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Rolls-Royce Twenty
The Rolls-Royce Twenty built between 1922 and 1929 was Rolls-Royce's "small car" for the 1920s and was produced alongside the 40/50 Silver Ghost and Phantom. It was intended to appeal to owner drivers but many were sold to customers with chauffeurs.
==Engineering==
A new inline-6 cylinder overhead valve engine was designed for the car of 3127 cc with a bore of 76 mm and stroke of 114 mm. Unlike the Silver Ghost engine, the cylinders were cast in one block and the cylinder head was detachable. Both coil and magneto ignition were fitted. The early cars had 3-speed manual gearboxes with the change lever in the centre of the car, but this changed in 1925 to a four-speed unit with traditional right-hand change. The power was transmitted to the rear axle via a standard propeller shaft with a universal joint at each end.
The substantial chassis had rigid front and rear axles suspended by half-elliptic springs, with braking initially only on the rear wheels. Four-wheel brakes with mechanical servo were introduced in 1925. The famous Rolls-Royce radiator with triangular top was fitted, and early examples had enamel-finished horizontal slats, later changing to a nickel finish and finally becoming vertical.
In 1920 a chassis cost £1100 with, typically, a complete tourer-bodied car costing around £1600. With coachwork to the factory recommended weight the car could reach , but many owners had large limousine bodies fitted, with the inevitable detrimental effect on performance.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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