|Body and chassis|
|Length||132 inches (3,353 mm)|
|Width||63 inches (1,600 mm)|
|Kerb weight||1,813 lb (822 kg)|
|Designer||Mark Wild and staff|
|Production||1924 - 1933|
|Displacement||1,074 cc (66 cu in)|
|Cylinder bore||60 mm (2.4 in)|
|Piston stroke||95 mm (3.7 in)|
|Head material||aluminium alloy crankcase|
|Valvetrain||overhead valves by Duralumin pushrods, chain-driven camshaft|
|Oil system||forced lubrication by a gear pump in the sump|
|Cooling system||water pumped through radiator, no fan|
|Power output||20 bhp (15 kW; 20 PS)|
@ 3,000 rpm
Tax horsepower 8.93
|Dry weight||329 lb (149 kg)|
The Rover 9 was a small car produced by Britain's Rover car company. It had a 1074 cc 9 fiscal horsepower four-cylinder engine. Manufactured from 1924 to 1927 it was first supplemented then replaced by Rover's 10-12 model.
A Mark Wild and staff designed 1074 cc water-cooled four-cylinder engine with overhead valves announced August 1924 supplemented then replaced the Rover 8 air-cooled twin and the new vehicle was named 9/20 The new engine with its clutch and gearbox are mounted as a unit to the mainframe at four points.z
Advertised by Rover as "The Nippy Nine" with emphasis on its water coolant circulated by pump, pressure lubricated engine, three speed gearbox and silent worm (rear) axle. "Super" models were supplied with rod-operated four-wheel brakes. Steering was by rack and pinion, worm and segment in the more expensive cars. At first the open 4-seater cars had just one door beside the front passenger's seat.
- Standard open 2-seater, open 4-seater tourer
- De Luxe open 2-seater, open 4-seater tourer, fixed head coupé
- Super open 2-seater, 4-seater, fixed head coupé and 4-door 4-seater Weymann saloon
- Sports 4-seater
The wheelbase was 104 inches and track 48 inches. The 4-seater sports had a 99-inch wheelbase.
The test car was the sports model with aluminium pistons, double valve springs, higher gear ratios and a lighter body. The car was considered to run pleasantly and do around 60 mph in top gear. When supplied for export the radiator is given a fan. There were complaints about accessibility for servicing and minor repairs. The engine was thought to be unusually smooth for a two-bearing product even at high speed. The steering wheel shook on rough roads otherwise controls were smooth and even. A final comment was "at the price one cannot fairly grumble at three speeds".
- Cars Of To-Day. The Times, Tuesday, Aug 12, 1924; pg. 7; Issue 43728
- Hough and Frostick, Rover Memories, Allen & Unwin, London 1966
- Malcolm Bobbit, Rover P4, Veloce, Dorchester, 2002 ISBN 9781903706572
- The Motor Show. The Times, Friday, Oct 17, 1924; pg. 20; Issue 43785.
- The Motor Show. The Times, Friday, Oct 09, 1925; pg. 8; Issue 44088
- Cars Of To-Day. The Times, Tuesday, Apr 20, 1926; pg. 11; Issue 44250
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