MultiAir technology is highly flexible in terms of application to internal combustion engines and permits optimisation of performance according to specific profile of use. These characteristics make it extremely interesting also as regards application to more than 1-litre ‘Heavy Duty’ diesel engines adopted on both commercial and ‘off-road’ vehicles (agriculture and earth-moving machines sector). To gear to the ever tighter future regulations that will be applied to Heavy Duty engines, both on-road (Euro VI and EPA 10) and off-road (Stage 3B / Stage 4 and Tier IV) and, in particular, to the need to comply with NOx emission restrictions, which will be reduced by 80% in relation to the current limits, application of MultiAir technology is being studied in order not to penalise engines in terms of consumption and running costs. Application of MultiAir technology to the intake valves of Heavy Duty diesel engines will make it possible to enable functions able to trim urea consumption (necessary for functioning of the SCR system) with a potential maximum reduction of around 4%, a highly significant trade-off in economic terms, in particular for the ‘off-road’ sector. Primarily, the MultiAir system guarantees a major percentage of internal EGR (Exhaust Gas Recirculation) which promotes an around 2% reduction in consumption, with the same emissions. Flexible control of the air of the intake valves can promote a further 2% reduction in consumption through more efficient control of exhaust fume temperature and application of the Miller cycle. In 2009, a project was launched for application of MultiAir technology to an FPT engine of the Cursor family, with the aim of verifying these potential benefits by the end of 2010. Amongst others, the application has been designed so as to guarantee complete compatibility also in the CNG version of the engine, on which the benefits resulting from use of the MultiAir system have been amply demonstrated.