Blueprint chart of a Bentley III engine showing power and detonation characteristics against RPM and ignition advance.
| Identifier | ExFiles\Box 99\1\ scan0027 | |
| Date | 1st July 1938 | |
| BENTLEY III; POWER & DETONATION; S.51.; JULY. 1938.; UNIT. B.3. No: 1; INTAKE AIR TEMP.; COMP. RATIO 7:1 (E.W.1296) (100 OFF FACE); IN. VALVE 1-60 E.W.1429; EX. VALVE 1-40 E.61299; PISTONS R.M. 522 ("T.I"); CAP. 119ccs.; ① INLET AIR TEMP. : 25°C.; ② INLET AIR TEMP. : 55°C.; ⓐ MIN. ADV. FOR MAX. POWER.; ⓑ LINE TO AVOID DETONATION.; "REDLINE" PETROL (No 3); TEST BED EXH: SILENCER.; B.M.E.P.; IGNITION ADVANCE; DEGREES B.T.D.C; R.P.M.; C.T.S. | ||
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).