The car used a standard 2663 cc six-cylinder side-valve engine with a power of 68 bhp (51 kW). The engine differed from that used in ordinary cars because it has Dural connecting rods, an aluminum cylinder head with a 7: 1 compression ratio and two RAG carburetors. At 8 feet and 8 inches (2.64 m) in length, the chassis was an abbreviated version of that used in the SS 1, and was also provided by Standard. The suspension was by semi-elliptical springs all around, with a rear axle suspended. The brake system was the Bendix.
Cars quickly gained attention for their elegant sporting style, but were not well regarded by the sporting fraternity, as their performance did not match their appearance. The performance of the real sports car had to wait for the SS 100, which had a similar style and suspension, but an engine equipped with an upper valve head.
The SS 90 does not appear to have been independently tested by any magazines, so contemporary performance figures are unknown, but it is believed to be able to reach 140 km / h. In 1932, the basic tourer cost £ 395. Twenty-three were made.
The car was 3.81 m long and 1.60 m wide and typically weighed 1,143.0 kg.
Upon leaving the factory, he originally fitted 5.50 × 18 Dunlop tires on 18-inch wheels. The SS 90 prototype, ARW395, was owned by Hugh Kennard from 1938 until at least November 1940. The prototype is one of the surviving cars.
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