Engine Designations

M10       1.8 or 2.0 litter 4 cylinder single overhead cam, timing chain.

M20       2.0, 2.3, 2.5 or 2.7 litter 6 cylinder single overhead cam, timing belt.

M21       6 cyl. diesel, 2.4 litter single overhead cam, timing belt. With/without turbocharger.

M30       2.8, 3.0, 3.2 or 3.4 litter 6 cylinder single overhead cam, timing chain.

M40       4 cylinder single overhead cam, timing belt.

M41       4 cylinder diesel

M42       1.8 liter 4 cylinder dual overhead cams, timing chain.

M43       4 cylinder.

M44       1.9 liter 4 cylinder duel overhead cams, timing chain.

M50       2.0, 2.3 or 2.5 liter 6 cylinder dual overhead cams, timing chain.

M50TU   2.0, 2.3 or 2.5 liter 6 cylinder dual overhead cams, vanos (variable intake cam)

M51       6 cylinder diesel.

M52       2.0, 2.3, 2.5 or 2.8 liter 6 cylinder dual overhead cams, vanos.

N52       2.5, 3.0 liter 6 cylinder, double vanos

M60       Early M60 was 6 cylinder 2.0 and 2.3 liter engines.

M60       3.0 or 4.0 liter V8.

M62       3.5 and 4.4 liter V8.

N62       4.4 and 4.8 liter V8

M70       5.0 liter V12.

M73       5.4 liter V12.

M88       3.5 liter 6 cylinder dual overhead cams built by Motorsport for the M1.

M88/3    As above built for other models.

S14       2.3 or 2.5 liter 4 cylinder dual overhead cams, M power.

S38       3.6 or 3.8 liter 6 cylinder dual overhead cams, M power.

S50       3.0 liter 6 cylinder dual overhead cams with vanos, M power.

S50US   3.0 liter 6 cylinder dual overhead cams with vanos, M power.

S52       3.2 liter 6 cylinder dual overhead cams with vanos, M power.

S70       5.6 liter V12, M power.

            Engine designations are followed by a capacity code:

            M20B25 is an M20 engine of 2.5 liter capacity.