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).
Oil and water temperature tests conducted on a 32-EX Phantom III without an oil cooler.
| Identifier | ExFiles\Box 131\1\ scan0300 | |
| Date | 20th August 1937 | |
| CHATEAUROUX. 1114 also 300a To. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Rm{William Robotham - Chief Engineer}/Std. c. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} STEADMAN noted Rm{William Robotham - Chief Engineer}/STD 32-EX. PHANTOM III. Tests Without Oil Cooler. We were able to get 300 miles running with direct pipe from the pump to the relief valve, cutting out the cooler. With fairly fast driving for 224 miles at an average speed of 60 MPH. the mean oil temperature was 105°c. The maximum temperature recorded was 112°c and the maximum water temperature 95°c. The air temperature was 23°c throughout. There were no very long straight roads where maximum speed could be held for more than a mile or two at a time, and the maximum figure given may not be the ultimate oil temperature that would be reached under extreme conditions. A further run of 75 miles was done at a lower speed and the oil temperature remained practically steady at 98°c. It was noted that when running slowly after a fast section, the oil temperature did not fall to water temperature as in the case with the Bentley and 25/30 and the Phantom III when the cooler is in action. It would remain at 100°c right through a town. The temperatures recorded are about 10° higher than they would have been using direct gear with the cooler in operation. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} | ||