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).
Calculated versus tested cylinder capacity, and the instructed acceptable range.
| Identifier | ExFiles\Box 65\4\ scan0310 | |
| Date | 27th March 1925 | |
| [REDACTED] c. to Hs.{Lord Ernest Hives - Chair} X.8050 BY/SS{S. Smith}4/DB.{Donald Bastow - Suspensions}27.3.25. & Re EAC. - Cylinder Capacity. The calculated cylinder capacity for 4 to 1 compression Piston is 26.000 cu.ins. with piston at top of its stroke. We understand from Unit Test that the average capacity of the first 40 engines is 25.5 cu.ins. Mr Bailey instructs that all engines should give a capacity between 24.5 and 25.5 cu.ins. The original cylinder head model when fitted with standard tulip headed valves gave 20 cu.ins. capacity. BY/SS.{S. Smith} | ||