From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Analysis of engine performance issues related to poor fuel atomisation and distribution at low speeds without supercharging.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan39 | |
| Date | 5th January 1926 guessed | |
| contd :- -7- The engine was naturally designed for performance at high speeds, the ports and induction pipe passages are therefore as large as possible and the valving designed for best volumetric efficiency and scavenging, round about 5000 r.p.m. At speeds around 2,500 r.p.m. without supercharging the amount of turbulence obtainable is very low, and the distribution poor. The Solex Carburetter used cannot be expected to give good atomisation at low speeds, and with a total absence of jacketing(and no heat as with supercharging) the petrol probably enters the cylinders in 'lumps'. This explains the big drop in the B.M.E.P. curve at the lower speeds, without supercharging. Acceleration was, naturally, very poor indeed. V.{VIENNA} HALLIWELL Hs{Lord Ernest Hives - Chair}/[illegible]. | ||