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).
Carburettor main jet standardisation for the Phantom III.
| Identifier | ExFiles\Box 93\2\ scan0225 | |
| Date | 13th February 1938 | |
| To By.{R.W. Bailey - Chief Engineer} c. to Mx.{John H Maddocks - Chief Proving Officer} 308 Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe}7/JH.13.2.38. PHANTOM III CARBURETTOR - SECTION 5080. With reference to memo. Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe}13/MH.{M. Huckerby}12.11.37. it was recommended that smaller main jets .056 should be standardised. These are now revoked if the bias tilt to the carburettor is adopted. The following cars were fitted with the carburettor having a forward tilt of 4½°. 3.BU.122. Petrol pumps : low pressure on dashboard. 3.BU.190 - - - - 3.CP.30 - - - - 3.CM.87 - - : high pressure in frame. The fuel level in each case was not altered and when tilted gave .750" as compared with .625" normal. In order to maintain performance the existing main jets .058 were retained. Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe} | ||