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).
Recent engine detonation issues in repaired cars, likely caused by petrol quality.
| Identifier | ExFiles\Box 50\2\ Scan070 | |
| Date | 20th October 1921 | |
| R.R. 235c (10 T) (S.J 194.9-6-21). X4295 To R.{Sir Henry Royce} from Hm.{Capt. W. Hallam - Head Repairs} Copy to BJ. " " EH. " " HS.{Lord Ernest Hives - Chair} " " MF. Hm{Capt. W. Hallam - Head Repairs}3/W20.10.21. X4295 R1/G18/10/21. x612 With reference to the second paragraph of the above memorandum, detonations have been more noticeable recently (probably for three months) on repaired cars. We have formed the opinion that this is caused by some difference in the quality of petrol during this period. Customers have informed us of distinct detonations after 1,000 miles running, which has affected the power of their cars on hills, and on examination the amount of carbon found is only what one would expect after 1,000 miles. Hm.{Capt. W. Hallam - Head Repairs} | ||