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 and specification report covering clutch, brakes, engine, and suspension.
| Identifier | Morton\M4.1\ img016 | |
| Date | 10th December 1920 | |
| -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. Distance. 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.80m/m 3 5/32" Stroke.140m/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 3/8" 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 Timing M.L. Magneto only. Full retard 10° P.T.D.C. Full advance 10° B.T.D.C. order of firing 1, 2, 4, 3. Contd. R.R. 238A (100) (S.H. 198, 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 | ||