BMW B58
six-cylinder automobile engine manufactured by BMW
The BMW B58 is a turbocharged straight-six engine, which began production in 2015. The B58 replaced the N55 and was launched in the F30 340i.
The B58 is part of BMW's modular engine family, each engine using a displacement of 500 cc (30.5 cu in) per cylinder, following the B38 and B48 engine.
The B58 engine was named to Ward's World's 10 Best Engines five times, in 2016 (installed in the 340i), 2017 (M240i), 2019 (X5) 2020, (M340i). and 2024 (BMW X5 xDrive50e)
The S58 engine, which was released in early 2019, is the high-performance version of the B58. It was named to Ward's World's 10 Best Engines in 2023 (installed in the M2).
Design
Compared with its BMW N55 predecessor, the B58 features a 20% increase in boost pressure, a closed-deck engine block design, an increase in compression ratio to 11.0:1 and a slight increase in displacement from 2,979 to 2,998 cc (181.8 to 182.9 cu in) with added weight of 8 kg (18 lb).
The turbocharger is a twin-scroll design, for more efficient power delivery with less turbo lag and more power than a conventional single turbocharger, as well as for weight and space saving benefits. The intercooler - a water-to-air design - is integrated into the intake plenum, to reduce the volume of air between the turbocharger and the cylinders.
The B58, like its predecessor the N55, features direct fuel injection, variable valve timing (called double VANOS by BMW), and variable valve lift (called Valvetronic by BMW).
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