Lamborghini Miura built at the Lamborghini factory between 1983 and 1987 from an unused Miura S chassis. This was made for Jean Claude Mimran, one of the Mimran brothers, the then owner of Lamborghini. Most experts do not recognize this as an "official" SVJ due to it being converted (albeit done by the factory) long after the Miura went out of production. Further Miuras were subsequently upgraded to SVJ specifications (trying to imitate the real factory SVJs) by various garages of Switzerland, USA and Japan. Another one-off, the Miura Roadster (actually more of a targa-model, but without any removable roof) was built
V12 engine where 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, weighing about . The engine powered the car (named ‘Toodles V' for Coatalen's wife Olive's pet name) to several records in 1913 and 1914. In 1909 Renault pioneered aero V12s with a 60 degree air-cooled engine with individual finned cylinders and F-head valve arrangement, driven by single camshaft in the crankcase. This was developed to a unit (96 x 140 mm) which weighed and produced at 1,800 rpm. The propeller was driven from the nose