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).
Report page detailing Test No.4, focusing on car operation and the effect of surging oil on sediment in the oil sump.
| Identifier | ExFiles\Box 135\3\ scan0083 | |
| Date | 25th October 1934 guessed | |
| 9. but the cleanest oil to circulate to every point requiring lubrication under the most unfavourable conditions, namely when the greatest amount of abrasives in present, it follows that its efficiency in meeting severest service conditions would be even higher. TEST No.4. CAR OPERATION There naturally comes to mind to the engineer the question of what happened to the sediment and water in the base of an oil sump in actual car operation on the road. By this it is meant what disturbance of the sediment and water is produced by the surging of oil resulting from violent rounding of curves and severe brake applications. To disclose the quality and characteristics of the oil in this type of service the oil sump and pump assembly was installed on the running board of a car and the pump driven from a pulley mounted on the right rear wheel. The pulley ratios being such as to produce an oil output from the pump representing a speed of 60 miles per hour when the car is travelling but 25 miles per hour. Since a maximum retardation effect in feet per second produced by the brakes can be obtained at speeds of 25 miles an hour or lower and since the car can be made to round sharp corners at a speed where violent skidding takes place, it is apparent that maximum surging conditions and tendency to disturb any sediment in the base of the sump can be produced. The following tests were carried out: Using the standard baffles incorporated in the oil sump by the manufacturer and with a full quantity of oil attempts were made to surge and disturb the body of the oil as much as possible, by the use of brakes and swerving. Brakes were applied so violently that considerable quantity of oil was pitched out of the forward end of the sump. It was found that with the most violent rounding of curves | ||