The S50 is a straight-6 engine from BMW M that evolved from the M50, replacing the four-cylinder S14 engine used in the E30 M3. Like the M50, the S50 has an iron block and aluminum head with four valves per cylinder.
S50B30: The S50B30 produces 282 hp, has a bore of 86 mm, a stroke of 85.8 mm and a compression ratio of 10.8:1. The redline is 7,200 rpm. The S50 has an individual throttle body for each cylinder, single-VANOS (variable valve timing on the intake camshaft), Bosch Motronic M3.3 engine management and redesigned intake and exhaust systems. The S50B30 configuration was used in the 1992-1995 E36 M3 (except for U.S.) and the limited edition M3 GT model from 1995, which produced 295 hp. It featured different camshafts and a redesigned sump and oil pump.
S50B32: In 1995, the S50B32 replaced the S50B30. Power output increased to 316 hp and the displacement increased to 3.2 L; 195.3 cu in (3,201 cc), due to an increased stroke of 91 mm and a slight increase in bore to 86.4 mm. The S50B32 has double-VANOS (variable valve timing on both camshafts) and a secondary oil pick-up was added. The compression ratio is 11.3:1 and the redline is 7,600 rpm. Engine management is the Siemens MSS50, with 3 knock sensors. The S50B32 configuration was used in the 1995-1999 E36 M3 (except Canada and the United States), and the 1996-2000 Z3 M Coupe and M Roadster (except Canada and the United States).
In the United States, a less powerful engine called the S50B30US was used, which shares more in common with the regular M50 engine than the other S50 versions. In 1996, the S50B30US was replaced by the BMW S52 engine in the United States and Canada only.
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