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).
Tests to prevent loss of water from the radiator due to boiling.
| Identifier | ExFiles\Box 24\4\ Scan099 | |
| Date | 21th August 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}1/LG21.8.23. TESTS TO PREVENT LOSS OF WATER DUE TO BOILING. A series of tests were taken with various schemes to try and prevent the excessive loss of water when the car boils. It was found very difficult to get a comparison because the amount of water lost depends upon to what degree the water is boiling. After trying several methods we found when running a car on the dynamometer under similar conditions and with a fixed load, gave us the most uniform results. The engine on the dynamometer was run at 1000 r.p.m. full throttle the whole time - the radiator was levelled up to the same level at 95°C - the test lasted for 5 mins. from when the water started to boil. A test taken with a glass tube placed between the radiator and the top water pipe showed that as soon as the steam was generated, pockets of steam came along at frequent intervals, sending water out of the radiator overflow until approximately a gallon of water had been forced out of the radiator either in steam or water - after that, the loss was practically all steam. The glass tube showed us that when steam was coming from the radiator, there was quite a distinct line of steam and water in the glass tube; steam in the upper half - water in the lower half of the tube. The following schemes were tried to prevent loss of water :- 1. A very large dia. top water pipe leading to the radiator (2" dia.) contd:- | ||