How is the M88 engine unique?

The M88 engine that powers the E26 M1 is based on the 3,453-cc (via a bore of 93.4mm and stroke of 84mm) M30 inline-six that powered the contemporary BMW 6 Series and 7 Series models of the era. However, the M88 received a number of unique components including: -A four-valve cylinder head derived from the 3.0CSL racing engines. The head is made of two pieces, the lower part comprising the combustion chamber and coolant chamber, while the upper portion contains the camshaft bearings and cup tappets.

-Individual throttle bodies for each cylinder. Measuring 46mm each, this is the first production engine from BMW Motorsport to utilize them. -Kugelficsher mechanical fuel injection -Magneti-Marelli electronic ignition -Dry sump lubrication Tuned for street use, the M88 engine produces 277 hp (DIN) at 6,500 rpm and 239 lb/ft of torque at 5,000 rpm.

Racing versions produced 470 hp for Group 4 (normally-aspirated) and up to 850 hp for Group 5 (turbocharged). More.

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