Rolls-Royce–Bentley L-series V8 engine as the "six and a quarter" litre engine. When new, the Rolls-Royce/Bentley V8 was rumoured to be an American engine design licence-built, but it was developed in-house by Rolls-Royce and Bentley engineers. This can be seen in its design characteristics, with features like an aluminium alloy cylinder block with wet liners, gear-driven camshaft, (initially) outboard spark plugs and porting inspired by the Rolls-Royce Merlin aircraft engine. The bore spacing of 4.75" was unlike any American V8 engine and the firing order was 1-5-4-8-6-3-7-2 something uncommon in any period American OHV V8. The deep skirted crankcase design is also rare with
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