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 cooling system performance and detonation during testing.
| Identifier | ExFiles\Box 179\3\ img082 | |
| Date | 12th March 1912 | |
| -2- A.77/TML/12.3.12.Cont'd The water in the cooling tank was kept during the test between 67.5°C and 71°C and this temperature is considered as approx inlet temperature to the engine. The temperature in the outlet water pipe was kept at 79°C, but the water temperature at the rear end of cylinder head varied from 86°C at 65 B.H.P. to 98°C at 38 B.H.P. showing definitely that far too much water passes straight through from the pump to the outlet pipe. The water flow at 5/8ths R.P.M. the maximum speed at which the engine was run was 376 lbs/min. A Curve of the water flow is attached. Detonation. During the Water Flow Test the engine was noticed to detonate at all speeds up to 2600 R.P.M. The compression ratio of the engine is slightly higher than was at first intended and is 5.92:1 We have not been able to carry out further tests yet as the engine has been removed from the test bed for examination and to be used for timing up the engine suspension in the chassis. RS{Sir Henry Royce's Secretary}/T. Atthews. Att: Print V.1462S. | ||