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 comparing different cylinder head configurations on a Peregrine engine with open exhaust.
| Identifier | ExFiles\Box 2\3\ B002_X 116 117 119 120-page46 | |
| Date | 28th January 1941 | |
| CYLINDER HEAD COMPARISON (PEREGRINE) HS.{Lord Ernest Hives - Chair}1046 CURVES TAKEN OPEN EXHAUST CAMSHAFT Hs.{Lord Ernest Hives - Chair}968 LARGE PEREGRINE CARBURRETTER ON INDUCTION PIPE TO E100058 EXCEPT THAT POCKET ABOVE RISER IS FILLED IN. SLEEVE FITTED IN INDUCTION PIPE TAPERING FROM 1.75" TO 1.90" DIA AND NEXT TO TOP OF PIPE. ① LARGE VALVE (1.90" DIA THROAT) TURBULENT HEAD. COMPRESSION RATIO 6.2:1 ② SMALL VALVE (1.75" DIA THROAT) NON-TURBULENT HEAD. COMPRESSION RATIO 6.2:1 ③ SMALL VALVE (1.75" DIA THROAT) TURBULENT HEAD. COMPRESSION RATIO 6.2:1 ④ LARGE VALVE (1.90" DIA THROAT) NON-TURBULENT HEAD. COMPRESSION RATIO 6.2:1 B.H.P B.M.E.P. (lb/sq.in) R.P.M. VALVE TIMING (ORO E100058) T.D.C 54° Exh Ind 34° R.A.H 28.1.41 | ||