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).
Comparing the engine detonation properties of BP, Shell, and Pratts petrol.
| Identifier | ExFiles\Box 20\6\ Scan083 | |
| Date | 29th June 1925 | |
| To Wor.{Arthur Wormald - General Works Manager} from Hs.{Lord Ernest Hives - Chair} x985 Hs{Lord Ernest Hives - Chair}3/LG29.6.25. Petrol and Engine Detonations. Referring to Brl/H27.6.25 attached. We agree, from our general experience, that 'BP' petrol is worse for detonation than 'Shell'. We have not had much experience with 'Pratts'. It is difficult to lay down any fixed value for any petrol with regard to detonation because it can so easily change. On the whole we have found that the 'Shell' people do intelligently blend their petrols so as to reduce the tendency for detonation. We should not think it can be proved that the fact that the petrol filter was green and corroded, the fuel was poor. We think the way 'N' are dealing with customers using 'BP' petrol is the most satisfactory i.e., we prove to them their complaint of detonation is overcome if they use one of the other well-known brands of petrol. Hs.{Lord Ernest Hives - Chair} | ||