The Bentley 4½ Litre Supercharged utilised a classic front-engine, rear-wheel drive (FR) layout paired with a hand-built open two-seater or four-seater Le Mans racer/vintage body style.
Its core engineering architecture embodied the rugged aesthetics and zenith of late-1920s British mechanical craftsmanship: a robust steel ladder chassis, front and rear suspension comprising traditional semi-elliptic leaf springs with rigid live axles, and all-round mechanical drum brakes.
Power came from a 4.4-litre (4,398 cc) inline-four engine developed at the behest of legendary racing driver Tim Birkin, innovatively fitted with a prominent nose-mounted Roots-type supercharger engineered by Amherst Villiers (positioned ahead of the radiator) to force-feed air into the combustion chambers.
This radical setup raised power output from 130 hp in standard road trim to over 240 hp in track specification, mated to a 4-speed non-synchronised manual gearbox.
The Bentley Blower was conceived during an iconic era of motorsport—a project initially opposed by founder W. O. Bentley, yet destined to become the brand’s enduring spiritual totem.
Founder W. O. Bentley firmly believed that pure, large-displacement naturally aspirated engines were supreme, whereas Sir Tim Birkin and the "Bentley Boys" insisted on forced induction to extract maximum output.
Although mechanical reliability setbacks kept it from taking the overall Le Mans crown, the Blower's sheer speed and intimidating presence at Brooklands cemented its status as an immortal symbol of courage and velocity in vintage motorsport, laying the foundation for Bentley’s high-performance luxury pedigree that endures today.
As an irreplaceable, century-old vintage Le Mans competition car of immense value, the preservation and upkeep of the Bentley Blower must adhere strictly to museum-grade classic vehicle protocols.
The vehicle requires long-term storage in a dedicated climate- and humidity-controlled indoor facility to protect its hand-formed aluminium coachwork and heavy timber/steel chassis frame from corrosion or structural warping.
On the mechanical front, because the architecture of its massive Roots supercharger and large-capacity inline-four engine is thoroughly archaic and relies entirely on manual lubrication, comprehensive pre-drive checks of the fuel lines, mechanical ignition timing, supercharger oil levels, and cooling system are mandatory.
All intricate adjustments involving the high-load supercharger unit, non-synchromesh gearbox, and mechanical drum brake clearances must be entrusted exclusively to world-class pre-war Bentley specialists equipped with bespoke period tools, with high-speed endurance runs on modern highways or punishing road surfaces strictly prohibited.
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