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).
Issues and observations on a car's transmission and engine performance.
| Identifier | ExFiles\Box 136\4\ scan0065 | |
| Date | 3rd November 1933 | |
| -2- Ha/Gry.{Shadwell Grylls}10/KT.3.11.33. (3) When in neutral accelerating the engine causes the car to move forward with a small jerk. (4) At times when idling the oil pump could be heard making a hissing noise. (5) On this car the second speed brake would not take full torque particularly if full throttle were used immediately after changing gear when the engine speeded up to its limit without accelerating the car. This is not an inherent fault in design as 1st. gear gripped perfectly but is suggestive of a likely trouble. To sum up, we like the gear change of this epicyclic transmission better than the Daimler or Armstrong Siddeley. It is instructive in what happens when an epicyclic box is used in conjunction with a normal clutch. Some form of automatic clutch withdrawal when idling is necessary to overcome the idling noise and lurching of the car. This would apply equally to any all epicyclic transmission. Ha/Gry.{Shadwell Grylls} | ||