The Hispano-Suiza J12 was a luxury automobile made by Hispano-Suiza

Hispano-Suiza

Hispano-Suiza was a Spanish automotive and engineering firm, best known for its luxury cars and aviation engines in the pre-World War II period of the twentieth century. In 1923, its French subsidiary became a semi-autonomous partnership with the parent company and is now part of the French SAFRAN...

 from 1931 to 1938. It replaced the Hispano-Suiza H6

Hispano-Suiza H6

The Hispano-Suiza H6 was a luxury automobile from the 1920s. Introduced at the 1919 Paris Motor Show, the H6 was produced until 1933. Roughly 2,350 H6, H6B, and H6C cars were produced in total....

.

The J12 was powered by a V12 engine

V12 engine

A V12 engine is a V engine with 12 cylinders mounted on the crankcase in two banks of six cylinders, usually but not always at a 60° angle to each other, with all 12 pistons driving a common crankshaft....

 with pushrod-operated overhead valves. The engine initially displaced 9.4 litre with bore and stroke both being 100 mm (3.9 in) and, with a compression ratio of 5.0:1, delivered 220 hp at 3000 rpm. Two cars were fitted with long-stroke engines displacing 11.3 litre and delivering 250 hp, and several J12s were later upgraded to the larger engine. Each engine block was machined from a single 700 lb (318 kg) billet.

Hispano-Suiza suspended automobile production in 1938 to concentrate on the manufacture of aircraft engines.