Though an M535i was launched in 1980 with the same body style, it had very little Motorsport division technical input. That version had only a single cam, but for the 1985 M5, the engine from the M1 supercar was used, albeit without dry sump lubrication. It had a high compression ratio, cross-flow aluminium cylinder head with larger inlet and exhaust ports, twin overhead camshafts, Bosch fuel injection, an oil cooler and low restriction dual exhaust. It was too much for the standard 5-speed, so BMW had Getrag produce a special close-ratio version with dog-leg first gear. The suspension used a patented Track Link system at rear, but was conventional MacPherson strut up front with shorter springs and uprated shocks all around. Massive four-wheel vented discs with ABS meant excellent stopping power. Inside the driving position was perfect and there were power seats plus air-con.
BMW M5 (1985) Specifications
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