How is the 3.8-liter M5 engine (S38 B38) different from the 3.6-liter version (S38 B36)?
The final evolution of the S38 powerplant, the S38 B38, was introduced in later versions of the European-spec E34 M5. In this application, the bore was increased (to 94.6mm) and the stroke lengthened (to 90mm), raising the displacement to 3,795cc. Though the added capacity makes the S38 B38 the largest six-cylinder production BMW engine of the modern era, it represents only a portion of the major revisions developed by BMW Motorsport at this time. Others include: -Larger intake and exhaust valves -Lighter pistons -Shorter connecting rods -Increased compression to 10.5:1 -Bosch Motronic 3.3 engine management system -Distributorless ignition with six coils -Redesigned intake and exhaust manifolds -Revised throttle butterfly linked to Motronic engine control -Dual-mass flywheel with harmonic balancer -Metal catalysts for reduced backpressure and better heat conduction The S38 B38 is normally rated at 340 hp (DIN) at 6,900 rpm and 295 lb/ft of torque at 4,750 rpm. However, a cleaner versio
