A.C. (Acedes) Cars Ltd., are making a welcome return to the sports car market with a completely redesigned edition of the two litre six cylinder car. The engine, which is the outcome of pioneer experience with small sixes, has been little altered, but the new model has been brought into line with present-day practice by utilising a double-dropped frame. A normal four-speed gearbox in unit with the engine replaces the three-speed layout which was incorporated in the back axle.
With a bore and stroke of 65 and 100 mm., the six cylinders have a total capacity of 1,991 c.c., the treasury rating being 15.7 h.p. The cylinders are fitted with liners. The five-bearing crankshaft carries a vibration damper and the engine is insulated from the frame by rubber insets. The forward end is carried on a single point on a cross member, while the back of the engine is bolted to a steel plate interposed between the clutch housing and the gearbox; this plate is insulated where it is bolted to the chassis members.
The valves are operated through rockers from a single overhead camshaft which is driven by chain from the rear end of the crank-shaft, tension being maintained by a patent spring tensioner. The forward end of the camshaft drives a water pump.
The sump holds two gallons of oil, and is readily filled through a cap on the near side of the engine, and the filter is also accessible on the other side. A cross-shaft drives the dynamo and the distributor for the coil ignition. Lucas Startia equipment, which re-starts the engine in the case of involuntary stoppage in traffic or other places, is featured.
Three S.U. carburettors are fitted on the off-side of the engine, and are supplied by a large Autopulse mounted on the dash. This also carries fuse boxes and other electrical equipment, and the tools are stored there in a neat locker.
A Borg and Beck clutch transmits the drive to a unit four speed gear-box with silent third, the ratios with a 4.66 back axle being 4.66, 6.4, 9.3 and 17.7 to 1. Alternately a back axle with a 4.33 ratio can be fitted. A remote control centrally fitted brings the gear-lever, which works in a gate, under the driver's left hand. An open propellor shaft with Hardy couplings drives the spiral bevel back axle.
The new chassis is a very sturdy structure. The front dumb-irons and chassis run in a straight line as far as the dash where the side members are dropped and continue at a lower level until they sweep up again over the back axle. In plan the front of the chassis is narrow and is tied with a rod between the dumb-irons, and then widens out gradually. A tube below the radiator supports the front end of the engine, and another beneath the clutch casing braces the centre part of the frame. Two further struts add to the rigidity, one of them bracing the forward rear spring mounting and two more stay the upswept portion at the rear of the frame, and take the weight of the ten gallon petrol tank.
Semi-elliptic springs are now fitted back and front, and a dropped front axle, H sectioned in the middle with rounded ends to take the brake torque, helps to maintain the low chassis line. Bendix duo-servo brakes are fitted, cable-operated, and are applied by hand or foot. The hand-brake lever is on the right, and is far enough forward to clear the door.
The Magna-type wheels carry 29 by 5 inch Goodyear tyres, the Lucas electrical equipment is very full and includes direction indicators and stop and reversing lights, and the radiator has been lowered and is now less pointed than the earlier type, and its appearance is further improved by a plated bar from top to bottom of the honeycomb.
New types of bodywork have been designed for the new chassis, and those we saw were very pleasing. An open four seater with cutaway sides had swaged aluminium wings to match the aluminium bonnet, blue panels and red upholstery. The driving position and the seats were comfortable. Equally smart are the Silent Travel Saloon, with its pillarless doors with rubber-insulated locks, and a drophead coupe.
The sports series, which differ from the standard cars in respect of camshaft, compression ratios and the three carburettors, are expected to attain 80 m.p.h. The prices are :—Sports chassis £360; open four seater £425. The closed bodies can also be fitted to the sports chassis.
The makers' address is A.C. (Acedes) Cars Ltd., Thames Ditton, Surrey.