Armstrong Siddeley 20 20/25 hp

Production period:	1927 to 1940
Engines:	Petrol: 2.8,2.9,3.2,3.7 liters
Length:	4293-4725  mm
Width:	1422  mm
Wheelbase :	2946-3366  mm

The Armstrong Siddeley 20 hp is a car built by the British manufacturer Armstrong Siddeley from 1927 to 1940 as a successor to the 18 hp Mark II .

History

The Twenty was a new model for 1927 it replaced the model 18 hp Mark II. Unlike this,it had a 2.9 litre pushrod ohv engine side-mounted six cylinder in-line , even if the displacement of 2872 cc (bore × stroke = 73 mm × 114.2 mm) was the same. The performance is max power, 85 bhp at 3200 rpm.Max speed 75 mph/ 120 kmh.

Like all pre-war models by Armstrong Siddeley, the 20 hp also had two rigid axles. The front axle hung on semi-elliptical longitudinal leaf springs. For the short wheelbase model (3048 mm) this also applies to the rear axle. The model with longer wheelbase (3277 mm) had as the last model of the manufacturer still a rear axle with cantilever suspension . A choice of wheel bases, the 120 in (304.8 cm) Short Twenty and the 129 in (327.6 cm) Special Twenty.

Renamed to the Long Twenty appeared in 1932. This was the year when the range was revised, the new models being called New Twenty. Engine capacity was enlarged to 3.2 litres and fluid fly wheel transmission was optional on the Long Twenty.The short models used the Wilson pre-selector gearbox, first introduced by Armstrong-Siddeley in 1929., the cars had become slightly larger than their predecessors.The new engine had a displacement of 3190 cc (bore × stroke = 73 mm × 127 mm). 100 km / h as the maximum speed. 

Of both models (20 hp and 20 hp New) together 8847 copies were built up to 1936.

In 1936, the 20/25 hp replaced the New 20 hp. The body had remained about the same size, the engine had grown again. The new engine had a capacity of 3670 cc (bore × stroke = 82.5 mm × 114.3 mm). With a single SU carburetor he made 85 bhp (62.5 kW) at 3500 / min. The top speed increased significantly to 130 km / h.

Also new was the "Atlanta Sports Saloon", a sporty sedan with four doors.

1939 appeared the 20 hp Mark II . This had a much smaller engine than its predecessor. The new engine had a displacement of 2783 cc (bore × stroke = 75 mm × 105 mm). 

In 1940, the 20 hp Mark II was discontinued due to the war without successors. Of the two last models (20/25 hp and 20 hp Mark II) together, only 884 copies were made.