The S52 is a higher performance version of the M52 which used for the post-facelift (1996-1999) North American E36 M3, replacing the S50B30US.
Compared to the S50 engine used elsewhere, the S52 is less powerful and features more in common with the regular M52 engine. As per the North American M52 engine, the S52 uses an iron block, aluminium head and single VANOS. Unique to the S52 is a bore of 86.4 mm (3.4 in) and stroke of 89.6 mm (3.5 in) for a total displacement of 3,152 cc. The engine is rated at 240 hp (179 kW) at 6,000 rpm and 236 lb·ft (320 N·m) of torque at 3,800 rpm.[11]
Other upgrades over the M52 include lighter camshafts with more lift and duration, piston rings, valve springs and the exhaust system.[WIKI]
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