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).
List of octane values for various commercially available fuels tested on an S.30 engine.
| Identifier | ExFiles\Box 32\1\ Scan123 | |
| Date | 24th March 1933 | |
| OCTANE VALUES FOR FUELS OBTAINABLE FROM PUMPS - MARCH 24th/1933. Ethyl. 73-74. B.P. Plus. 72-73 High Test. 68 100°C Test. 600 Revs } S.30 Engine. Shell 68-70 Shell Mex. 64-66 Pratts Commercial 64-66. D.T.D.134 = 75.5 - 76 Octane. 100°C at 900 R.P.M. Esso 78 Dynamin Dud Azur. 73 (Stanavo 73 at 150°C at 600 R.P.M.) X/S.S.5 | ||