Mercury Racing has announced the OptiMax 2.5XS outboard, the first of its new generation engines to replace the long-serving 2.5 EFI series, which has dominated high performance competitions but is to be discontinued next year.

The low-emissions Mercury OptiMax 2.5XS is a 2.5-litre V6 mounted on a 20" (508mm) 3.0-litre centre section and Sport Master or Torque Master gearcase. The compact direct-injected V6 power head saves weight on the overall package, enhancing boat performance and fuel economy. Full throttle is in the 6100-6800 RPM range.

Mercury's exclusive PCM 03 microprocessor optimises fuel, spark timing and knock control for each cylinder independently. It also operates the electronic multipoint lubrication. A SmartCraft control area network (CAN) system proactively monitors and controls multiple engine functions and enables the PCM 03 microprocessor to provide real-time engine function data to SmartCraft accessory gauges, including speed, RPM, engine trim level, fuel consumption and range.

OptiMax uses a two-stage direct fuel injection process. A burst of air at 90 psi shoots through the petrol, breaking it into a fine mist. The mist creates more surface area for combustion, stays suspended in the cylinder longer, and results in a more consistent and complete burn. The OptiMax 2.5XS has a higher air-to-fuel pressure differential than standard production models.