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).
Comparison of ignition systems in cars 1 EX and 6 EX, noting performance and petrol consumption.
| Identifier | Morton\M22\ img185 | |
| Date | 24th August 1920 | |
| To H.C. from R.{Sir Henry Royce} Copy to C.J. " " WOR.{Arthur Wormald - General Works Manager} " " DA.{Bernard Day - Chassis Design} " " BY.{R.W. Bailey - Chief Engineer} " " EFC. " " M.{Mr Moon / Mr Moore} ORIGINAL. X.37636 X.39236 X.3129 7.699 RE IGNITION - 1 EX. COMPARED WITH 6 EX. The ignition on both these cars behaved perfectly, but I found that 6 EX. appeared to be much later than 1 EX. and I could not get a decent consumption on the former car until I habitually used the ignition as far advanced as possible. Though the late arrangement of the ignition gives a good impression of smoothness of the engine, we fear that there would naturally lead to a very considerable increase in petrol consumption. Perhaps you will investigate this point, and find out by testing the battery ignition, or magneto ignition, or both, with which the difference occurs, my impression being that in 6 EX. it is the magneto which is relatively late. R.{Sir Henry Royce} RECEIVED 24 AUG 1920 | ||