Rolls-Royce 25/30 HP Berlina by Arthur Mulliner from 1937, 4257 cc, max. speed 130 km/h

The Rolls-Royce 25/30 built between 1936 and 1938 is an updated version of the 20/25 with larger engine to provide more power, as over-large bodies had often been fitted to the earlier model leading to complaints about its performance.

The in-line 6-cylinder, overhead-valve 25/30 hp engine is similar to that used in the 20/25 but increased in capacity to 4,257 cc (259.8 cu in) by increasing the bore from 3.25 inches (8.3 cm) to 3.5 inches (8.9 cm), with the stroke remaining at 4.5 inches (114.3 mm).

The compression ratio is 6:1. A single proprietary Stromberg downdraught carburettor replaced the Rolls-Royce one, and magneto ignition was no longer fitted, but a standby coil was provided. The four-speed gearbox is mounted in unit with the engine, and a traditional right-hand change used. Synchromesh is fitted to third and top gears.

The riveted chassis has rigid front and rear axles suspended by half-elliptic springs with hydraulic dampers. Braking is on all four wheels assisted by a mechanical servo, famously under licence of Hispano-Suiza. Separate rear brakes are fitted for the handbrake. The traditional Rolls-Royce radiator with triangular top was used with vertical louvres, the opening angle of which is controlled thermostatically to control engine cooling.

Arthur Mulliner was the 20th century name of a coachbuilding business founded in Northampton in 1760 which remained in family ownership. The business was acquired by Henlys Limited in 1940 and lost its separate identity.

Henry Mulliner (1827-1887) of Leamington Spa was the second son of Francis Mulliner (1789-1841) of Northampton and Leamington Spa and a direct descendant of the Mulliner who built the business making mail coaches in Northampton around 1760. Henry and his wife born Ann Robson had six sons and six daughters[

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