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).
Testing various spark plugs for over-oiling on the New Phantom model.
| Identifier | ExFiles\Box 72\1\ scan0085 | |
| Date | 12th June 1925 | |
| R.R. 403A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. +8980 REF. Hs{Lord Ernest Hives - Chair}/AJL1/LG101125 To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AJL. c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} Wor.{Arthur Wormald - General Works Manager} NEW PHANTOMCodename for PHANTOM I - OVER-OILING. We have carried out a series of tests in order to determine a value for various makes and types of sparking plugs, of their capacity for withstanding oil and sooting up. The following method of testing was followed :- The present standard Lodge non-detachable plug was chosen as a basis for comparison with other plugs; we call this therefore a 100% plug in respect of overoiling. 3 Lodge standard plugs were therefore put in an engine, sey in 1, 2 and 3 battery positions and 3 of another type in 4, 5 and 6 battery positions. The plugs were tested in battery positions owing to the fact that these plugs oil up quickest, being nearest the inlet valve and consequently cooler than the magneto plugs, which are nearest to the exhaust valve. The car was then run on the road and oil was admitted into the induction pipe. In order to produce an oily carbon deposit on the plugs, the car was run on a very strong mixture (obtained by opening the starter carb. valve slightly). The car was run under these conditions at betwen 10 and 20 m.p.h. until the plugs under test failed completely. By this means we were able to get an anti-oiling up value for any type of plug as compared with the present standard Lodge 'C' type non-detachable plug. In order to obtain a fair result the plugs were tested in every cyl. of the engine - the average contd :- | ||