Opel diesel straight-4 2.5 L S8U 770 engines

Opel diesel straight-4 2.5 L S8U 770 79 HP at 4000 RPM, 155 N⋅m at 2200 RPM engine

It's an 2499 cc (2.2 UK qt.) internal combustion reciprocating Inline 4 engine. It has bore/stroke ratio of 93 mm × 92 mm (3.66 in × 3.62 in). This engine was rated 59 kW (79.12 hp) at 4000 rpm and 155 N⋅m (114.32 lbf⋅ft) of torque at 2200 rpm.