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Twinport technology builds on the standard four-valve technology of ECOTEC engines. Savings are achieved via a variable intake manifold in combination with a high rate of exhaust gas recirculation. Under partial load the engine receives an additional 25 per cent of its fuel air mixture from the already burnt exhaust gas recycled back into the mix.

The advantages of twinport technology are achieved through a combination of fuel injection and exhaust emission control by three-way catalytic converter technology. This reduces technical complexity and consequently the cost to the customer, making the twinport solution particularly attractive for compact-class cars, as power output and efficient fuel consumption are maintained.

Average fuel consumption of the new twinport engines is remarkably low. The 1.0 litre engine when fitted in the Corsa achieves 49.5 mpg on a combined cycle, while the larger 1.4 90 hp unit returns 44.5 mpg – using nearly 13 per cent less fuel than its predecessor with a five-speed gearbox.

When combined with the Easytronic transmission the new 1.4 twinport engine achieves savings of over 23 per cent compared with the current model

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