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 plotting Autovac petrol delivery against engine RPM in a series of comparison tests on a 20HP engine.
| Identifier | ExFiles\Box 40\4\ Scan216 | |
| Date | 8th February 1927 guessed | |
| INDUCTION PIPE DEPRESSION (IN. MERCURY) FIG I AUTOVAC COMPARISON TESTS. 20 H.P. ENGINE No 110 III. STANDARD INDUCTION SYSTEM. TESTS AT FULL THROTTLE. PETROL LIFTED 32" THROUGH A PLAIN PIPE .250" BORE AND 6FT LONG AUTOVAC PETROL DELIVERY PTS/HR ENGINE R.P.M. NO DELIVERY BELOW 1500 R.P.M. AUTOVAC WITH MOVING FLOAT. MEASURING AUTOVAC. STANDARD AUTOVAC MEASURING AUTOVAC WITHOUT PETROL VALVE. | ||