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 specifications and performance test results sheet, page 2.
| Identifier | ExFiles\Box 32\5\ Scan126 | |
| Date | 1st October 1920 | |
| Contd. -2- Foot Brake Side brake. Distance to pull up at - 20 M.P.H. 35 ft. 83 ft. Clutch out - brake hard on 30 M.P.H. 84 ft. 238 ft. 40 M.P.H. 112 ft. 668 ft. Engine Valve timing. I.O. 12º B.T.D.C. ) I.C. 70º P.B.D.C. ) .002" E.O. 26º B.B.D.C. ) clearance. E.C. 27º B.T.D.C. ) Bore of cylinder 3¾" Stroke 5½" Valve Lift - Inlet .434" Exhaust .443" dia. of port 1.843" Compression. No.5 78 lbs. No.3 77 lbs. Cu. capacity 16¾ sq.in. Vacuum in Induction Pipe. Springing. Rear - two eliptic springs across rear attached to brake bracket. Front - Two Eliptic springs front axle fastened front of centre. 4 Hartford Shock Absorbers fitted - 2 front and 2 rear working crossways. 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 M.P.H. " " " 45 M.P.H. " leaves the 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 full retarded - 10ºP.T.D.C. advanced - 17º B.T.D.C. automatic governor. - Full advanced on Governor 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. Friction on pivots 8 lbs. required first initial pull from full lock. 5¼ lbs. from centre. Dia. of circle to turn Car - Right hand turn 48 ft. 6 ins. Left hand turn 49 ft. 6 ins. Length from centre of sphere to centre of axle - 72¼". Contd. | ||