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Citroën Types AC 4 and AC 6 (C4 and C6

	Type AC 4	Type AC 6
Number of cylinders	Four	Six
Cubic capacity	1 628cm3	2 442cm3
Bore and stroke	72 x 100mm	72 x 100mm
Power output	30bhp @ 3 000 rpm	45bhp @ 3 000 rpm
Transmission	Rear wheel drive via three speed gearbox
Brakes	Foot operated pedal operating on drums front and rear with Westinghouse servo
Suspension	Front : semi elliptical springs Rear : semi ellipticalelliptical springs
Steering	Worm and roller
Top speed	80 kph	105 kph

The Type AC 4 (above) was launched in 1928 in the Paris Salon as was the six cylinder AC 6 (right) both of which shared similar styling, albeit that the AC 6 had a longer bonnet than its four cylinder sibling.

The AC 4 was available in a variety of body styles including Berline Luxe, Conduite Interieure Luxe, Familiale Luxe, 2 & 4 seat Cabriolet Decapotable, 2 & 4 seat Faux Cabriolet, Torpédos and Taxi. The AC 6 was also available as a Coupé de Ville.

In 1929, both vehicles were modified and renamed C4 and C6 and with a number of further modifications remained in production until 1932.

Above - 1932 C6 G roadster
Right - 1928 C6 CGE tourer

In 1930, the C4 III was introduced with an increased top speed of 90 kph while the C6 F had a top speed of 105 kph and was fitted with "Moteur Flottant" flexible engine mountings. In 1931 the C4 III was superceded by the C4F also fitted with the "Moteur Flottant" mountings and an improved version of the C6 - the C6F "CGL" was also launched.

Left - C4s

In 1932, the C4G with an engine of 1 767cm3 developing 32 bhp @ 2 700 rpm was launched and the C6G was also launched with an increased engine capacity of 2 650 cm3 developing 50 bhp @ 2 700 rpm.

Traction Avant overtaking a pair of C6s (below)

Right C6s

C4, C6 and B2 pictured outside the Conservatoire (below)