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).
Power comparison graph showing B.HP at the flywheel against road speed for different engine configurations.
| Identifier | ExFiles\Box 30\2\ Scan076 | |
| Date | 30th January 1932 | |
| 30/1/32 POWER COMPARISONS - B.H.P. AT FLYWHEEL AGAINST R.P.M. (OPEN EXHAUST) GEAR RATIOS:- ① STD PII 60 M.P.H.= 2315 R.P.M. ② STD PII 60 M.P.H.= 2315 R.P.M. ③ STD PII 60 M.P.H.= 2315 R.P.M. ④ STD 25H.P. 60 M.P.H.= 3018 R.P.M. ⑤ 60 M.P.H.= 2700 R.P.M. 100 M.P.H.= 4500 R.P.M. KEY: ① STD PHANTOM II - 7668 cc ② CONTINENTAL PII (RR SEMI EXP CARBS: R: 5.25:1) - 7668 cc ③ CONTINENTAL PII (TWIN S.U. CARBS: R: 5.25:1) - 7668 cc ④ 12 CYL: 3 x 4.5 J1 ENGINE (TWIN S.U. CARBS: R: 6.3:1) - 6252 cc (112° CAMSHAFT) ⑤ 12 CYL: 3.25 x 4.5 J1 ENGINE (TWIN S.U. CARBS: R: 6.3:1) - 7338 cc (112° CAMSHAFT R=6.3:1) AXIS LABELS: Y-AXIS: B.H.P. (FLYWHEEL) X-AXIS: ROAD SPEED M.P.H. | ||