This straight engine configuration is the most common in cars with a displacement up to 2.4 Litres. The usual "practical" limit to the displacement of straight-4 engines in a car is around 2.7 litres. However, Porsche used a 3.0 L four in its Porsche and Porsche sports cars; and larger four-cylinder engines used in industrial applications, such as in small trucks and tractors, are often found with displacements up to about 4.6 L. Classic and Antique vehicles tended to have larger displacements to develop horsepower and torque. The Model A Ford was built with a 3.3 litre straight-4 engine. Diesels for stationary, marine and Diesel use (which run at relatively low speeds) are made in much larger sizes.