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).
Requesting information on optimal ignition advance settings for various engine speeds to prevent backfiring.
| Identifier | ExFiles\Box 37\1\ scan 221 | |
| Date | 22th September 1920 | |
| X 3949 To Hs.{Lord Ernest Hives - Chair} from EFC. EFC6/T22.9.20. X.3775 - SPECIAL IGNITION COILS. X 3949 I would like to draw your attention to the paragraph in M3/G20.4.20 addressed to me, which reads as follows :- "I am now anxious to learn from Mr. Hives what he considers the best advance (after starting from a retarded position) for various speeds, i.e. (1) What is a retarded position which is sufficiently safe to prevent any risk of back firing? (2) The advanced position for the slowest speed of engine that we are likely to require, such as very hard pulling say, 500 revs. then the extra advance necessary from 500 to 1000, and 1000 to 2000, 2000 to 3000.? Perhaps you could help to get this information recorded, preferably for an engine like the "Hawk" and our present car engine. This information is wanted for automatic advance". EFC. | ||