Barrus are pleased to announce the introduction of the next generation of Mariner and Mercury OptiMax engines launched at Miami Boat Show.

The enhancements to the twelve new models that range from 75 to 300hp, concentrate on key customer attributes including durability, reliability, noise, vibration and harshness (NVH) and overall ease of operation. While each of the 1.5, 2.5 and 3.0 litre engine groups have undergone changes, the most dramatic differences are in the 3.0 litre models that range from 200 to 250hp.

A noise level reduction of up to six decibels has been achieved in the 3.0 litre group and the other significant change is the adaptation of the gear case that was designed for the supercharged four stroke Verado. The gear case features a very robust construction and higher blow out speeds than the Fleet Master gear case currently used by the 3.0 litre family. This gear case was designed to withstand the harsh operating conditions that outboards have to contend with especially in rough seas. Although the gear case itself will change, the 3.0 litre OptiMax family gear ratios will remain the same. These ratios allow for the widest propping alternatives to meet any boating application.

Another key element to the next generation of OptiMax engines is a new cowling on the 2.5 and 3.0 litre models that features an innovative air intake with aggressive curves for improved aesthetics.

The new OptiMax will feature the next generation propulsion control module (PCM). The Motorola designed PCM completes millions of calculations each second, controlling everything from oiling ratios to injection timing. The PCM also houses the powerful Engine Guardian Software, which monitors all engine functions for faults.

The exclusive SmartCraft technology will also get an upgrade on the new OptiMax engines. One added feature is the Descriptive Text, an enhanced information protocol between the engine and the operator. This will provide the operator more detailed information about any engine faults or warning horns by displaying the information on the face of a SmartCraft gauge.

Fuel economy, one of the greatest strengths of OptiMax, remains excellent with the new engines. In general, a consumer can expect to use up to 45 percent less fuel than with a traditional two-stroke engine of the same horsepower. OptiMax has also established its fuel economy excellence when put up against the industry’s four-strokes.

Production of the new OptiMax engines will commence towards the end of summer 2006.