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).
Engine cooling circulation and water temperature tests with speed.
| Identifier | ExFiles\Box 29\3\ Scan224 | |
| Date | 9th July 1930 | |
| HS{Lord Ernest Hives - Chair}/RML/AU9.7.30 contd. -5- CIRCULATION. We conducted tests on the track restricting the circulation until the system lost efficiency to the extent of about 2°C. top water temperature. The flow under these conditions is shewn in Graph lllb. It will be observed from Graph lllc. that the flow with the unrestricted standard system does not fall below the figure required for normal cooling until a bottom water temperature of 88°C. is attained which corresponds to a top water temperature approaching boiling. However, a slight obstruction in the matrix would undoubtedly impair the circulation at the higher temperatures. INCREASE OF MAXIMUM WATER TEMPERATURE WITH SPEED. Graph lb. shews the increase of water temperature with speed. The car runs approximately 6°C. hotter at 75 M.P.H. than at 60 M.P.H. Naturally the car is more likely to suffer from weak mixture when being driven all out, which may make the apparent difference greater than this figure. It is hardly fair to congratulate the American Phantom I car on not over-heating at 71 M.P.H. when we know that our own cars would be better cooled at similar speeds under similar conditions, and only get into trouble because they can develop considerably more power and do 14 M.P.H. more speed. SUMMARY. It will be seen from Graph III that given an | ||