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 detailing an engine performance graph and specifications for a Bentley 4-B IV chassis.
| Identifier | ExFiles\Box 155\1\ scan0099 | |
| Date | 24th June 1933 | |
| BENTLEY CHASSIS - 4 - B IV (UNIT B. N°3) GEAR BOX TO N. SCH. 3658 11/41 REAR AXLE IGNITION SETTING 13° B.T.D.C (LEC. 3522) EXHAUST CUT OUT (LEC 3441) OPEN SPEEDS UP TO & INCLUDING 2500 R.P.M IN TOP GEAR 3000 R.P.M IN 3RD GEAR 3250 R.P.M UPWARDS IN 2ND GEAR B.H.P. AT ROAD WHEELS ENGINE R.P.M. BROOKLANDS LAP SPEED (Cut Out Open) 85MPH VALVE TIMING .020 CLEARANCE IO 18° PTDC EIC 12.7° PTDC IC 58.7° PBDC EO 43.7° B.B.C UNIT-B- N°3 CAMSHAFT - 113° - Lec. 3292 - E.B. 318 PISTONS E.B. 495 (LONG SKIRT) CYLINDER BLOCK E.B. 89 CYLINDER HEAD E.B. 222 MODIFIED BY MACHIN'S 105 OFF JOINT FACE - 97cc COMBUSTᴺ CHAMBER THIN SHEET METAL GASKET. | ||