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).
Alterations required for the ignition governor for the 12-EX engine.
| Identifier | ExFiles\Box 65\1\ scan0161 | |
| Date | 14th May 1926 | |
| HS.{Lord Ernest Hives - Chair} COPY. X8G85 To RHC.{R. H. Coverley - Production Engineer} from HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rml/LG14.5.26. IGNITION GOVERNOR. With reference to the ignition governor for 12-EX. This will now require altering in accordance with RL/M4.5.26. (1) The small torsion springs E.73203 to be arranged with no initial set up - it is left for the weight of the small piston E.72503 to return the governor weights to the normal position. (2) Spring E.74947 to be fitted above the large relay piston. (3) Spring E.74839 to be fitted to the magneto with a set up to give a pull of 2 lbs. in the fully retarded position. (4) .100" deeper relay chamber to E.74837. (5) Cross head to E.74837 attached. (6) Rod E.72649 .100" longer. Otherwise, the relay will be standard i.e., standard weights etc. If you will let us have this unit, we will fit it to the test bed engine and try it out. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||