148 Bentley 3/4.5 litre (1926) YM 7165 by Robert Knight Via Flickr: Bentley 3- 4.5ltr. (1919-30) Engine 4398cc S4 Production 665 Competition Number 231 Alistair Littlewood Owner M J Littlewood Competition Class 11 Special Sports-Cars and Saloons over 3000cc Unsupercharged and over 2250cc Supercharged Chassis No. AH1481 Engine No. AH1487 Registration Number YM 7165 (London) BENTLEY SET www.flickr.com/photos/45676495@N05/albums/72157623759855498/ The 3.0 L (2,996 cc or 183 cu in) straight-4 engine was designed by ex-Royal Flying Corps engineer Clive Gallop and was very advanced for the time, It was one of the first production car engines with 4 valves per cylinder, dry-sump lubrication and an overhead camshaft. The four valve SOHC Hemi design, with a bevel-geared shaft drive for the camshaft, was based on the pre-World War I 1914 Mercedes Daimler M93654 racing engine. Un-tuned power output was around 70 hp (52 kW), allowing the 3 Litre to reach 80 mph (129 km/h). The Speed Model could reach 90 mph (145 km/h); the Super Sports could exceed 100 mph (161 km/h). There were three main variants of the 3-litre and they became known by the colours commonly used on the radiator badge BLUE was the standard model with 117.5 in (2,984 mm) wheelbase from 1921 to 1929 or long 130.0 in (3,302 mm) wheelbase from 1923 to 1929 RED This used a 5.3:1 high compression engine in the 117.5 in (2,984 mm) wheelbase chassis and was made from 1924 to 1929 GREEN Made between 1924 and 1929 this was the high performance model with 6.3:1 compression ratio and short 108 in (2,743 mm) wheelbase chassis. 100 mph (160 km/h) performance was guaranteed As time went on and replacement engine parts became hard to source or even obsolete many 3 litre Bentleys were upgraded to the 4398cc power plant found in the Bentley 4.5 litre. The 4.5 litre was built 1927-31 with production overlapping the 3 litre for its first two years. A total of 720 4½ Litre cars were produced between 1927 and 1931, including 55 cars with a supercharged engine popularly known as the Blower Bentley. The displacement was 4,398 cc producing 110 hp (82 kW) for the touring model and 130 hp (97 kW) for the racing model. The engine speed was limited to 4,000 rpm Diolch am 95,901,601 o olygfeydd anhygoel, mae pob un yn cael ei werthfawrogi'n fawr. Thanks for 95,901,601 amazing views, every one is greatly appreciated. Shot 07.08.2022, at the VSCC Prescott Speed Hill Climb, Prescott, Gloucestershire REF 162-148