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).
Water and oil temperature tests, modifications, and troubleshooting of overheating issues.
| Identifier | ExFiles\Box 11\3\ 03-page178 | |
| Date | 9th July 1930 | |
| y7941a To: Hs.{Lord Ernest Hives - Chair} From G.W.H. Hôtel de France, Châteauroux, Indre. 9/7/30. With reference to Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/MJ.7/7/30, re our report of the 5th. inst., the water temperature tests were taken at noon, and before proceeding from the garage the fan belt was tightened up choc-a-bloc, the four slats in the bonnet were opened full, there was no undershield under the gear box, also the front undershield is almost cut away. The tests were carried out during the hottest part of the day with practically no wind. We carried out further tests making the mixture over strong, and the temperature dropped 4°C. The consumption came out at 8.5 M.P.G. We have not been able to obtain a thermometer for reading higher temperatures than 100°C. for the oil. The needle on our instrument very often has been on the stop, i.e. over 100°C. Our average oil temperature has been approx. 100°C. We have resumed running with a straight through pipe from the manifold to the rear silencer made up of all the scrap pieces from other cars we have had here. We have also fitted a thermometer to our bottom water outlet. Therefore we shall be able to read the drop in temperature in the radiator? We still are of the opinion that the overheating trouble is due to localised hot spots in the cylinder head. We are also waiting for the improved water pump to be sent out., the front brakes, the radiator suspension, if you think it necessary. Note will be taken whether the oil relay is failing to function at high speeds due to the high oil temperature. It is quite O.K. in the garage. and at high speeds with oil temp at 90°c | ||