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).
Performance comparison graph for 120° and 114° camshafts.
| Identifier | ExFiles\Box 13\2\ 02-page131 | |
| Date | 21th August 1931 | |
| COMPARISON W.W. 120° & 114° CAMSHAFTS. RM{William Robotham - Chief Engineer} P18 21/8/31 4.75 CR{Mr Cra???ster / Mr Chichester} PD UNIT ① I.O. 3° B.T.C E.O. 54° B.B.C. CLAUDEL I.C. 58° A.B.C. E.C. 12° A.T.C. E82448 ② I.O. 2.5 P.T.C. E.O. 63.2 B.B.C. CLAUDEL I.C. 60.3 A.B.C E.C. 4.5 P.T.C. ③ AS ① BUT TWIN CHOKE CARB TIMING 7° EARLIER CAM FORMS LEC. 2918 INLET LIFT .470 EX LIFT .460 ① 114° SHAFT ② 120° SHAFT B.H.P. R P M B.M.E.P. INDUCTION DEPN INS HG INLET THROAT DIA. 2.0" TWIN CARBS CLAUDEL SEP 31 | ||