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 specification sheet for a Delage Car, No. 7573, detailing weight, gear ratios, and engine parameters.
| Identifier | ExFiles\Box 21\4\ Scan078 | |
| Date | 23th July 1920 | |
| X3500 23/7/20 DELAGE CAR. No. 7573. Weight - rear - 12 cwt. 0 qrs. front - 15 " 2 " Total 1 ton. 7 cwt. 0 qrs. Rear Axle ratio 3.75 to 1. Reverse Eng: 4.700 to 1 - brake drum. 1st. gear " 3.65 to 1 " " 2nd. " " 2.4 to 1 " " 3rd. " " 1.55 to 1 " " 4th. direct. Radiator matrix 22" long - 20" broad - 3 3/4" thick. 5 mm. tubes (round) (7 mm. hex: at ends) bottom tank 1" space. Top tank - Valve timing. - measured by piston. Inlet valve. Exhaust valve. O C O C T.D.C. 8/9"P.T.D.C. 1"B.B.D.C. T.D.C. Lift of valves 3/8". Magneto timing retarded 1/16th." B.T.C. Stroke of Piston 150 mm. bore 80 mm. Valve caps cast in Aluminium. Dia. of rear brake drums 16.1". Volume Capacity 15.5 cu.ins. Movement of clutch trunnion 7/16". Height of frame (top) from ground - back of dash - 22.375" front end of rear spring 24". Minimum ground clearance - Front axle 8.500" Undershield under flywheel 7.750. Consumption Test - 20 M.P.H. 16 4/5 miles per gall. ) London Rd. 40 M.P.H. 18 " " " ) dry and light wind. Contd: | ||