New body October 1926
The car that was destined to succeed the Twenty, the six-cylinder 20/6, was announced at the October 1926 London Motor Show[16] with production really starting in early 1928, and until 1930 the two different engines were sold alongside each other, but 1929 would be the last year of full production for what was now called the 20/4.
There was a 12-volt electrical system for lighting and starting. Timing was at the back of the engine. From there on the off-side were driven in-line the generator, water-pump and magneto.[13] Reported refinements for the 1929 Motor Show included: chromium-plated exterior fittings, Triplex glass, improved (dome type) "mud wings (front mudguards) and new gas (sic) and ignition control levers "neatly placed above the steering wheel".[17] For 1930 the specification included Biflex magnetic dip and switch headlights and wire wheels.[18]
Chassis
The engine, clutch and gearbox, which was centrally controlled, all formed one assembly that was held in the frame by two brackets with a rubber-lined frame at the front. The rear axle was three-quarter floating.[13]
Steering
Steering is worm and worm wheel type. Beneath the hand wheel there is a convenient ring-operated horn switch.[13]
Brakes
Behind the gearbox there was a "locomotive" transmission brake operated by a hand lever on the off-side of the gear lever. The brake's shoes were to some extent self-adjusting but might be regulated by two hand screws. "This brake is intended to be more than just a parking brake". The four wheels had brakes operated by rods from the brake pedal. Compensation was made so that balance was preserved in the back and front sets of brakes. The application was partly taken by rods but finally by cables. The brake drums were enclosed and have outlets for water or oil. The front braking mechanism was simple, there was only one arm which had anchorage above the pivot pin and did not turn with the wheel. The cams were at the bottom of the drums and the steering pins were hollowed to allow the necessary expanding control.
Steering
Steering is worm and worm wheel type. Beneath the hand wheel there is a convenient ring-operated horn switch.[13]
Brakes
Behind the gearbox there was a "locomotive" transmission brake operated by a hand lever on the off-side of the gear lever. The brake's shoes were to some extent self-adjusting but might be regulated by two hand screws. "This brake is intended to be more than just a parking brake". The four wheels had brakes operated by rods from the brake pedal. Compensation was made so that balance was preserved in the back and front sets of brakes. The application was partly taken by rods but finally by cables. The brake drums were enclosed and have outlets for water or oil. The front braking mechanism was simple, there was only one arm which had anchorage above the pivot pin and did not turn with the wheel. The cams were at the bottom of the drums and the steering pins were hollowed to allow the necessary expanding control.[13]
Suspension
The front and back springs were half-elliptical. At the back they were carried under the axle. Both sets had lubricating gaiters and shock absorbers. There was no camber to the forward springs. There were no stops behind the back shackles.[13]
Pricing
- Ascot 4-cylinder £620 [19]
- Open Road tourer 4-cylinder £425 [20]
- Open Road tourer 6-cylinder £525
- Carlton saloon 4-cylinder £495 [21]
- Carlton saloon 6-cylinder £595
- Marlborough landaulette 4-cylinder £475 [22]
- Mayfair 4-cylinder £715 [23]
Road test
Seats are comfortable. The speedometer only showed up to 60 mph, within the engine's capacity. No sign of overheating. Clutch satisfactory, lower gears much quieter than on previous Austins. Brakes suspension and steering were not at all bad but could be made better.[13]
New body August 1932
"A body design that makes this magnificent seven-seater even more than ever like a £1,000 car. Its streamline front, waistline moulding and petrol tank housing, all new, enhance its superb lines".[26] Synchromesh was added to the gearbox in mid 1933. Other minor improvements included: illuminated semaphore direction indicators, side deflectors for the front door windows and an interior visor, a lockable metal spare wheel cover.[27]
The Twenty remained available as a Ranelagh limousine or landaulette both on a wheelbase of 11 ft 4in., £595, or as a Whitehall saloon with a 10 ft wheelbase £515.[27]
Road test
This 7-seater limousine has four good doors and six side windows. Front seat is fixed as is unfortunately the windscreen but the screen is large and gives a good view. The back seat has three armrests. The occasional seats fold away neatly, give enough support to the back and knee and toe room is well arranged. Equipment includes such fittings as: two interior lights, five blinds, parcel net and ventilator in the roof, bag pockets on the doors. Upholstery in the rear is cord and in front is leather. There is a large cupboard to the left of the instruments. An amplifying telephone (to the driver) is provided. The gear lever has a catch for reverse and a quiet-second together with synchro-mesh is provided. There are just the four brakes which are applied by rods and cables by hand lever or by pedal. The half-elliptical springs have Silentbloc shackle bushes and zinc interleaves and are damped by hydraulic shock absorbers. Price £575.[14]
New body August 1934
"Clean-cut beauty in the modern trend". "Entirely new frontal design including a longer bonnet and new-shaped radiator and rear panelling". Synchromesh on all but first gear.[29] Flush direction indicators with automatic return. Bumpers are fitted fore and aft. The spare wire wheel and its tyre are now carried in the boot and the luggage platform on the door can be swivelled to one side. Dip and switch of the headlamps is controlled by a foot button. The Jackall four-wheel hydraulic jacks, workable from inside the car, will raise all four wheels at once or the front and back ones in pairs. The brakes are of Girling type.[30][31]
Road test
The engine has been greatly improved in its running as to its smoothness and refinement probably due to the revised carburation. Synchromesh is often obstructive for second gear. The landaulette will do about 65 miles an hour in top gear. Price £650, landaulette and limousine.[31]
- Produced:
- 1933— 629
- 1934— 491
- 1935— 555
- 1936—
- 1937— 380