What was the name given to a 'home made' café racer motorcycle of the '50's & '60's that used the frame of one manufacturer and the engine of another?

The Triton motorcycle was not a factory production British bike of the 1950's & '60 but an enthusiast's creation using the 'Featherbed' frame from a Norton and the engine from a Triumph, usually a 650cc twin carburettor version, for enhanced performance. New engine mounting plates had to be manufactured, usually of polished aluminium to give a nicer aesthetic look. Many chrome plated cycle parts were used and non standard, large capacity, fuel tanks were also made.

The Norton Featherbed frame was proven on the race tracks for outstanding handling and roadholding and was available in slim-line or wide-line variants.

The twin cylinder Triumph Bonneville engine was also well proven for high performance and reliability, simple in operation and readily available spare parts.

The Squariel was the term used for an Ariel Square Four, using revolutionary 500, 600 & 1000cc engines designed by Edward Turner of Triumph fame.

The Black Shadow was one of the models in the Vincent range, a V twin 1000cc engined bike and famous for its 5" 150mph speedometer.

A Noddy bike was a somewhat derogatory name used for the Velocette LE motorcycle, used by Police in the U.K. It had a twin cylinder horizontally opposed, water cooled engine, which gave almost silent running and allowed police riders to approach lawbreakers without being heard.