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 results for engine cooling performance, with tables for boiling points at different pressures and temperatures at various speeds.
| Identifier | ExFiles\Box 38\2\ Scan254 | |
| Date | 14th September 1923 guessed | |
| contd :- -2- determined by the venturi meter, remaining normal up to the increased boiling point. Afterwards a reduction in flow occurred, similar to that experienced without the pressure system. The following table gives approx. the boiling points corresponding to different pressures :- Abs. press: lbs.sq.in. | Gauge press: lbs.sq.in. | Boiling point °C. 14.7 | 0 | 100 17.5 | 2.8 | 105 18.7 | 4 | 107.6 20.7 | 6 | 110 Test 2. Temperature and pressure at various speeds, full load with fan working. R.P.M. | Eng.inlet water temp. to °C. | Eng.outlet water temp. to °C. | Average eng.temp: °C. | Gauge pressure. lbs.sq.in. 500 | 62.25 | 110 | 86.1 | 8 1000 | 97.75 | 111.5 | 104.6 | 8 1250 | 99.5 | 114.5 | 107 | 10 ) Boil- 1500 | 100.75 | 115.5 | 108.1 | 10 ) ing The increase of average temp. above that at which the engine normally runs was accompanied by slight decrease of power. contd :- | ||