The Douvrin family is an all-aluminum inline-four automobile engine designed in the early 1970s and produced from 1977 to 1996 by Compagnie Française de Mécanique, a joint-venture between PSA and Renault located in the town of Douvrin in northern France.

The Douvrin engine on the contrary, had a conventional (external) gearbox setup, and was longitudinally or transversely mounted depending on car model.

It is often confused with the somewhat similar 2.2 litre Chrysler Type 180 engine, which displaced 2.2 L (2,155 cc) Renault offered the 2.2 in fewer configurations than the smaller version: The 2.1 L (2,068 cc) Diesel version was derived from the 2.0 L (1,995 cc) petrol version by a bore reduction from 88 to 86 mm (3.46 to 3.39 in) and a stroke extension from 82 to 89 mm (3.23 to 3.50 in).

Cast-iron cylinder liners were used to withstand the higher compression ratio of Diesel combustion.

The cylinder head was a Ricardo-type pre-chamber design fed by a mechanically controlled fuel pump.