when a custom-built racing car competed at the Brooklands circuit in the United Kingdom. The car was entered by Louis Coatalen, who was chief engineer of the Sunbeam Motor Car Company. It was named 'Toodles V' (after Coatalen's pet name for his wife) and achieved several speed records in 1913 and 1914. The V12 engine had a displacement of , an aluminum crankcase, iron cylinders with L-shaped combustion chambers, a cam-in-block valvetrain and a V-angle of 60 degrees. Each bank of the engine consisted of two-cylinder blocks with three cylinders each. Valve clearance was set by grinding the relevant parts, the engine lacking any easy means of adjustment. This reflected the intention for the engine to be later used in aircraft since any adjustment method that could go wrong in flight was to be avoided. As initially built, the V12 was rated at at 2,400 rpm and weighed approximately . Amongst the first production cars to use a V12 engine were the 1915 Packard Twin Six, the 1915 National V12 engine and the 1917 Weidely Pathfinder; all of which were built in the United States. 1920s to 1940s During the late 1920s, the number of marques offering V12 engines for their passenger cars increased and peaked in the 1930s. The lack of vibration and sound, inherent smoothness, and increased power were cited as key benefits for V12 engines. Automobile petrol produced in the 1920s and 1930s had lower octane rating, leading to lower engine performance ratings, and vibration isolating engine mounts were rarely fitted to the passenger cars in the 1920s and the early 1930s. Adding more cylinders to the engine was one of several techniques for performance increase. European passenger cars with V12 engines were: Fiat 520 'Superfiat' (1921–1922) Daimler Double-Six (several models built at different times from 1926 to 1938) Horch 12 (1931–1934) Hispano-Suiza J12 (1931–1938) Maybach Zeppelin DS 7 (1928–1930) and DS 8 (1930–1938) Rolls-Royce Phantom III (1936–1939) Tatra 80 (1931–1935) American passenger cars with V12 engines were: Auburn V-12 Speedster (1932–1934) Cadillac V-12 (1931–1937) Franklin V-12 (1932–1934) Lincoln K-series/Model K (1931–1940) Custom (1941–1942) Continental (1940–1948) Lincoln-Zephyr V-12 (1936–1942) H-series (1946–1948) Packard Twin Six (1916–1923 and 1932) Packard 905 (1916–1923) Packard Twelve (1933–1939) Pierce-Arrow Twelve (1932–1938) Pierce Silver Arrow (1933) The economic hardships caused the Great Depression meant that all American automakers except for Lincoln had discontinued production of V12 engines by the end of the 1930s.