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 graph showing Brake Horsepower and Road Wheel HP against Engine RPM for an experimental aluminium engine.
| Identifier | ExFiles\Box 71\1\ scan0315 | |
| Date | 7th September 1927 | |
| 10 EX. ALUM ENGINE COMP. RAT. 4.95-1 STANDARD INDUCTION AND EXHAUST LONG DURATION CAMSHAFT TURBULENT HEAD Graph: Vertical Axis: B.H.P. Horizontal Axis: ENGINE R.P.M. Upper Curve: B.H.P. CO. OPEN Lower Curve: ROAD WHEEL H.P. CO. OPEN Top Scale: 50 60 70 80 90 17 TOOTH M.P.H. 50 60 70 80 90 16 TOOTH M.P.H. Bottom Scale: 50 60 70 80 90 16 TOOTH M.P.H. Data Tables: ROAD SPEED ENGINE REV. M.P.H. 16x52 17x52 80 2600 2450 70 2278 2140 60 1950 1835 50 1670 1580 40 1310 1228 30 978 920 20 653 613 AVERAGE PRODUCTION FIGURE % LOSS TO ROAD WHEELS. 2750 38% 2500 28% 2250 22% 2000 22% 1500 20% 500 15% AS ABOVE LOSS AT VARIOUS ROAD SPEEDS. M.P.H. % LOSS 80 35% 70 27% 60 22.5% DIFFERENCE IN H.P. AT ROAD WHEELS AVAILABLE. 16 & 17 TOOTH AXLE. M.P.H. % GAIN 17x52 90 10.5% 80 4.5% 70 2% Stamp: ROLLS-ROYCE, LIMITED PRINT ROOM 7 SEP 1927 | ||