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The Mahle single forged piston for BMW S54B engines is specified for an 87.50mm bore and complements the S54B’s 91.0mm stroke with a 139mm rod length. It uses a 21mm wrist pin and a -9.2cc deck volume yielding roughly a 12.5:1 compression ratio, and is supplied as a single piston (part 2618). Intended for precise engine rebuilds or assemblies that require exact S54B dimensions and fitment.
Mahle MS Piston Set BMW S54B 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin +9cc 12.5 CR - Single
