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).
Placement of oil coolers on Wraith and Bentley engines with larger crankshafts.
| Identifier | ExFiles\Box 145\3\ scan0072 | |
| Date | 15th December 1936 | |
| Hives Swcll - Please do this, particularly at temps approaching boiling. PM Rm.{William Robotham - Chief Engineer} 1235 Oil Coolers with larger diameter Crankshaft and re-arranged engine - Wraith and Bentley. If this oil cooler is found necessary the neat arrangement of the oil pipes becomes a problem, and it would much simplify the layout if the cooler could have been on the suction side of the water pump. If you think it would be worth while we should like a test made to determine the effect of this additional resistance in the pump suction. There are positions on the pressure side of the pump which are possible, but none come in so neatly as the one on the suction side. Regarding the increased heating anticipated, personally I think you may find there is actually less heat generated, because though the rubbing velocity has increased the pressure per square inch has been dropped to a greater extent, and the p.v. = constant figure is much improved. It is agreed however that one cannot be certain. Da.{Bernard Day - Chassis Design} Ph | ||