Diesels are not gasoline engines. On a gas engine you are looking for horsepower because they don't have much torque. Horsepower comes from high RPM. Diesel operators look for torque, which on a diesel comes at low RPM. I run a Cummins ISX. Its maximum RPM seems to be somewhere around 1700-1800; the truck runs best around 1200-1300.
The operating range of rpm, for a C 12 Caterpillar diesel engine is 800 RPM to a maximum of 2400 RPM. The engine should be run at no more than 1800 RPM for a long period of time.
60 hp @4200 rpm is the power of the Oldsmobile coupe diesel 1978 engine and its maximum speed is 155 km/h (96 mph ).
The power of the engine and the maximum speed of the 1979 Peugeot 604 Turbo Diesel are 153 ps at 5200 rpm and 119 mph respectively.
The power of the engine and the maximum speed of the Cadillac Seville diesel 1979 is 93 kW / 127 ps at 3600 rpm and 96.93 mph (156 km/h) respectively.
The power of the engine and the maximum speed of the 1978 Fiat 132 wagon DIESEL are 56 kW / 77 ps at 5200 rpm and 190 km/h respectively.
75 bhp (4,250 rpm) is the power of the engine and its maximum speed is 97 mph (156 km/h).
The power of the engine and the maximum speed of the 1951 Mercedes Benz 170 D wagon Diesel are 38 hp at 3200 rpm and 62 mph respectively.
3000 rpm is red line. Red line is about 3000 rpm,
40 bhp (40.6 PS/29.8 kW) of power at 4100 rpm is the power of the Morris oxford diesel 1961 engine and its maximum speed is 129 km/h or 80 mph.
The power of the engine and the maximum speed of the peugeot 204 diesel 1970 is 45.6 PS / 45 bhp / 33.6 kW @ 5000 rpm and 125 km/h, 78 mph respectively.
for same power diesel engine produces more torque @ less rpm whereas petrol engine produces less torque @more rpm this difference is due to different combustion processes of diesel and petrol
65 PS / 64 bhp / 48 kW @ 4500 rpm is the power of the Renault 20 gtd diesel 1979 engine and its maximum speed is 146 km/h, 91 mph.