Rolls-Royce Merlin exhaust flow and waste-gates, meant that this option was rejected in favour of the two-stage supercharger. Fitted with the two-stage two-speed supercharger, the Merlin 60 series gained 300 horsepower (224 kW) at over the Merlin 45 series, at which altitude a Spitfire IX was nearly faster than a Spitfire V. The two-stage Merlin family was extended in 1943 with the Merlin 66 which had its supercharger geared for increased power ratings at low altitudes, and the Merlin 70 series that were designed to deliver increased power at high altitudes. While the design of the two-stage supercharger forged ahead, Rolls-Royce also
Rolls-Royce V8 engine Rolls-Royce V8 engine In the history of Rolls-Royce automobiles, only two distinct series of V8 engines have been produced. The first powered the 1905 "V-8" model and was made in very small numbers. The second was developed in the 1950s and was known internally as the "L Series" of engines. The L Series V8, in highly developed form, continues to power Bentley automobiles into the 21st century. Three 1905 Rolls-Royce V-8 automobiles were manufactured using the company’s first V-8 engine design but only one example was sold, a car using the two seat "Legalimit" body. This proved unreliable and was