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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).
Condensed specification sheet detailing engine, transmission, and chassis information.

Identifier  ExFiles\Box 42\2\  Scan080
Date  18th September 1922 guessed
  
(B)
CONDENSED SPECIFICATION.

Engine 21.6 HP. (R.A.C.) 6 cylinder, 3" x 4½", (3150 cc.)
Unit construction (with gearbox) 3 point suspension, monobloc with detachable head, overhead valves, pushrods, RR. battery ignition auto advance, forced lubrication, cooling by pump circulation, RR. automatic expanding carburetter.

Single dry-plate clutch.

3 Speed gearbox, central levers.

Back axle spiral bevel. Road wheels mounted completely on axle tubes - both brakes on rear wheels.

Road springs semi-elliptic - front and rear.

Wheelbase 129".
Track 54".
Road wheels 32 x 4½ Dunlop detachable wire.
Straight sided cord tyres.
Petrol tank at rear capacity 14 gals. vacuum feed.
Chassis weight complete with tyres & battery - 2020 lbs.

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