Black Label long chassis models came with twin SU carburetors and a 5.1 to 5.3:1 compression ratio producing 110 bhp - 130 bhp depending on application - resulting in 100+ mph top speed with the cycle wing Vanden Plas bodied Le Mans replicas.
10 short chassis models - were fitted with short chassis and a lightweight body. One of - if not the largest 4 cylinder engine built.
55 Supercharged "Blower" models produced without W.O Bentley's sanction, in a separate workshop under the initiative of one of Bentley's backers. These cars produced 175 bhp and whilst fast were also undeniably fragile, which is reflected by this high profile model's lack of competition success in period.