The Alvis Firefly is a car manufactured by Alvis from 1932 until 1934. It followed on from the 12/50 TJ model.[1]
The car has a straight-four engine with overhead valves. The engine, with a single SU carburettor and a displacement of 1,496 cm3, develops 50 bhp at 4,500 rpm. The engine is essentially the same as that of the 12/50 TH model from 1927, and of the 12/50 SD from 1927 to 1929. This made it economical to manufacture, and put the car in the 1.5-litre class, which was popular at that time.
A roadster was introduced in 1932.[2] In 1933, a four-door tourer, a saloon, and a two-door convertible were introduced, all under the name Alvis Firefly 12.[3]