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Unit injectors look set to do battle against common rail as the fuel system of choice for trucks.
Among truck and bus engine manufacturers, opinion is divided on the way forward for diesel fuel systems. The engine makers have effectively grouped into what can now be called the `common rail' and the `unit injector' camps. Each is convinced that the future lies unquestionably with its chosen technology, and that the rival concept is destined for the dustbin of history.
On small car and van-sized diesels, the virtues of common rail are widely accepted (Volkswagen being the exception). In the face of its competitors' criticisms, VW sees the electronic unit injector (EUI) as the diesel fuel system which will pave the way to Euro 4 and Euro 5 emissions law compliance 2005 and 2008 respectively.
With heavier-duty diesel engines of, for example, one litre per cylinder swept volume or more powering trucks of around 7.5tons GVW and above, …