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).
Cooling system tests conducted on the Montlhéry track in France.
| Identifier | ExFiles\Box 11\3\ 03-page216 | |
| Date | 19th July 1930 | |
| To: Hs.{Lord Ernest Hives - Chair} From G.W.H. Hôtel de France, Châteauroux, Indre. 19/7/30. We sent you a report yesterday re tests taken on the Montlhéry track. The special Autovac sent out was fitted before proceeding with these tests. The figures given in the tests were taken when the temperatures were consistent; in some cases seven laps were run to obtain the figures. Immediately the figures showed signs of being consistent, the readings for the next three consecutive laps were recorded. During the morning's run, rain was falling most of the time. On the chart that we are sending to you, we give No. 6 test which is identical to No. 9 test. No. 9 test was taken to obtain a standard reading upon starting the afternoon's tests. It so turned out to be identical in temperature with the No. 6. We believe that the results of these tests give valuable information what is wrong with the cooling system on 24-EX. This car 24-EX is no worse, as far as we know, than what other Phantoms have been when run under the same conditions, but it is a fair example of what is happening to all R.R. cars run over in France that are complained of by customers. The tests show clearly that at the maximum speed of the car, although the radiator is performing its duty with regard to the top and bottom water temperatures, the extra heat units supplied by the engine are more than the radiator is capable of dealing with. A very good example of this occured during the No. 5 test, when a very heavy rain storm came on, with the result that the top water temperature dropped from 87.5°C. to 79.5°C., a corresponding drop also taking place in the bottom | ||