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 comparison graph for Turbulent and Standard cylinder heads on a Peregrine engine.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page230 | |
| Date | 4th October 1932 guessed | |
| COMPRARISON OF TURBULENT AND NON TURBULENT HEAD PEREGRINE SINGLE 1 5/8 S.U. 6.27 C/R CAMSHAFT TO FORMS Le C 3223 OPEN EXHAUST SMALL INLET VALVES 1.125 THROAT BOTH HEADS A TURBULENT HEAD Le C 3222 B STANDARD HEAD Rm{William Robotham - Chief Engineer} PR 33 B.H.P R.P.M. B.M.E.P. INDUCTION DEPN INS HG 107° SHAFT E100863 Ex IN .020 8 5 34 42 | ||