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).
Ignition timing and recommending opposed synchronised dual ignition for the new India engine.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan018 | |
| Date | 7th March 1928 guessed | |
| contd :- -4- any figures for ignition timing on the single wave turbulent type head - such as the side valve Ricardo head which is made for Fiat and Morris cars - but have heard they require very little advance and can operate efficiently on fixed ignition. The reason we lay emphasis on spark advance is that it has been our general experience that the tendency to detonate bears some ratio to the spark advance necessary. Another aspect of the desirability of obtaining the smallest ignition advance when using the turbulent type head is that the nearer the spark occurs to top dead centre the more compact is the combustion space with this head and the greater will be the turbulence, so tending to produce the best conditions for non-detonating. We should therefore recommend consideration of opposed synchronised dual ignition for the new India engine as we think opposed ignition and turbulent head should make a very good combination. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey. | ||