Rover 12

Rover 10-12
open 4-seater without engine bonnet
Overview
Manufacturer	Rover
Production	1905-1907
Model years	1906-1907
Body and chassis
Body style	open 4-seater
Layout	front engine rear wheel drive
Powertrain
Engine	1767 cc straight 4
Dimensions
Wheelbase	84 in (2,134 mm)

Rover 10-12
Combustion chamber
Configuration	straight four
Displacement	1,767 cc (108 cu in)
Cylinder bore	75 mm (3.0 in)
Piston stroke	100 mm (3.9 in)
Output
Power output	not published Tax horsepower 13.95

Rover sleeve-valve 12
4-seater standard flush-sided open tourer body 1911
Overview
Manufacturer	Rover
Production	1911-1912
Body and chassis
Body style	open 2-seater 4-seater tourer chassis only
Related	Rover 12 2-cylinder and 4-cylinder
Powertrain
Engine	1882 cc two-cylinder sleeve-valve
Transmission	multiple dry clutch, universal joint to 3-speed gearbox, universal joint to enclosed propellor shaft and overhead worm final drive
Dimensions
Wheelbase	100 in (2,540 mm) 106 in (2,692 mm) Track: 50 in (1,270 mm)
Length	148 in (3,759 mm)
Width	61.5 in (1,562 mm)
Kerb weight	chassis only 1,792 lb (813 kg) std 4-str car 2,352 lb (1,067 kg)
Chronology
Predecessor	Rover 2-cylinder 12 horsepower
Successor	Rover Clegg 4-cylinder 12 horsepower

Knight-Rover sleeve-valve
Overview
Manufacturer	Daimler Company Coventry
Combustion chamber
Displacement	1,882 cc (115 cu in)
Cylinder bore	96 mm (3.8 in)
Piston stroke	130 mm (5.1 in)
Cylinder block alloy	cast iron monobloc
Valvetrain	Knight sleeve-valve driven by chains from skew drive from crankshaft
Combustion
Fuel system	Daimler twin-jet carburettor, gravity feed from scuttle
Management	Bosch dual-ignition
Fuel type	petrol from tank above driver's knees
Oil system	oil from sump pumped to troughs and splashed by big ends, sleeves by driver-operated mist spray
Cooling system	water pumped to radiator and cooled by engine-powered fan
Output
Power output	not published Tax horsepower 11.43

Rover Clegg 12 and 14
1914 Rover Twelve designed by Clegg
Overview
Manufacturer	Rover
Production	1911-1924 13,000 approx made
Designer	Owen Clegg
Powertrain
Engine	2297 cc side poppet valve straight 4
Transmission	3 or4 speed manual
Dimensions
Wheelbase	110 in (2,794 mm)—1911 116 in (2,946 mm) Track 50 in (1,270 mm)
Length	163 in (4,140 mm) 168 in (4,267 mm)
Width	65 in (1,651 mm)
Kerb weight	chassis only 1,568 lb (711 kg) entire car - not published

Rover Pilot
Pilot with special sports body
Overview
Designer	engine designer B H Thomas
Body and chassis
Body style	chassis only pressed steel 6-light saloon Weymann saloon Weymann Sportsman's Coupé
Powertrain
Engine	1,410 cc (86 cu in) ohv st.6 12 1,577 cc (96 cu in) ohv st. 6 14
Dimensions
Wheelbase	104 in (2,641.6 mm) 112 in (2,844.8 mm) Speed track 50 in (1,270.0 mm)
Kerb weight	2,912 lb (1,321 kg)

Rover 12 P1 & P2
1935 6-light saloon
Overview
Manufacturer	Rover
Production	1934-1948 22401 made
Body and chassis
Body style	chassis only 6-light saloon sports saloon 2-door coupé open 4-seater
Powertrain
Engine	1496 cc ohv straight 4
Transmission	4-speed manual
Dimensions
Wheelbase	105 in (2,667 mm)(1934) 112 in (2,845 mm)(1935 on)
Length	169.5 in (4,305 mm) to 172 in (4,369 mm)
Width	62 in (1,575 mm)
Chronology
Predecessor	Rover Pilot

The Rover 12 was a name given to several medium-sized family cars from the British Rover car company between 1905 and 1948.

The Rover 10-12 was the fourth model Rover made, following their 8 hp, 6 hp and 16 hp. It was launched in November 1905 and displayed at that year's Olympia Motor Show. It had a four-cylinder, water-cooled, side-valve, monobloc engine of 1767 cc.

The new Rover 12 used a two-cylinder, water-cooled, side-valve engine of 1624 cc. The chassis and rear axle of this car would go on to be used in modified form in the 1912 cars.

Many of these cars saw use as taxis.

A supplementary model of Rover 12 with a Knight-Rover two-cylinder, water-cooled, sleeve-valve engine of 1882 cc with a two-seater body was announced in October 1910 for the Olympia Motor Show though Rover's intention to produce it was published in mid-1910. Daimler engines were at that time cast in pairs of cylinders, this engine was half a four-cylinder 1909 22 hp Daimler.

The connecting rods for the two cylinders are side by side on the same crank pin making firing points equidistant. The engine is mounted directly on the chassis frame. It can be seen from the illustration the rearmost bracket rolls over the flywheel making the rear mountings much further apart from the front set than would be allowed by mounting the engine direct from the very short block. Magneto, distributor and water pump are driven by skew gear from the front of the crankshaft as are the pinions and chains which drive the valve shafts operating the sleeve valves. The two jet carburettor incorporates a silencer on its air intake. The first jet is used only at starting or at idle.

A supplementary air supply controlled by a foot pedal operated at will by the driver provides an oil mist from inside the engine's crankcase to lubricate the tops of the valve sleeves. A three-plunger pump driven by the valve shaft forces oil from the sump to troughs under and in the path of the big ends. With each revolution the big ends dipping into the troughs throw oil to all parts of the engine. The dashboard has a telltale to warn if the pump is not working properly.

The chassis was entirely new. The metal to metal multi-plate clutch requires no lubrication. Two plates are phosphor bronze, the others are steel. There is a double universal joint (a sliding block allows for withdrawal of the clutch) between the clutch and the gearbox. The gearbox is mounted on a separate underframe, all its shafts run on ball bearings. There are three forward speeds. The propellor shaft is fully enclosed and has a ball and fork joint at its forward end. Final drive is by overhead worm.