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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 Brake s 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
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