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).
Technical specifications and performance report covering clutch, brakes, engine timing, suspension and ignition.
| Identifier | ExFiles\Box 126\2\ scan0012 | |
| Date | 10th December 1920 guessed | |
| -2- Clutch. Leather cone - clutch sticks in - slips badly, no jaggers, easy to change gears. BRAKES. Foot brake - band lined with Ferodo, situated rear of gear box - jaggers very badly when pulling up hard. Hand brake - rear wheels - very smooth in action - good breaking action. Distance to pull up (with clutch out, brakes hard on.) M.P.H. | Foot Brake. | Hand brake. 20 | 38 ft. 6 ins. | 33 ft. 30 | 86 ft. | 95 ft. 40 | 161 ft. | 162 ft. Engine Valve Timing. I.O. T.D.C. I.C. 40° P.B.D.C. period of induction 220° E.O. 60° B.B.D.C. .002" clearance. E.C. 20° P.T.D.C. period of exhaust 260° Bore and stroke of cylinder. Bore 80 m/m 3 5/32". Stroke 140 m/m 5.5" Valve Lift. Inlet .318" Exhaust .314" Compression. No. 1 87 lbs. Cu. capacity No.1 10 cu.ins. No. 3 90 lbs. No. 3 10 cu.ins. Vacuum in Induction Pipe. 15/16" mercury at 1000 R.P.M. full throttle. Springing. No shock absorbers - semi elliptic springs, rear and front. Front springs require damping - too bouncy. Length 35.5 ins. centre 1 1/8" cambre - 8 leaves - rolled eye. Rear springing very fair - would be improved by damping - over-slung - torque taken by springs 47" centre 2.25" cambre - 11 leaves - rolled eye. Ignition. M.L. Magneto only. Timing. Full retard 10° P.T.D.C. Full advance 10° B.T.D.C. Order of firing 1, 2, 4, 3 Contd. | ||