How is the S38 engine in the E34 M5 different from the version used in the E28 M5?

The early E34 M5 uses an evolution of the 24-valve inline-six found in the E28 M5 and E24 M635CSi/M6. Despite its official designation of S38 B36, this BMW Motorsport powerplant technically remains a 3.5-liter, with a bore of 93.4mm (same as the previous engine) and a stroke of 86mm (up 2mm on the early S38) for a total capacity of 3535cc (up from 3453cc). The added stroke is due to a new forged steel crankshaft, though the camshafts were also changed.

Compression is up slightly (10:1 versus 9.8:1). Further enhancements include: -An electronically-controlled butterfly valve in the inlet manifold to provide better low-rpm and mid-range power -Bosch Motronic fuel injection for precise metering of the air/fuel mixture -Improved flywheel -Equal length stainless steel headers -Three way ceramic catalysts (similar to those used on the M70 V12 engine) The S38 B36 is rated at 315 hp (DIN) or 310 hp (SAE) at 6,900 rpm and 266 lb/ft of torque at 4,750 rpm. Like the earlier S38 B35, it carries ... more.

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