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Bentley 3½ L

In order to get a new car into production in the shortest possible time after the takeover of Bentley Motors, Rolls-Royce based the new 3 ½ litre Bentley on the experimental Rolls-Royce ‘Peregrine’. It used a similar engine and gearbox to the Rolls-Royce 20/25, although substantial modifications had been made to ensure that the new car had a much more sporting character with outstanding performance to match.

Production numbers
1933 - 1935
6 cylinders, capacity 3699cc. Separate cast iron block and two-piece aluminium crankcase with detachable cast iron 6-plug head. Overhead pushrod operated valves. 7-bearing crankshaft with vibration damper. Pressure-fed lubrication with relief valve feeding rocker shaft and timing gears.
Ignition system
Coil ignition system with standby coil mounted together. Centrifugal advance with hand override.
Cooling system
Engine driven pump and fan. Thermostatically controlled radiator shutters.
Twin SU carburettors with hand-operated choke mounted on water-heated manifold.
18 gallon rear tank with double SU pumps mounted on firewall. Electric gauge.
4-speed gearbox in unit with engine. Synchromesh on 3rd and top. Right hand gearchange. Clutch, single dry plate type. Open drive propeller shaft.
Semi-elliptic leaf springs front and rear. Hydraulic dampers, equipped with Ride-Control from 1934.
Internal expanding 4 – wheel operation with independent handbrake on the rear wheels. Mechanical brake servo motor driven from the gearbox.
Steering: Worm and nut.
Chassis lubrication
Centralised ‘One-Shot’ lubrication system.