In 1927 Arrol-Johnston were merged with Aster of Wembley, London to form the combined marque of Arrol-Aster, with directors from both Arrol-Johnston and Aster. The 15.9 hp was retained as were the two current Asters. Both the latter were given Burt-McCollum single sleeve valve engines in the interests of silence, but the 21/60 hp Aster was also available in its original ohv form, renamed the Arrol-Aster. Another completely new Arrol-Aster was the 2.5-litre 6-cylinder 17/50 hp with sleeve valves. The 21/60 hp Arrol-Aster and the 15.9 hp Arrol-Johnston were dropped for 1929, and a straight-8 Arrol-Aster substituted. It had a 3.3-litre sleeve valve engine consisting of the 17/50 unit with two extra cylinders and was available in supercharged form. This was a fast car intended as a sports model, but unlike the French sleeve-valve designs it could not produce high outputs as revolutions were limited.
The company lasted for two years before the company went into receivership. Limited production and sales continued until 1931.
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... Arrol-Aster 23/70 Production 1927–1930 80 approx produced (including 17/50 models) Body style saloon 4-seat convertible 5-seat coupé Engine 3293 cc Straight-8 Sleeve valve Wheelbase 135 inches (3429 mm ...