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 comparing intake manifold pressure and vacuum against engine RPM for supercharged and non-supercharged engines.
| Identifier | ExFiles\Box 173\3\ img045 | |
| Date | 1st April 1934 guessed | |
| INTAKE MANIFOLD PRESSURE 3 1/4 X 4 SUPERCHARGED ENGINE RATIO SUPERCHARGER TO CRANKSHAFT 5.26 : 1 PRESSURE ATMOSPHERE LINE VACUUM INTAKE MANIFOLD VACUUM 3 1/4 X 4 ENGINE NOT SUPERCHARGED CARBURETOR VACUUM 3 1/4 x 4 SUPERCHARGED ENGINE Y-AXIS: INCHES OF MERCURY X-AXIS: ENGINE R.P.M. | ||