In 1932, New Imperial started to use unit construction, where the engine crankcase and gearbox are incorporated in the same casting.
They made a Unit Minor 150 and Unit Super 250.
They continued to use unit-construction, and some models used Bentley and Draper sprung frames, in an era still dominated by rigid frames.
By 1938 all New Imperial engines employed unit construction.
In 1934 Ginger Wood, riding a New Imperial 500 cc V-twin for one hour, achieved a 102.2 mph (164.4 km/h) average at Brooklands.
In September 1935 R J D 'Bob' Burnie of Sketty, Swansea, completed 'The Flying Kilometre' at Southport Sands in the British Open Speed Championship on the same bike with a speed of 100.76 mph.

Bob Foster won the 1936 Lightweight TT handsomely on a unit-construction model.
This was the last time that Great Britain won a Lightweight TT.
Despite the advanced engineering, and the spectacular TT win by Foster, sales did not improve.
In 1932, New Imperial started to use unit construction, where the engine crankcase and gearbox are incorporated in the same casting. They made a Unit Minor 150 and Unit Super 250. They continued to use unit-construction, and some models used Bentley and Draper sprung frames, in an era still dominated by rigid frames. By 1938 all New Imperial engines employed unit construction. In 1934 Ginger Wood, riding a New Imperial 500 cc V-twin for one hour, achieved a 102.2 mph (164.4 km/h) average at Brooklands. In September 1935 R J D 'Bob' Burnie of Sketty, Swansea, completed 'The Flying Kilometre' at Southport Sands in the British Open Speed Championship on the same bike with a speed of 100.76 mph.
Bob Foster won the 1936 Lightweight TT handsomely on a unit-construction model. This was the last time that Great Britain won a Lightweight TT. Despite the advanced engineering, and the spectacular TT win by Foster, sales did not improve.
New Imperial Motors