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 from a Bentley single-cylinder engine test showing power output with a large inlet valve (Nº 2 Ramp Head).
| Identifier | ExFiles\Box 133\2\ scan0089 | |
| Date | 5th January 1944 guessed | |
| Nº BENTLEY SINGLE CYLINDER TESTS. SHEET 6 POWER OUTPUT WITH LARGE INLET VALVE, (Nº 2 RAMP HEAD) Nº 2 RAMP HEAD (LEC 3871) INLET VALVE = 1.600 DIA. NATURALLY ASPIRATED ZENITH TRIPLE DIFFUSER CARBURETTOR (32 M/M CHOKE) OPEN EXHAUST COMPRESSION RATIO = 6.5 EXHAUST VALVE = 1.400 DIA. AEROLITE PISTON FUEL = DTD 224 TIMED TO GIVE MAXIMUM POWER AT 2000 RPM, BUT OVERLAP LIMITED TO 12º TIMED TO GIVE MAXIMUM POWER AT 3000 RPM, BUT OVERLAP LIMITED TO 12º DITTO, BUT WITH NO LIMIT TO OVERLAP Y-AXIS LEFT: BRAKE HORSE POWER X-AXIS BOTTOM: RPM Y-AXIS RIGHT TOP: B.M.E.P. (LBS/SQ. IN.) Y-AXIS RIGHT BOTTOM: SP.{Mr Spinney} FUEL CONS. (PTS/BHP/HR) | ||