What kind of engine powers the E28 M535i?

Like its E12 M535i predecessor, the E28 M535i is not powered by a special M-developed engine but by a standard BMW powerplant. In this case, it is the exact same M30 inline-six found in the E28 535i and later versions of the E23 735i and E24 635CSi, with a bore of 92.0mm and stroke of 84.0 mm for a total displacement of 3,430cc. This SOHC iron-block unit with Bosch ME-Motronic fuel injection was offered with and without a catalytic converter, either as a customer choice or to conform to local market regulations. Without emission controls, the M30 uses a 10:1 compression ratio and develops 218 hp (DIN) at 5,200 rpm and 224 lb/ft of torque at 4,000 rpm. The catalyst version, with an 8:1 compression ratio, produces 185 hp (DIN) at 5,400 rpm and 209 lb/ft of torque at 4,000 rpm.  more