Tempo, equal to that of the aero Ford Thunderbird. The four door returned a drag coefficient of 0.37. The Tempo was designed for a four cylinder engine, but all production of Ford's 2.3 L Lima OHC four was committed to other product lines. In 1983 Ford had stopped production of their 200 cubic inch Thriftpower inline six, leaving unused capacity at the Lima Engine plant. Ford developed a four cylinder engine that shared some features of the Thriftpower six, topped with a new cylinder head and using other new technologies, while repurposing as much tooling as possible at the Lima plant. When the cars were released, a turbocharged version of the new four cylinder was said to be in development, but this engine never became available. At that point, a V6 was not being considered. Released in 1983 as a 1984 model, more than 107,000 two-door Tempos and more than 295,000 four-door Tempos were sold in its first year. Features Chassis and suspension The Tempo's chassis is a steel unibody. The structure from the firewall forward is shared with the contemporary Ford Escort. The Tempo's front suspension on each side comprises a lower lateral link triangulated by the anti-roll bar and a coil over MacPherson strut. The rear "Quadralink" suspension is two parallel lower lateral control links and a radius rod per side, with coil over MacPherson struts. This differed from the Escort's rear suspension, which used a lower lateral arm, radius rod, and non-concentric coil spring and shock absorber. The Tempo was the first ever American built Ford with an independent rear suspension using MacPherson struts. Brakes are discs in front and drums in back. Steering is by power assisted rack and pinion, with three turns lock-to-lock. Standard tires on base models are 175/80R13, while higher trim levels have 185/70R14, and sportier models are fitted with Michelin TRX 185/65R365 metric tires on aluminum wheels. Powertrain The Tempo's four cylinder gasoline engine is called the "High Swirl Combustion" (HSC) engine and displaces 2.3 L. It has a cast iron block and head, with a single cam-in-block and two overhead valves (OHV) per cylinder with pushrods and rocker arms. The HSC engine was also offered in a "High Specific Output" (HSO) version producing . In 1992 the 3.0 L Ford Vulcan V6 engine became an option in the Tempo. Fitting the Vulcan V6 into the Tempo required changes to the water