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).
Engine pinking, the use of different petrols, and using low-grade fuel in experimental cars to identify carburation faults.
| Identifier | ExFiles\Box 32\1\ Scan112 | |
| Date | 1st October 1929 | |
| To Wor.{Arthur Wormald - General Works Manager} from Hs.{Lord Ernest Hives - Chair} X1555. Hs{Lord Ernest Hives - Chair}7/ADL.10.29. With reference to attached we are aware that certain brands of petrol have different anti-detonating values. Any complaint of exceptional pinking should first be dealt with by chnge of fuel. We consider that trials cars and customers' cars should run on the best fuel, but as regards experimental cars we have always used Shell Mex which is a low grade spirit. The reason for this is that it shows up any carburation fault quicker than the No.1 fuels. We consider the point raised by Br.{T. E. Bellringer - Repair Manager} as regards petrols is very important and we will carry out tests with B.P., Shell, Pratts etc. and send a Depot Sheet round giving results. HS.{Lord Ernest Hives - Chair} | ||