Turbodiesels can be designed to have a more acceptable spread of torque over their speed range or, if being built for commercial use, can be designed to improve torque output at a given speed depending on the exact use. Naturally aspirated Diesels, almost without exception, have a lower power output than a petrol engine of the same capacity whilst the same time requiring stronger (and thus heavier) internal components such as the pistons and crankshaft to withstand the greater stresses of the Diesel engine's much higher compression ratio.
Turbodiesels can be designed to provide a more even torque curve across their speed range or, if intended for commercial use, can be engineered to enhance torque output at a specific speed tailored to the particular application. Naturally aspirated Diesels generally have lower power output than petrol engines of similar capacity while requiring stronger internal components like pistons and crankshafts to handle the increased stresses of Diesel engines' higher compression ratios.