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 Zenith Carburetter Type 48VI-2 specifications for standard and supercharged applications.
| Identifier | ExFiles\Box 122\1\ scan0207 | |
| Date | 19th June 1935 | |
| X1034 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation} Hs{Lord Ernest Hives - Chair}/GR.{George Ratcliffe}6/KW.19.6.35. Zenith Carburetter, Type 48VI-2. Specification as removed from 18-G-IV. Choke 36 m/m.{Mr Moon / Mr Moore} Main Jet 165 Comp. Jet 150 Slow run. 70 Capacity Tube No.1. Economy Nil. Ventilation 4 m/m.{Mr Moon / Mr Moore} Seating 2.5 m/m.{Mr Moon / Mr Moore} Specification as fitted to 3-B-IV (supercharged). Choke 36 m/m.{Mr Moon / Mr Moore} Main Jet 210 Comp. Jet 165 Slow run. 70 Capacity Tube No.1. Economy 180. Ventilation 4 m/m.{Mr Moon / Mr Moore} Seating 4 m/m.{Mr Moon / Mr Moore} Low speed passage diameter increased from .035" to .062" (section opposite emulsion block). This passage supplies both idling and progression holes. On 3-B-IV, supercharged, it was found necessary to fit 210 main jet and 4 m/m.{Mr Moon / Mr Moore} seating to overcome starvation and weakness above 90 m.p.h. Petrol consumptions 12.33 m.p.g./ 50 m.p.h./ 70 miles. 15.24 m.p.g./ 40 m.p.h./ 70 miles. Hs{Lord Ernest Hives - Chair}/G.Ratcliffe. | ||