Buslovers Scania XPI
Conditions may change, but performance and fuel economy don’t have to.
With Scania XPI (extra-high pressure injection), fuel delivery and injection pressure can be set independently of engine speed, with exceptional precision. This sophisticated system adjusts continually to adapt to changing speeds and situations, so you can get the most from every drop of diesel. It uses up to three precisely timed fuel injections to enhance performance and economy – while reducing harmful emissions – through every cycle.
The Scania HPI (High Pressure Injection) system makes continual, precise adjustments to ensure optimal fuel delivery in all conditions. It is able to vary the volume and timing of injection, thus minimising fuel consumption and harmful emissions without restricting torque build-up.
PDE unit injectors deliver the right amount of fuel at the right instant – with precisely the right pressure. Combustion in each cylinder is individually controlled to minimise both fuel consumption and harmful emissions. As a driver, you’ll find that engine speeds are more stable when manoeuvring in heavy traffic or when crawling along in tight parking areas. 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.source scania.com
Each new engine starts with the creation of an optimised single cylinder unit. Variations in aspects of the design are evaluated and refined, leading to power outputs with the most desirable characteristics.
In the course of researching various single-cylinder engines of different displacements, it has become apparent that cubic capacity itself is a critical factor. Quite simply, the potential for optimisation – excellent fuel economy, low emissions and generous torque – is at its greatest when the physical dimensions of the bore and stroke are within certain critical limits. This has led to the development of the Scania modular combustion concept.
Although overall engine designs have evolved over decades, all Scania engines currently in production are based on this advanced concept. These engines have identical combustion chambers and also share components such as pushrods, valve gears, roller tappets and piston rings. This makes them not only efficient, but also exceedingly simple to maintain and repair.
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