ratio of 8.1:1 and produces . Applications: 1975-1979 E21 320— Solex 32-32 DIDTA carburettor 1975-1979 E21 320i— USA only, Bosch K-Jetronic mechanical fuel injection The M64 version produces . It has a compression ratio of 9.3:1 and uses Bosch K-Jetronic mechanical fuel injection. Applications: 1975-1978 E21 320i 1975-1979 E12 520i The M31 version uses a KKK BLD turbocharger operating @ 7psi and produces . It has a compression ratio of 6.9:1 and uses Schafer PL 04 mechanical fuel injection. Applications: 1973-1975 2002 turbo Related engines The highly successful M12 turbocharged motorsport engine was based on the M10 engine block. The S14 engine used in the E30 M3 was based on the M10 block. See also List of BMW engines References M10 Straight-four engines Gasoline engines by model