Cosworth Engineering increased its association with Ford in 1969 by developing a DOHC 16-valve four cylinder locomotive for route consumption in the Escort. Base from the Kent X/flow block, Cosworth created a 1,601 cc (80.96m.m.x125.2m.m.) for homologation purposes. The twin camshafts were driven by a toothed belt, hence the figure BDA (Belt Drive A-Series). Running in Group 2 and Group 4 on either rallying or touring automobile racing, this engine could be expanded to a maximum of 2,000 cc (120 cu in.) The nominal homologation at 1,601 cc. capability (in fact the engine displaced somewhat little than 1600cc) meant that BDA-engine cars competed in what was normally the best course (1600cc and upward) then were qualified for utter victories quite than course wins.In 1970, the BDC development received fuel injection for the best moment. Two years subsequently, the BDA series was being used in Formula 2, first at around 1,840 cc., until reaching a maximum of 1,975 cc in 1973, as the developed BDG kind of the engine, which too received an aluminum block.The block could too be abbreviated, starting with the 1,599 cc Formula Atlantic engine in 1970, followed by the 1,100 cc and 1,300 cc variants for SCCA club race and sports automobile racing.In the 1980s the BDR 1,700 cc., used in the road-going edition of the Caterham , and the 1.8 L BDT, which powered the never raced Escort RS1700T and the more aggressive Ford RS200, which was created for Group B rallying. A 2,137c.c. development example was developed by Brian Hart just as Group B was cancelled by the FIA. The BDT-E turbocharged versions gave over 600 bhp (450 kW) in Group B rallycross shape.In 1970 Ford asked Weslake and Co of Rye to construct the BDA Engine for them and by the conclusion of 1970 the output cable had been installed at Rye and output was under manner. The Hart 420R owes more to the BDA series, being basically an aluminum-block derivative using related cylinder heads.