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).
Graph of Benzol response curves, plotting Octane Number against the percentage of Benzol by volume for various fuel standards.
| Identifier | ExFiles\Box 150\1\ scan0071 | |
| Date | 1st October 1935 | |
| BENZOL RESPONSE CURVES VERY APPROX. COMPRESSION RATIOS PERMISSIBLE ON BENTLEY FOR EQUAL FREEDOM FROM DETONATION ON GIVEN FUEL OCTANE NUMBER 7-1 6 1/2-1 6-1 5 3/4-1 C.F.R. MOTOR METHOD OCTANE NUMBER 82 81 80 - ETHYL, ENGLISH STANDARD 79 78 77 76 - PREVIOUS ETHYL STANDARD 75 74 73 72 71 - No 1 GRADES 'BENZOL MIXTURES' 70 69 68 - No 3 GRADES 67 66 PRESENT FRENCH STANDARD BENZOL IN A CURRENT ETHYL PETROL APPROXIMATE RESPONSE IN A 76 OCTANE ETHYL PETROL PERCENT BY VOLUME OF 90'S BENZOL 10% 20% 30% 40% 50% 60% ETHYL EXPORT CORPORATION OCTOBER 1935 | ||