Two further generations of the Sierra RS Cosworth were built over the years, though neither is nearly as well-known as the first. The third-gen model, the Sierra RS Cosworth 4x4, was built in the early 90s and had an AWD drivetrain. The Ford Escort RS Cosworth, hailing from the mid 1990s, has become a highly collectable and expensive piece of Escort kit. The Escort RS Cosworth was in production between 1992 and 1996, with a total of 7,145 units built. The BDA Engine: A Weapon Made For RacingA BDA Cosworth Engine pulled from a Ford Escort RS1600.