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).
Improvements to pump efficiency, autovac suction, and lubrication of ignition and dynamo components.
| Identifier | ExFiles\Box 40\4\ Scan285 | |
| Date | 4th September 1928 guessed | |
| contd : -2- effective stroke of the pump. We think the efficiency of the pump would be increased if the ports were arranged so that the suction port registered with the piston port when at the bottom of the stroke and the outlet port did not become uncovered by the top of the piston. By placing the suction port at the end of the piston travel where the piston velocity is lowest, we should allow more time for the cyl. to fill up at the higher speeds. The suction readings given on the print were taken with the suction gauge connected directly with the pump. Actually when operating the autovac much less suction was recorded due to the displaced air being followed by the petrol. We have experienced no further trouble with oil building up in the ignition govenor casing since adding the extra drain grooves as mentioned in our previous report. The lubrication of the dynamo drive bush has also been so far satisfactory since adding the extra oil deflector and grooving the bush. hs{Lord Ernest Hives - Chair}/A.{Mr Adams} C. Lovesey. | ||