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).
Test report on oil consumption for unit U.75 using standard piston rings.
| Identifier | ExFiles\Box 144\3\ scan0075 | |
| Date | 9th July 1936 | |
| X1220 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell}11/JH. 9.7.36. 18-G-IV Oil Consumption Unit U. 75. Standard piston rings. Total mileage to date 6448. This run with breather pipe turned upwards. There is no breather from rocker cover to air silencer on this unit. The following figures show no gain from this test. Miles run 191 Oil used 6 pts. Average Speed 43 m.p.h. Oil cons. 260 m.p.g. Petrol cons. 12.6 m.p.g. Average air temp. 21°C. " oil " 30°C. " water " 86°C. Oil press. 29 lbs. sq/in. Hs{Lord Ernest Hives - Chair}/W.Brazier. | ||