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Thornycroft 45hp/Silver Ghost Comparison

 

Thornycroft 45 hp

Rolls-Royce Silver Ghost

Year announced

1907

1906

Data given below for model year

1908

1908

Offered as

Chassis or complete car

Chassis

Engine

 

 

Type

6-cylinder in-line four-stroke petrol. Front engine mounted fore-aft

6-cylinder in-line four-stroke petrol. Front engine mounted fore-aft

Bore and stroke ins (mm)

4.5 x 5 (114.3 x 127)

4.5 x 4.5 (114.3 x 114.3)

Swept volume (cc

7,819

7,038

RAC hp

48.6

48.6

Cylinders

Cast iron. 3 blocks of 2 cyls

Cast iron. 2 blocks of 3 cyls

Pistons

Cast iron

Cast iron

Crankshaft

4 bearing forged steel

7 bearing

Crankcase

Aluminium

Aluminium

Valve-gear

Camshaft-operated side valves

Camshaft-operated side valves

Lubrication

Forced by oil pump

Forced by oil pump

Cooling

Water

Water

Power output (bhp/kw@rpm)

44.8/33.4@1,000 (1910 data)

 

Transmission

 

 

Type

3 speed manual, rear-wheel drive via propellor shaft.

4 speed manual, rear-wheel drive via propellor shaft.

Direct drive on

Top gear

3rd gear

Gearing (mph (kph) @ rpm in top)

35.5 (57.1)@"normal" engine speed (1,000 rpm assumed)

48 (77.2)@1,000

Axles and suspension

Beam axles front and rear suspended from leaf springs.

Beam axles front and rear suspended from leaf springs.

Brakes on

Rear-wheels and transmission

Rear-wheels and transmission

Weight of chassis lbs (kg)

3,024 (1,371.7)

 

Wheelbase ft (m)

11 (3.35)

11.29 (3.44) short wb version

Price (£)

775

c1,000