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 test report covering cooling, clutch, brakes, engine timing, and suspension.
| Identifier | ExFiles\Box 21\4\ Scan089 | |
| Date | 10th December 1930 | |
| -2- Time to pass 5 galls. of water at 75º (1250 revs. of engine) 5 mins. 15 secs. Clutch - ease of changing - very good. No squeaks, no jaggers, picks up smoothly. Brakes very spongy - fairly good ( 4 brakes) do not jagger. Brake Test on wet Tarmacadam - London Road. M.P.H. Distance. yds. 20 14 30 33 40 53 Engine Valve Timing - taken on piston. No.1 cylinder. No.5 cylinder. I.O. 1 mm B.T.D.C. ½ m/m B.T.D.C. } I.C. 14 mm B.B.D.C. 15 m/m P.B.D.C. } .008" clearance E.O. 28 mm B.B.D.C. 22 m/m B.B.D.C. } E.C. ½ mm P.T.D.C. T.D.C. } Bore of cylinder 80 m/m stroke 150 m/m Valve lift - Inlet 13/32" Exhaust ⅜" dia. of port. Compression - No.2 cyl. 72 lbs. sq. in. No.5 cyl. 70 " " " Cu. capacity 14, 14¼ cu. ins. Vacuum in Induction Pipe. 1000 engine revs. full throttle .4062. Springing. front - elliptic springs 10 leaves. 39" long - centre axle bolted 21" from rear. Rear - elliptic springs - 51½" long. underslung. Springs take torque hard at slow speeds over pot holes - good at high speeds. Front inclined to buck jump. Shock absorbers - rear only -(Houdaille) Ignition - Magneto S.E.V. two spark. Timing - full retarded 3/16" B.T.D.C. measured on piston full advanced 7/16" B.T.D.C. Contd:- | ||