Bentley Speed Six
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Desiring more power, Walter Owen Bentley added two cylinders to the straight-4 engine used in his 4½ Litre car, creating the 6½ Litre Bentley in 1926. A high-performance Speed Six model was famed for its racing success.
Engineering
The 6 L car was inspired by the Rolls-Royce Phantom I as a closed-body car. Although based on the 3 L, it incorporated many improvements. The cone-type clutch was replaced by a dry-plate design, and four wheel finned-drum brakes were used.Like the four cylinder engine, Bentley's straight-6 included 4 valves per cylinder, an exotic technology at the time, as well as a single-piece engine block and head cast in iron. Bore and stroke dimensions were identical to the 4½ L car at 100 mm (3.9 in) and 140 mm (5.5 in), respectively, giving a total of 6.6 L (6597 cc/402 in³) of displacement.
180–200 hp (134–149 kW) was produced, and the car was faster and more reliable than the supercharged Bentley Blower produced at the same time.
A large variety of wheelbases were produced for such a low-production car, ranging from 132 in (3353 mm) to 152½ in (3873 mm).
Speed Six
The Speed Six was introduced in 1928 as a more sporting version. It would become the most-successful racing Bentley, claiming victory at the 24 Hours of Le Mans in 1929 and 1930 with drivers Woolf Barnato, "Tim" Birkin, and Glen Kidston.But the Speed Six was fitted as a conventional road-car, and many were used apart from racing. Two saloon-bodied Speed Sixes even served as patrol cars for the Criminal Investigation Department of the Western Australia Police Force.
Production
- 6½ L: 363
- Speed Six: 182
| align="center" colspan=19|Bentley road car timeline | ||||||||||||||||||||||
| 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | ||||||||||||||
| Independent | Rolls-Royce | Volkswagen | ||||||||||||||||||||
| Sports | 3 L | 4½ Blower | WWII | |||||||||||||||||||
| Saloon | Six | 4/3½ 4¼/V | VI | R | S1/S2/S3 | T1 | T2 | Mulsanne | CFS | |||||||||||||
| Premium | 8 L | Camargue | Arnage | |||||||||||||||||||
| coupé | Corniche | Continental | C R/S/T | C GT | ||||||||||||||||||
| Convertible | Azure | C GTC | ||||||||||||||||||||
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