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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:
  
  


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