The care taken over the detailed design of the new engine was rewarded with a power unit which earned widespread respect in the industry and, at least with the Kadett A, tended to outlive the rest of the car in which it was fitted. In later incarnations both the 1.0 litre unit and an enlarged 1.2 litre version were still used in small Opels, including the first Opel Corsa (and Vauxhall Nova) well into the 1990s.
The Opel Karl is powered by a new 1.0-liter turbocharged Ecotec three-cylinder making 74 hp, a bit less than the outgoing Chevrolet Spark’s 84 hp from a 1.2-liter four-cylinder. The three-cylinder engine is part of GM’s new global, small-displacement Ecotec engine family, so it’s possible that Chevrolet may offer a slightly larger turbocharged engine for the Spark in the U.S. The European-market Opel is also available only with a five-speed manual, while the Spark will almost surely be offered with an automatic transmission option.
The Calibra holds the title of having been the most aerodynamic car in the world at its 1990 launch, with a drag coefficient of just 0.26. With engines ranging in displacement from 1998 cc to 2498 cc, the car reigned supreme over other makes at the time. Its privileged position as the most aerodynamically efficient car would be held until the end of the 90's when the Calibra was overthrown by new Audi and Honda releases, the A2 and Insight respectively.
The Insignia flagship followed exactly the same initiative as the Astra. Once again the Opel engineers’ main objective was efficiency. Thanks to optimized packaging and lightweight materials they could save up to 175kg on the Insignia Grand Sport compared with its predecessor – much to the benefit of dynamics and fuel consumption. Depending on powertrain and equipment, the current Insignia Sports Tourer even weighs up to 200kg less than the similar model variant from the first generation.
The GSi's engine mapping had been carried out by Opel tuning specialists Irmscher. A model with the 82 PS (60 kW) 1.4 L multi point fuel injected engine, which was otherwise mechanically identical to the GSi, also became available as the Nova SRi in the United Kingdom. In January 1988, a turbocharged version of the Isuzu diesel engine was introduced, with power increased to 67 PS (49 kW).[8] 
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