Designed, developed and manufactured in-house, the naturally aspirated, 4.6 Liter V-8 four-stroke engines share Mercury Racing’s venerable Quad Cam Four Valve (QC4) sterndrive DNA – complete with aluminum four-valve cylinder heads and dual overhead camshaft (DOHC) valve trains.
The four valve heads and DOHC valve train is integrated with Mercury’s proprietary V-8 cylinder block, packed with high performance hardware. The new platform replaces the two-stroke V-6 250XS and 300XS models.
No Replacement for Displacement
The stout V-8 powerhead provides an astounding 53% increased displacement compared with the 250XS and 44% more displacement than the 300XS resulting in 40% higher overall bottom- end torque compared to the legacy two-strokes.
Transient spark calibration boosts torque by 7% for unmatched acceleration. Advanced Range Optimization automatically adjusts fuel delivery for up to 10% improvement in cruise-speed fuel efficiency. All of this on 87-octane (90 RON) pump fuel while maintaining a comparable weight to the legacy two-stroke 250 XS and 300 XS models. Best of all, the new 250R and 300R models are backed by a three-year factory warranty.
Most Versatile Performance Outboards on the Market
The 300R is highest performing engine in its class. The powerhead features custom Racing intake cam shafts and an exclusive short runner intake manifold. An integrated oil cooler keeps oil temps down throughout the 300R’s higher 5800-6400 rpm operating range.
The 300R is available with either mechanical or digital control systems. In addition, two midsection (Tri-Ram and heavy-duty HD) and three gearcase (Sport Master, Torque Master, and 5.44” HD) options ensure compatibility with any boat that needs to go fast.
Factory rear tie-bar models are available for enhanced stability on high speed multiple engine catamaran and offshore center console applications. An optional side steering bracket kit is also available.
The 250R is available with a mechanical control system. It features the Tri-Ram midsection and the surface piercing Sport Master gearcase. Designed for boats capable of speeds in excess of 85 mph, the Sport Master features low water pick-ups and a crescent leading-edge for maximized efficiency.
An optional Graphite Grey accent panel is available as a kit. A paint-ready kit is also available to custom match the engine to the boat.
Hand Crafted Propellers
A full arsenal of custom Mercury Racing propellers are available to maximize performance in any application
See your local Mercury Racing dealer to Revolutionize your ride with a new Mercury Racing V-8 FourStroke outboard!