Singer SM 1500 Roadster, Model 4AD, look identical to the Singer Nine Roadster, but have a 1497-cc 48 bhp power unit and detail differences. First introduced as an export-only model early in 1951, it become available on the home market in January 1953. During 1952 the width of the radiator grille slats was reduced and the pressure of the cooling system raised to correct earlier overheating problems.
Singer SMX Roadster is an experimental plastic-bodied sports model. Fitted with a twin-carburettor version of the 1 ½ -litre engine, it is longer and lighter than the SM1500 Roadster which it was to replace. It did not get beyond the prototype stage, however, and only one was ever built.
From 1953, optional twin carburettor gives 58 bhp and 78 mph top speed in SM 1500.
Saloon gets bigger rear window, new bumpers, grille and push button door handles. New fascia panel with circular dials.
NEW MATERIAL: The new Singer Roadster is unique in Britain in offering a body wholly made from glass reinforced polyester resin.
The Motor YEAR BOOK, 1954 BRITISH CARS OF 1953 SINGER SMX ROADSTER
Singer Motors Ltd. made automobile history in 1953 by being the first British manufacturers to announce a production model with a body shell constructed entirely of plastic. Known as the Singer SMX Roadster, the new car is an additional model to the normal-bodied Roadster which will be continued in production without alteration.
The attractive new body, indistinguishable externally from a metal body, is constructed from glass fibre reinforced polyester resin and consists chiefly of two big mouldings. The front moulding extends from the radiator to the scuttle and includes the front wheel arches which are moulded separately and then bonded to the main moulding. This whole assembly is hinged on the front cross-member and tilts upwards and forwards to give full access to the engine. The rear moulding extends backwards from the trailing edges of the two doors and includes the back wings, the rear decking of the body, the luggage and spare wheel compartments and the boxes to receive the hood irons. Additional mouldings comprise the two big doors, the scuttle and the facia panel complete with glove boxes.
The body is strengthened by two hoops of drawn mild steel tubing, one beneath the scuttle and the other to the rear of the back seat, and by additional tubing incorporated in the rear moulding. These tubes are bonded to the body and the two hoops end in flitch plates which are then bolted to the chassis. The ribbed light-alloy floor is also bonded to the body shell.
Full four-seater accommodation is provided by the new body, which has twin bucket seats in front and the normal bench-type rear seat, whose squab is tilted forward to give access to the luggage compartment in the tail. The spare wheel is carried in the floor of the luggage compartment and roofed over by a plastic cover. Even the door giving access to the petrol filler cap is a small plastic moulding.
The only alterations to the chassis are the fitting of 5.50 x 15 tyres instead of the 5.00 x 16 employed on the standard Roadster model, and an increase in the capacity of the petrol tank from seven gallons to 10 gallons. The entire production of the SMX Roadster is to be exported. The new model is expected to weigh about 1-1¼ cwt. less than the standard Roadster.