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).
Graph showing the delivery curve of a vacuum pump for a Super Sports engine after modification.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan061 | |
| Date | 7th September 1928 | |
| V414 VACUUM PUMP (SUPER SPORTS ENGINE). DELIVERY CURVE OF PUMP AFTER MODIFICATION TO V413. DELIVERY (PINTS PER HOUR). R.P.M. OF ENGINE. FUEL DELIVERY BY PUMP THRO' STANDARD AUTO-VAC. FUEL DELIVERY REQUIRED BY ENGINE (FULL THROTTLE). | ||