How is the North American 3.2-liter M3 engine (S52) different from the 3.0-liter (S50 B30 USA)?

Unlke the Euro-spec S50 B32, the S52 powerplant is an evolution of the standard production M52 engine. However, it incorporates the following changes over its S50 B30 USA predecessor: -Increased bore to 86.4mm (from 86.0mm) and increased stroke to 89.6mm (from 85.8mm) for a total displacement of 3,152cc (from 2,990cc) -More finely balanced camshafts -Valve lifters, springs and spring seats with reduced mass -Revised intake and exhaust systems -OBD II (On-Board Diagnostics, version II) compliance -Horsepower unchanged at 240 hp (SAE) at 6,000 rpm -Torque increased to 236 lb/ft at 3,800 rpm (up from 225 lb/ft at 4,250 rpm) NOTE: E36 M3s equipped with the ZF five-speed automatic transmission are rated at 225 lb/ft of torque at 3,800rpm. More.

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