Listen to the unique AC Aceca prototype on the road.
The prototype uses the 2-litre, in-line six, 100D2 Bristol engine, fitted by AC from March 1958. Breathing through 3 Solex Downdraft Carburettors The 100D2 is considered the most desirable of the Bristol engines and puts out 128bhp @ 5750rpm.
Interestingly the engine sits several inches further forward in the prototype than in the standard Aceca. Because of this, the car uses a ‘remote’ gear change linkage, as used by Frazer-Nash. The engine drives through a four-speed gearbox with overdrive, linked to a GKN differential.
Behind the Aceca Prototypes wire wheels sit disks at the front and Alfin (Aluminium finned for improved cooling) inboard drum brakes at the rear. The suspension is coil-sprung, wishbones all around (later seen on the AC Cobra 289). Another quirk unique to the prototype is that it uses a Triumph Herald steering rack (also launched in 1959).
The Aceca’s aluminium body panels are hand-formed over a tubular-steel framework. The doors and tailgate are timber framed. The tailgate design is more early hatchback than coupe, a feature it shares with the 1953 Aston-Martin 2/4. The fuel tank is mounted between the back axle and the back of the seats, providing excellent (near 50:50) weight distribution.