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).
Comparison of ignition governor specifications for the 20/25 and Bentley chassis.
| Identifier | ExFiles\Box 101\1\ scan0210 | |
| Date | 22th April 1936 | |
| Rm{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} BY/SS.{S. Smith}5/G.22.4.36. 20/25 and BENTLEY - IGNITION GOVERNORS. With reference to memo Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/KW.20.4.36 we would point out that totally different Ignition Governors are fitted to the above chassis. The differences are as tabulated below :- | | 20/25 | BENTLEY. | |---|---|---| | Arrgt. Drawing and LOP. | E.50880 | EB.548 | | Automatic Range Flywheel Degrees. | 30° | 19° | | Hand Control Range Flywheel Degrees. | 40° | 50° | The reduced automatic movement on the Bentley was recommended in your memo Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/KT. 30.5.33. BY/SS.{S. Smith} | ||