the last decade have spurred their widespread adoption in certain markets, notably in Europe where they (as of 2014) make up over 50% of new car registrations. Turbodiesels are generally considered more flexible for automotive uses than naturally aspirated Diesel engines. 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. These factors give naturally aspirated Diesels a poor power-to-weight ratio. Turbocharger units weigh very little but can offer significant power, torque, and efficiency improvements. Fitting a turbocharger can bring a Diesel engine's power-to-weight ratio up to the same level as an equivalent petrol unit, making turbodiesels desirable for automotive use, where manufacturers aim for comparable power outputs and handling qualities across their range, regardless of the type of power unit chosen. See also Injection pump Turbocharged petrol engines Variable geometry turbocharger References Diesel engine technology Turbochargers Diesel engines