Ferrari 290 S

The Vittorio Jano-designed V12 engine received some technical solutions and experience from the Lancia’s Formula One V8 engine.^[3] It was an evolution of the one earlier installed in the 290 MM sports racing car, now with a four overhead camshaft configuration. The new engine was installed in the same, unmodified tubular chassis from its predecessor.^[4] The spyder body, coachbuilt by Scaglietti, was updated to incorporate the new technical regulations introduced by the FIA.^[2]

Unlike its predecessor, the 290 S did not score any victories. Only two examples were produced (chassis numbers 0646 and 0656), and both were further converted into a larger displacement derivative, the 315 S, one before 12 Hours of Sebring, the second after the race.^[5]

The new Jano V12 engine, codenamed Tipo 136, received a new configuration with twin overhead camshafts per cylinder bank. The internal measurements of 73 by 69.5 mm (2.9 by 2.7 in) of bore and stroke, and the resulting total capacity of 3,490.61 cc (3.5 L; 213.0 cu in) remained the same as before. At a 9:1 compression ratio, the power output was 330 PS (243 kW; 325 hp) at 8000 rpm. For comparison, the 290 MM had a maximum power of 320 PS at 7200 rpm. The fuel feed was also updated, now with six Weber 42DCN carburettors, instead of three 36IR4s. Ignition was by twin spark plugs, served by four coils. The engine used a dry sump lubrication system.^[6]

The tubular steel chassis, known as tipo 520, was the same as on the 290 MM that in turn was derived from the 860 Monza. The front suspension was independent, and the rear was a De Dion type with transverse leaf springs. Hydraulic shock absorbers were installed on both ends. Transmission and braking remained the same as before.^[2][7]