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 consumption tests for the 20/25 Programme and Bentley models, detailing piston ring configurations.
| Identifier | ExFiles\Box 144\3\ scan0100 | |
| Date | 10th August 1936 | |
| (Swdl.{Len H. Swindell} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} (Mths.{Reg Matthews} Y 1220 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/MJ.10.8.36. OIL CONSUMPTION. 20/25 PROGRAMME. Tests of four-ring pistons. (a) Stopped as instructed. Measure blow-by.{R.W. Bailey - Chief Engineer} (b) Unstopped. Plain high pressure gas ring. Two stronger & sectioned. Turned scraper 30 lb/sq.in. unit press. Normal and Castrol 2. BENTLEY. Thin oil test. (a) High press. gas rings. (b) Chevrolet scraper with (a). (c) Complete set of individually cast rings. (d) Four ring piston. Best gas and scraper ring so far found. Highest unit pressure middle ring cut L shaped. Send Brookes drawing of 20/25 piston to copy. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||