Although Saab engineers liked the company's existing two-stroke engine, it was decided that a four-stroke engine was necessary, and the choice was a 1.7 L (later 1.85 L) engine from Triumph. This was the same Triumph Slant-4 engine used in the Triumph Dolomite, but the Saab version was fitted with a Zenith-Stromberg CD carburetor developed specially for Saab. A number of Saab 99s were equipped with a Triumph Stag V8, but the V8 was later dropped in favour of a turbocharged unit which later powered the 99 Turbo.