After twenty years of turning ordinary sedans into rally and race winning machines, just accessible to ordinary citizens but coveted as supercars by the general public, Ford was not going to have an easy time improving its game. But in 1985, it created what has arguably become the most iconic fast Ford of all time, the Sierra RS Cosworth.
The less-than-subtle Sierra Cosworth wasn’t just a wild-looking road car, it was a car designed and built to win races. Group A regulations in the 1980s required 5,000 units to be built to homologate a car and allow it to compete, so in the tradition it had established with the Lotus Cortina and the Escorts RS, Ford took its then-unloved Sierra and adapted it for competition.
Despite the monumental wing protruding from its tailgate, the most important part of the Sierra was its 2.0-liter turbocharged four-cylinder engine. That’s why the name Cosworth, the name of the engineering company that developed the engine, was incorporated into the car’s official name.
The Sierra’s formula was no different than the previous homologation Escorts, Cosworth created a new cylinder head for one of Ford’s existing engine blocks to make it much more powerful.
The cast iron block from Ford’s single overhead cam engine, the T88 Pinto used in the Escort RS2000, was used as the basis for the Sierra’s new engine, called the YB. Cosworth designed an aluminum cylinder head to fit the Pinto block, with two belt-driven cams operating 16 valves, eight 35mm diameter intake valves and eight 31mm exhaust valves. Then, because it was the 1980s and fashionable at the time, Cosworth engineers added a turbocharger, a Garrett AiResearch T3, and an intercooler that boosted power to 204 hp at 6000 rpm and 205 lb-ft at 4500 rpm. This was in the road version, while in the race version, the first engines produced about 375 hp and this figure quickly increased.
Coupled with a five-speed Borg-Warner transmission, the Cosworth YB engine transmitted torque to a rear axle equipped with a viscous-coupled limited-slip differential. With 204 hp, the Sierra could accelerate from 0 to 100 km/h in 6.2 seconds and reach an official top speed of 240 km/h.
This example is from France is in very good original condition and runs perfectly. The 89,000km are real. The bodywork is flawless and the undercarriage is also in very good condition. The complete maintenance has just been done, the car is ready to drive! It is equipped with a sunroof.
1 year warranty