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).
Engine piston performance, compression, and lubrication issues.
| Identifier | Morton\M22\ img047 | |
| Date | 21th August 1919 | |
| Contd. -3- R3/G21.8.19. succession. This depended on speed only. I noticed that 1 EX. was particularly tight in compression, showing that the pistons and valves held the gas extremely well. I am very pleased with this, and I believe it is largely obtained by having the piston rings lower down, as is possible with the lower position of the piston pin. This feature is very advantageous to slow running, and pulling well at slow speeds, and starting on the switch. In conclusion, my impression is that the most important things to work at at the moment are, pistons, and piston lubrication. There is no sign in 1 EX of any smoke at the exhaust, or of any lubrication having reached the plugs. One imagines that it might be wise to gradually increase the lubrication of the pistons by a spray or jets, until this occurs. R.{Sir Henry Royce} See other sheets on piston knocks. Special note, if sample oils or castor oil has any marked effect. o Extra oil on all the time, including while warming up. | ||