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).
Blueprint showing a bump crown piston design for a ramp head, with associated combustion chamber performance charts.
| Identifier | ExFiles\Box 127\4\ scan0117 | |
| Date | 7th April 1938 | |
| THIS DIMENSION AS ON No2 HEAD, WHICH HAS BEEN RUN. SECTION A-A INLET VALVE 1.600 DIA EXHAUST VALVE 1.375 DIA SCALE 1/1 BUMP CROWN PISTON FOR RAMP HEAD THE CYL. HEAD IS E.B.1616 MODIFIED BY MACHINING TO DIMENSIONS SHOWN. Mitchell 1-11-38 COMBUSTION CHAMBER CHART No2 CR{Mr Cra???ster / Mr Chichester} 7.1 : 1 CURVE FOR A SMOOTH ENGINE SHOULD LIE WITHIN RED AREA WHICH IS AS DETERMINED BY ALEX. TAUB. RATIO { PERCENTAGE VOLUME INCREASE / PERCENTAGE TRAVEL INCREASE } FLAME VOLUME PER CENT. FLAME TRAVEL PER CENT. ROLLS-ROYCE, LTD. PRINT ROOM 7 APR 1938 DERBY. PD.140 | ||