Austin 25/30
The Austin 25-30 is a motor car. It was the first automobile produced by newly established British car manufacturer Austin.
In the last week of April 1906 a large body of motorists travelled to Longbridge "where snow lay full three inches deep on the ground and was still falling fast" to see the new Austin car, a conventional four-cylinder model with chain drive. The engine's tax horsepower rating would have been. It was also available in a cheaper version as a 15/20 hp complete at £500 as well as the 25/30 hp for £650. The sole concessionaire for sale of the cars was Mr Harvey du Cros junior.
Between April and October 1906 only 23 cars, mostly 25-30s were sold. This was minute when compared with the output of the whole British motor industry. In the following 12 months to October 1907 147 cars of all models were sold.
The 25-30 was manufactured for more than a year with a total of 65 cars produced. It was replaced in 1907 by the Austin 40 hp which used a bored-out and simplified 25-30 engine.
Chassis
The frame was made of very stiff section steel. A subframe was provided to make the engine clutch and gearbox one unit. By the standards of its day the chassis was entirely orthodox but it was of first class quality and provided excellent reliability.Engine
Previous Herbert Austin cars for Wolseley Motors, which Austin founded, kept horizontal engines after vertical engines became the norm. Herbert Austin allowed his refusal to specify vertical engines to become the contract-breaking component of his disagreements with the Wolseley directors. He would provide a list of very pressing reasons for giving preference to horizontal engines. This 25-30, the first car bearing his own name, had a vertical engine. Either Austin reviewed his stance and changed it or his backers made him change.This vertical straight 4-cylinder 318 cu in T-head engine with bore x 5 in stroke was automatically governed to a maximum of 900 rpm.
Cylinder block
Each cylinder is a separate casting.Fuel system
The carburettor is an automatic diaphragm Krebs type. The automatic throttle is coupled to the centrifugal governor which is mounted on the same shaft as the fan and can only be controlled by the accelerator pedal. The magneto is driven from the inlet valves' camshaft as is also the commutator and the pump for the engine lubrication system.Dual ignition
On the right hand side of the engine there is dual ignition at each cylinder first from the magneto supplying low-tension power to complex ignitors inside the inlet valve caps and again from conventional high-tension sparking plugs through a distributor from the accumulator dynamo and coil. The low tension igniter and the high tension sparking plug are mounted on the inspection cover above the inlet valves.A low tension make-and-break contact spindle rises diagonally from its camshaft through the main casting so it makes or breaks contact with the insulated contact pillar on the inlet valve cap. The necessary quick-break action comes from a coil spring at the bottom of the spindle. The high-tension sparking plugs are close alongside the contact pillars.
Valve and ignition camshafts
The exhaust poppet valves are on the other side of the engine. Arranged symmetrically at the top of the engine the inlet and exhaust valves are interchangeable.The valves have a detachable cover over each valve giving easy access for adjusting seating or complete withdrawal. Between the cams and tappets there are fingers which can be set with the engine running. There is a similar arrangement for the ignition tappets. However the timing of the ignition can be varied with a lever above the steering wheel. The lever moves a timing shaft which moves the tappet pivot-pins inward or outward. The axis of the commutator shaft rocks at the same time. This arrangement brought about oil sealing problems when pressure lubrication became more complicated.
The spur wheels that operate the two camshafts are enclosed in a neat dust-proof casing.