German automotive manufacturer BMW is rolling out a new M straight-six engine, the BMW S58. The innovative engine, which will replace the S55 engine as the face of the M Division, integrates a number of exciting features including a 3D printed cylinder head core.
Introduced in 2013, the S55 represented the return to a six-cylinder engine configuration for BMW’s M3 Sedan and M4 Coupe. Its successor, the new S58, continues this tradition while providing a range of technical updates and performance improvements. The new engine model will first be integrated into X3 M and X4 M models and will be built into the next generation of M3 and M4 vehicles. Eventually, the S58 will also be installed in BMW’s M2.
The S58 is based on the B58 engine, a modular, three-liter engine which has undergone a redesign to meet the performance requirements for BMW’s M Division as well as tighter emission requirements for automotive manufacturers.
In terms of performance, the S58 is superior to its predecessor, as even its entry-level iteration delivers 480 PS (473 hp) and 600 Newton meters of torque (442 lb-ft). To put that into perspective, the entry-level engine is more powerful than the engines currently found in the M3 CS and M4 CS models.
A tuned up version of the S58, used in the X3 M and X4 M Competition models, delivers roughly 510 PS (503 hp), though BMW expects that the engine could exert even more power in new sportscar models in the M Division.
Most excitingly for us is the fact that the new engine boasts a cylinder head produced using 3D printing. According to BMW, additive manufacturing enabled its engineers to realize the lowest possible weight for the cylinder head while optimizing its geometry for thermal management (it integrates coolant channels into its structure).
Other upgrades to the engine include an indirect intercooler, updated compressors, a new flow-optimized air intake system to reduce pressure losses and an electronically controlled wastegate. The engine also integrates three large radiators, an additional engine oil cooler and a separate transmission oil cooler to keep temperatures controlled, as well as a map-controlled oil pump with an added suction stage.