320i M50TUB20 The M50B20 was updated with variable valve timing (called VANOS by BMW) on the intake camshaft in 1993. Peak torque became available 500 rpm lower, at 4200 rpm. [2] Applications: 1992-1994 E36 320i 1992-1996 E34 520i M50B24 This is a 2.4 L engine based on the 2.5 L M50B25, with a