Bentley 4½ Litre and 4½ Litre Supercharged

Bentley 4½ Litre

Bentley 4½ Litre and 4½ Litre Supercharged
(1926 – 1930)

Bentley 4 1/2 Litre Supercharged, 1931, #MS3934, Vanden Plas Tourer. Brute force was the hallmark of the supercharged Bentley.

If it hadn’t been for the fact that the Bentley 3 Litre showed little potential for a further increase in performance and the Bentley 6 1/2 Litre was prone to consume tyres at an alarming rate there might never have been a Bentley 4 1/2 Litre. Around the end of 1927 series production started of the new model with an engine designed to the proven pattern of the Litre. Collecting victory after victory on various race tracks the Bentley 4 1/2 Litre became highly successful. Based on the 4 1/2 Litre the sensational ‘Blower’ Bentley was created. A Roots-type supercharger by Amherst Villiers gave 9 1/2 lbs boost at 3,500 rpm. To run a Bentley 4 1/2 Litre Supercharged in Le Mans a minimum of 50 cars had to be produced for homologation purposes. Though the engine had been extensively modified lubrication was poor and cooling problems were immense. At Le Mans never and rarely ever in another major race Blower Bentleys finished first.

Technical Data:
4 cylinder in-line engine; iron cylinder block and cylinder head cast in one piece (Bentley 4 1/2 Litre Supercharged engine extensively modified and Amherst Villiers Supercharger system Roots fitted), bore x stroke 100 x 140 mm, capacity 4,398 cc; 4 valves per cylinder, light alloy crankcase, dual ignition by 2 magnetos; cone type clutch, speed gearbox; spiral bevel final drive, suspension by semi-elliptic springs front and rear; 4-wheel brakes; wheelbase 2,984.5 mm (117,5 in) or 3,302 mm (130 in); tyre size 5.25 x 21 or 5.25 x 31 1/2 or 5.25 x 32 1/2 (Bentley 4 1/2 Litre Supercharged 6 x 21)

4½ Litre Supercharged
Bentley 4 1/2 Litre, 1928, #KM3086, Corsica Tourer. This body was transferred from 1926 car onto this chassis – more than 50 years ago…

No. made:


Bentley 1/2 Litre (including 6 cars, which were built
after the take-over by Rolls-Royce)


Bentley 4 1/2 Litre Supercharged (including cars, which
were built solely for competition)