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).
Comparative tests of water loss from a car's radiator under boiling conditions.
| Identifier | ExFiles\Box 38\2\ Scan177 | |
| Date | 12th August 1922 guessed | |
| contd:- -2- (4) A chimney type filler cap was used, as used on the Austrian Trials cars. We tried various means of making comparative tests. One condition was that the car was run on the dynamometer at full power at 1000 revs. the HP., petrol consumed and timing was kept constant for every test. The water was levelled up in the radiator for each test. We then ran the car for 5 mins. with the water boiling. We took four tests under each condition and averaged the results. We found with the standard car that under these conditions of boiling we lost on an average 4½ pints of water in 5 mins. Half of this was collected as water from the over-flow in the radiator, the other half went away in steam. The worst condition was with the large diameter top water pipe. With this under similar conditions, we collected three pints of water and lost 3¼ in steam, making a total of 6¼ pints. With the chimney filler cap we lost 1½ pints of water and 2¼ as steam. This shows a slight improvement over the standard, but not sufficient to warrant any change. The chief point brought out in these tests was, that it is possible to lose a considerable amount of water in steam, it all depends to what degree the water is boiling, for instance, if no fan is fitted, we can boil away in steam 26 pints of water in 20 mins. running full power. With the fan working but water still boiling, we lose only 1/3 of that amount in steam in the same time. HS.{Lord Ernest Hives - Chair} | ||