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 power at road wheels for a Solex Twin Choke Carburetter versus an RR Carburetter on a Phantom II.
| Identifier | ExFiles\Box 13\3\ 03-page190 | |
| Date | 22th January 1930 | |
| SOLEX TWIN CHOKE CARBURRETTTER ON PHANTOM II POWER AT ROAD WHEELS ( 32MM CHOKES IN SOLEX CARBURRETTER ) IGNITION TIMING. MAG. 18° B.T.D.C. BATTY. 12° B.T.D.C. CUT-OUT CLOSED. CHASSIS N° 19 Ex. ROAD WHEEL B.H.P. ENGINE R.P.M. RR. CARBURRETTER 19 Ex. SOLEX 22-1-30 | ||