Engine performance with 'commercial petrol' and a proposed new standard compression ratio.
| Identifier | ExFiles\Box 83\4\ scan0087 | |
| Date | 1st December 1935 | |
| S/W {Sales / Derby Works} To Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} from Sg. {Arthur F. Sidgreaves - MD} re B-56-BN. {W.O. Bentley / Mr Barrington} Sg {Arthur F. Sidgreaves - MD} 6/E3.12.35 Standard Petrol I should rather like to have the opportunity of trying this car when Hancock brings it back from France. I have not apparently tried a car with the compression ratio that we propose to standardise. I notice in Hancock's report of the 29th ult. he says: 'Power and acceleration not affected by use of commercial petrol. Detonations increased - ignition lever has to be half retarded to avoid them.' I am not clear what he means by 'commercial petrol'. Does he mean the same as we mean when we talk of commercial petrol in England, i.e. a lower grade petrol for use on commercial vehicles? Sg. {Arthur F. Sidgreaves - MD} | ||
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).