BMW M60 Engine

Development and testing of the aluminum V8 engines began in 1984. The engine was committed to production in 1986. Roughly 570 test engines were built throughout the M60 development program. M60 is the reference code for the V8 engine manufactured by BMW from 1992 to 1995. In its simplest form a V8 engine is basically two straight-4 engines sharing a common crankshaft.

Nikasil plating which is applied similarly to that as hard chrome plating, was used rather than cast iron for the cylinder bores. The Nikasil application to cylinders was later replaced by Alusil as Nikasil proved to be problematic. Sintered connecting rods were specially manufactured as a single piece and then fracture split for a closer fit and less distortion, giving the connecting rods, crankshaft journals better fit and longevity.

The block weighed in at a mere 25 kg, the two cylinder heads 60 kg and the combined total dry weight of the engine weighed in at 203 kg making the new V8 engine admirable to all V8 fanatics largely due to its power to weight ratio figures compared to other eight’s. Valve covers were manufactured from light weight magnesium, and the intake manifold was injection molded from nylon to save further weight.

The M60 engine was designed with four stainless steel valves per cylinder with a reliable but heavy double row timing chain drive and dual overhead camshafts. Valves had hydraulic lash adjustment to reduce maintenance, and the camshaft chain drive was self adjusting. There was no distributor with each cylinder having its own ignition coil. Fuel injection and ignition were managed by Bosch’s Motronic ECU (engine control unit), computer system.

The M60 was offered in two sizes, the 3.0 litre M60B30 engine and the 4.0 litre M60B40 engine. The two motors were designed very similarly, but neither crankcase, cylinder heads or crankshaft were interchangeable between these two engines.

The M60B30 had a bore of 84 mm and a stroke of 67.6 mm giving it a displacement of 2997 cc. Compression ratio was 10.5:1 with an output of 160 kW and 215 Hp at 5800 rpm and 290 N·m at 4500 rpm and was fitted with a cast iron crankshaft.

The M60B40 had a bore of 89 mm and a stroke of 80 mm giving it a displacement of 3982 cc. Compression was 10.0:1 with an output of 210 kW and 282 Hp at 5800 rpm and 400 N·m at 4500 rpm and it was fitted with a forged crankshaft.

 

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