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).
List of desirable features and modifications for a carburetter system, page 2.
| Identifier | ExFiles\Box 42\3\ Scan081 | |
| Date | 22th January 1927 | |
| Contd. -2- Hs{Lord Ernest Hives - Chair}/ACLL/T22.1.27. 1. Diffuser or emulsion tube placed directly in the choke. 2. Choke giving free area past the diffuser of 1.905 sq." 3. Fore and aft float chambers so that a high petrol level can be used and be unaffected by tilting. (Strombergs have level .125" below spray holes. Latest models have the petrol level stamped on the carb.) 4. The two diffusers should be placed as close together as possible. There should be less variation of level or less tendency to flood when the machine is tilted sideways. 5. Idle running jet to become inoperative soon after main diffuser starts to meter. Supply for idling drawn from emulsion tube. 6. Smallest bore emulsion tube which will give the desired metering over the full throttle range. 7. Top of diffuser with sharp edge under spray holes to take up petrol at low velocities. 8. All jets arranged to ensure no leakage past sides so that size of orifice governs solely the supply. 9. With regard to the altitude control, we have not yet fully explored our present arrangement; at present it does not give us nearly enough range, but there should be no difficulty in overcoming this. We prefer the positive jet control similar to what we have used in our previous carburetters. Recent tests taken at the R.A.E. shew up the advantages with that system compared with the suction control. We have made very good progress with the alterations to the present carburetters in the Vee and we feel quite confident that with slight modifications which Contd. | ||