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).
Experiment comparing standard and RM26 bushes, noting their effect on valve closure and suggesting a conclusive test on a PIII car.
| Identifier | ExFiles\Box 96\2\ scan0181 | |
| Date | 1st December 1926 guessed | |
| (3) The rig was fitted with four RM{William Robotham - Chief Engineer}26) bushes and two standard for a comparison and again subject to a night's rest. On rotating the mechanism next day it was noticed that the four eccentrics containing the working in the RM{William Robotham - Chief Engineer}26) bushes were entirely free and all Valves closed perfectly. The remaining two eccentrics fitted with standard bushes were stuck and followed the Rocker. When these Valves were moved to the closed position it was found that both were off their seats,- Upon releasing the plungers, they became properly closed. This experiment has been completed four times with the same results in each case. A conclusive test would be to fit a set of these modified bushes to a PIII Car. 3)EX, would be most suitable for such an experiment because it is subject to severe misfiring on starting from cold in spite of the fact that arctic oil is being used to over come this trouble. RM{William Robotham - Chief Engineer} | K.F. Scholes. | ||