BMW M88
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The BMW M88/3 is an I6 piston engine. It was based on the M88/1 that was used in the BMW M1's street version, with double overhead cam and four valves per cylinder. The M88/1 was in turn based on the M49 engine. The M88/3 was used in the early BMW M6 and BMW M5 (E28) and produced 286 PS (210 kW/282 hp).
S38
The S38 was an updated M88/3 and was used in the BMW M5 E34 from 1988. Displacement was enlarged from 3453 to 3535 cc. Thanks to the use of a Bosch Motronic 1.2 engine management, power grew to 315 PS (232 kW/310 SAE hp) at 6900 rpm. In 1992, with the introduction of Euro I emission legislation, BMW opted to enlarge the engine once more, to 3795 cc, with power climbing to 340 PS (250 kW/335 SAE hp) and torque going up to 400 Nm (295 ft·lbf). The S38 engine also received a Motronic 3.3 engine management. This engine was used in the restyled M5 until the E34 finished production in 1996.
See also
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