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).
Carburetter operation with two illustrative diagrams.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan080 | |
| Date | 28th January 1929 guessed | |
| contd :- -8- 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 depress- ion 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 ¼" 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 diagramm- atic for indicates how the straight through form of carb. - giving better pressure restoration and less contd. Fig. 6. DIAPHRAGM LIFTS JUST AS MAIN DIFFUSER STARTS TO DELIVER THROTTLE OPENED MORE. VEL THRO' HIGH-SPEED CHOKE DRAWS FUEL FROM DIFFUSER. PISTON ADJ'D TO LIFT AT THIS DEPN METHOD OF ARRANGING FOR "STRAIGHT THROUGH" TYPE OF CARB. Fig 7. | ||