P1 SuperStock Repowers with Mercury Racing

The new 300R replaces the legacy 300XS OptiMax as the exclusive power for the series’ domestic and international venues.

We are excited to announce the Powerboat P1 SuperStock outboard racing series is repowering for the 2019 season with the all-new 4.6L V-8 four-stroke 300R outboard. P1 SuperStock, presented by Mercury Racing, is a one-design, single-engine race series.  The new 300R replaces the legacy 300XS OptiMax as the exclusive power for the series’ domestic and international venues.

Designed, developed and manufactured in-house, the naturally aspirated four-stroke 300R shares Mercury Racing’s venerable Quad Cam Four Valve (QC4) sterndrive DNA.

The stout V-8 powerhead provides an astounding 44% in increased displacement compared to the legacy two-stroke 300XS. That, combined with four valves per cylinder and the DOHC valve train, enables the new 300R to generate unprecedented torque and unmatched acceleration from the lower end of the power band up to maximum engine speed. All of this on 87-octane (90 RON) pump fuel while maintaining a comparable weight as its two-stroke predecessor. The weight savings can be attributed to the state-of-the-art powerhead components including composite intake runners.

Rear tie-bar 300R models feature the heavy duty midsection with a factory installed tie-bar mounting plate.

Two midsection and three gearcase options are available for the 300R. P1 SuperStock will feature 300Rs with the Heavy-Duty midsection with a factory installed rear tie-bar mounting plate and side steering bracket assembly. The Heavy-Duty midsection features solid mounts and robust, forged transom brackets with single ram power trim and a remote trim pump designed to endure the harsh offshore environment. The side steering bracket provides a robust, integrated steering installation.

The surface piercing Sport Master gearcase features low-water pick-ups and a crescent leading-edge for maximized efficiency and speed.

The surface piercing Sport Master, designed for boats capable of speeds in excess of 85 mph, features low-water pick-ups and a crescent leading-edge for maximized efficiency and speed. All boats are equipped with hand-crafted Mercury Racing Rev 4 XP propellers for precision matched race competition.

The 300R is backed by a three-year factory warranty with up to three years of Mercury Product Protection for a possible six years of warranty when used in recreational boating applications.

P1 SuperStock CEO Azam Rangoonwala said, “The P1 Panther race boat is at the heart of our SuperStock championship and strategic partnerships are an integral part of our business model, so the relationship with Mercury Racing is hugely valued. Embracing the latest technology by upgrading to the 300R outboard will not only increase racing performance but also maintain parity within the series.”

“We are very excited to continue our presenting sponsorship of the P1 SuperStock Championship. Their professionalism and focus is second to none,” said Stuart Halley, Racing’s General Manager.

Steve Miller, who oversees Racing’s marketing, sales and service said, “It is exciting to have our consumer products used in this highly competitive, one-design racing environment. There is no better way to prove their performance and durability.”

The 2018 P1 SuperStock USA Championship season finale is June 30-July 1 at the 34th Annual Sarasota Grand Prix Festival, in Sarasota, Fla.

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4 thoughts on “P1 SuperStock Repowers with Mercury Racing”

  1. Repowering a 2007 Allison XB-21 2+2 with a 300R.
    Best prop I found for my 225 Sport XS 1.62 was a ProMax 26P.
    I have a ProMax 27P the 225 couldn’t handle. Thought
    it could be a good place to start on the 300R.
    What do you think will be the best prop to run in my application?

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