Performance graph of a Hispano engine, plotting pressure against crank angles.
| Identifier | ExFiles\Box 180\M4\M4.2\ img008 | |
| Date | 25th February 1923 | |
| 62 Spring Used—Rating 91.5 Diagram Area Engine HISPANO Cyl. No. 6 Air Temp. 12°C Bar Temp. 765 Cooling Water Temp. 80°C R.P.M. 2500 Lbs. Lift 108 H.P. I.M.E.P. 118 LBS/SQ B.M.E.P 88.2 Max. Expln. Pr. {Percy H. Rose} 350 Av. Expln. Pr. {Percy H. Rose} Mechanical Efficiency 74.5% Indicated Vol. Efficiency 88% DOTTED LINE SPRING RATING 6.2 LBS/SQ Graph Labels: EC TDC IO OVER ATMOS LINE IGNITION I.C. E.O. Bottom Axis: PISTON DISPLACEMENT FOR CRANK ANGLES. 0 10º 20º 30º 40º 50º 60º 70º 80º 90º 100º 110º 120º 130º 140º Left Margin (vertical): 62 - 25/2/23 | ||
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).