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).
Resolving pre-ignition and over-heating, comparing radiator matrixes and bottom outlets.
| Identifier | ExFiles\Box 24\5\ Scan261 | |
| Date | 9th July 1930 | |
| -4- Hs{Lord Ernest Hives - Chair}/Rml/MJ9.7.30 contd. pre-ignition and over-heating. The simplest way of overcoming this is to run on the reserve. This trebles the period of full throttle work before shortage takes place. The larger drop valve to the autovac which is being standardised, improves the fuel supply appreciably. We think the fuel supply troubles may have affected some of the tests given in Hs{Lord Ernest Hives - Chair}/Rml/MJ25.6.30. COMPARISON OF RADIATOR MATRIXES. We compared the standard 6 mm. 7¼ mm. tubes with a radiator built up with 5¼ mm. 7 mm. tubes. The tubes were conducted at 60 M.P.H. and 75 M.P.H. and confirm that there is very little to choose between the two tube sizes. The present standard tube appears to be slightly the better of the two. COMPARISON OF RADIATOR BOTTOM OUTLETS. We tried using simultaneously, outlets at each side of the bottom tank with a view to improving the distribution of water flow through the radiator. We were able to detect an improvement of 1¼°C. by using both outlets but as this is less than manufacturing differences we get between similar radiators, it is not worth very much. However, a double outlet improves the circulation at high temperatures (Graph 111C) where we have little to spare. | ||