery across the broad range of engine speeds.