In 1959 Geoff Healey set out on an expedition to the Bonneville Salt Flats in Utah, USA to attack some international class records as a publicity exercise. They took two cars for the attempt, one of which was “based on an MGA chassis frame and fitted with a blown 950cc Sprite engine….The engine was blown by a Shorrock supercharger, a creation of Noel and Chris Shorrock, an eccentric vane type…” This, a quote from Geoff’s book “More Healeys”. He goes on to say: “To obtain the additional power required for these high speeds an ordinary ‘Shorrock’ low pressure, belt driven, super-charger
kit is fitted. This gives a manifold pressure of 6 to 7 lbs per square inch and the engine will produce 78 bhp at 5500 rpm or 86 bhp at 6000″.
So began the supercharging of Sprites and this is the reason the name Bonneville Sprite was associated with cars fitted with the Shorrock supercharger. These cars usually had the wire wheel conversion with Girling disc front brakes and 8″ rear drums making them also ‘Sebring Sprites’. It is belived that the “Supercharged” badge came with the Shorrock kit for Sprites.
Below are a number of brochures and articles relating to the installation and maintenance of the Shorrock C75B on the Austin-Healey Sprite:
Brendan’s Shorrock within his MKIIa sprite
more info can be found at http://www.shorrocksuperchargers.co.uk/