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).
Page explaining carburetter depression and operation, with two illustrative diagrams.
| Identifier | ExFiles\Box 121\2\ scan0085 | |
| Date | 23th January 1929 guessed | |
| -8- contd :- valve reached its maximum lift, the depression in the high speed choke would however vary in exactly the same way as a static carburetter. The depression to operate the piston - which is simply there to give us the pressure difference across the idling system at low engine speeds - could be arranged to be less than 1/4" mercury (so we estimate) consequently the carburetter would operate at a much slower depression than the Phantom. The sketch shewn merely indicates the disposition of the parts for clearness and a carb. working on this principle could assume the form shewn in the next sketch which would possess several advantages over the elemental form shewn above. Again this sketch is only diagrammatic for indicates how the straight through form of carb. - giving better pressure xxxxx restoration and less contd :- FIG. 6. DIAPHRAGM STARTS TO LIFT JUST AS MAIN DIFFUSER STARTS TO DELIVER. THROTTLE OPENED MORE VEL. THRO' HIGH SPEED CHOKE DRAWS FUEL FROM DIFFUSER. PISTON ADJ. TO LIFT AT THIS DEPN. FIG. 7. METHOD OF ARRANGING FOR "STRAIGHT THROUGH" TYPE OF CARB. | ||