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).
On ignition, confirming the old coil was insufficient for the high compression 20/25 HP engine.
| Identifier | ExFiles\Box 60\3\ Scan148 | |
| Date | 7th April 1932 | |
| PN.{Mr Northey} from Hs{Lord Ernest Hives - Chair}/Wst. C. Sg.{Arthur F. Sidgreaves - MD} C. E.{Mr Elliott - Chief Engineer} Rv. X6095 Hs{Lord Ernest Hives - Chair}/Wst.7/ADS.4.32. IGNITION - RE YOUR FNE/HTS.4.32. It is an experimental fact as you state, that the voltage to spark over a given plug gap increases considerably with pressure. When we recently standardised our new ignition coil we proved to our satisfaction that the old coil did not generate sufficient E.M.F. for the extreme conditions on the high compression 20/25 HP. engine. Hs{Lord Ernest Hives - Chair}/Wst. | ||