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).
Page showing boiling points and engine temperature data tables.
| Identifier | ExFiles\Box 38\2\ Scan196 | |
| Date | 18th July 1923 | |
| R.R. 405A (40 H) (SL 12 18-7-23). J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. REF: determined by the venturi meter, remaining normal up to the increased boiling point. Afterwards a reduction in flow occured, 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 oC | | :--- | :--- | :--- | | 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 oC. | Eng. outlet water. temp. to oC. | Average eng. temp. oC. | Gauge pressure, lbs./sq.in. | | :--- | :--- | :--- | :--- | :--- | | 500 | 62.25 | 110 | 86.1 | 3 | | 1000 | 97.75 | 111.5 | 104.6 | 3 | | 1250 | 99.5 | 114.5 | 107 | 10 | Boiling | 1500 | 100.75 | 115.5 | 108.1 | 10 | Boiling The increase of average temperature above that at which engine normally runs was accompanied by slight decrease of power. contd:- | ||