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).
On a car's water overheating issue, tracing it to excessive clearance in the water pump and proposing new limits.
| Identifier | ExFiles\Box 131\1\ scan0035 | |
| Date | 31th December 1931 | |
| By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} x766 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 2/AD2.12.31. Our 10,000 mile car suffered from water over-heating when idling and when running at low speeds. This was traced to the clearance between the rotor and the casing being .045 so at slow speeds the pump rotated without circulating the water. The clearance has been reduced to .001 and the pump is running like this in France but we should consider that this is too tight. However, we think the limits on the drawing should very definitely ensure that these clearances must not be too great. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||