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 exhaust manifold performance against piston displacement for crank angles.
| Identifier | WestWitteringFiles\K\September1923\ Scan64 | |
| Date | 17th September 1923 | |
| RR 495A (1H) (SL11D 17-9-23) MP 270910B G.V. Spring Used—Rating Diagram Area Engine Cyl. No. Air. Temp. Bar Temp. Cooling Water Temp. R.P.M. Lbs. Lift H.P. I.M.E.P. B.M.E.P. Max. Expl. Pr.{Percy H. Rose} Av. Expl. Pr.{Percy H. Rose} Mechanical Efficiency Indicated Vol. Efficiency H.Q 1" = 6.2 lbs/sq" T.D.C. EXHAUST MANIFOLD ON EXHAUST MANIFOLD OFF ATMOS. PR.{Percy H. Rose} LINE PISTON DISPLACEMENT FOR CRANK ANGLES | ||