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).
Vehicle performance evaluation report covering clutch, brakes, engine, suspension, ignition, and steering.
| Identifier | ExFiles\Box 32\5\ Scan142 | |
| Date | 16th December 1920 | |
| 16.12.20. Clutch.- ease of changing - 1st. to 2nd. gear - clings a bit. Others all O.K. - no double clutch required. No squeaks - picks up smoothly. Brakes.- No jaggers. Foot brake - good but spongy. Side brake - very poor. Distance to pull up at (clutch out - brake hard on) Front brake. Side brake 20 M.P.H. 35 ft. 83 ft. 30 M.P.H. 84 ft. 238 ft. 40 M.P.H. 112 ft. 658 ft. Engine Valve Timing. I.O. 12º B.T.D.C. } I.C. 70º P.B.D.C. } .002" clearance. E.O. 26º B.B.D.C. } E.C. 27º P.T.D.C. } Bore of cylinder. 3¾" - stroke 5¼" Valve Lift. Inlet .434" Exhaust .443" dia. of port 1.843". Compression. No.5 76 lbs. No.3 77 lbs. cu. capacity 16¾ cu. ins. vacuum in Induction Pipe. Springing. Rear - two elliptic springs across rear attached to brake. Front- Two elliptic springs front axle, fastened front of centre. 4 Hartford shock absorbers fitted - 2 front and 2 rear. working corssways. Friction on rear shock absorbers - 21 lbs. - friction by steel and wood. Tests over bump on road - 20 M.P.H. Car holds road. 30 M.P.H. " " " 40 MP. H.{Arthur M. Hanbury - Head Complaints} " " " 45 M.P.H. " leaves road and throws passengers. Without shock absorbers car does not hold road so well but is more flexible over granite roads - front springing bad. Ignition. Delco coil only - Timing fully retarded 10º P.T.D.C. Advanced 17º B.T.D.C. auto-governor. Full advanced on Gaven: 42º B.T.D.C. Order of firing 1, 5, 3, 6, 2, 4. Steering. Reversible - not self centering. Road shock on steering wheel very bad - no wobbles. Contd. | ||