A Scania engine delivers high torque with good fuel economy and low exhaust emissions. Achieving this high level of performance without sacrificing driveability requires advanced combustion technology. There has to be a fine balance of all parameters to create the right conditions for optimised output. Much of that balance concerns the volume, timing and pressure of fuel injection.

Precision that gives consistent, economic performance
With unit injectors, the engine always has exactly the right amount of fuel introduced at exactly the right moment, at exactly the right pressure. Combustion in each cylinder is individually controlled, by varying the beginning and end of the injection process – thus minimising fuel consumption and emissions.

Precision that makes a difference for the driver
As a driver, you’ll find that engine speeds are more stable when manoeuvring in traffic or at low speeds, for instance in tight parking areas. 

Reliability that’s based on simplicity
Each unit injector has its own integral high-pressure pump, individually controlled at the point of injection. There is no need for a centralised high-pressure pump and a complex system of pipes to feed each injector.

This, in turn, makes the system inherently more reliable than previous solutions. Should a malfunction occur, it will almost certainly be present in only one cylinder. This means that your bus or coach is very unlikely to be disabled. Functional testing, using built-in diagnostics, takes no more than a few seconds and can be completed by a Scania technician at the roadside, if necessary.