It is a production engine that Ford used in the Escort. Cosworth was involved in developing the engine for racing. They eventually coaxed 272 bhp out of this little beast.
Originally conceived by Mike Hall (Cosworth Engineering) as a belt driven version of Cosworth’s FVA power plant, this engine is based on the Ford 1600 X/Flow bottom end.
It made its first appearance in the Mk1 Escort in 1970 and replaced the Lotus twin cam engine as the new high performance engine for the Ford Rally Sport models. During the early seventies Brian Hart (amongst many others) developed this engine further and his 87mm big bore alloy block version, giving an increased capacity to 1840cc, was eventually adopted by Ford and used to power the later RS1800 Escort.
The BDA and all its derivatives went on to dominate the motorsport scene and even today, 30 years on, it is still providing many winning cars with their power. At least 15 types have been produced ranging from the 1098cc BDJ (150bhp) through to the 2 litre BDTE turbo version (650bhp in full race trim) which was produced with a slightly longer block to improve its structural strength.