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).
The ignition timing setting for the turbulent head.
| Identifier | ExFiles\Box 14\3\ Scan014 | |
| Date | 31th May 1928 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} x7050 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}5/LG31.5.28. TURBULENT HEAD. x7060 The ignition setting on the turbulent head is 10° later than on the cast iron head. The flywheel marking for the timing with the hand control in the fully advanced position is therefore 10° B.T.D.C. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||