A Boating professional opines on this new Mercury Racing outboard. 2 stroke vs 4 stroke
Mercury Racing turns up the quantity on outboard overall performance with its new 450R version, a 4.6-liter V-eight with a supercharger gadget.
This excessive-performance outboard supersedes, however will now not replace, the popular Mercury Racing 400R version. Mercury Racing claims the 450R cranks out 450 prop-shaft horsepower and 439 foot-kilos of torque burning 89-octane gasoline—forty percentage more torque than the Mercury Racing 400R. yet at 689 pounds, the 450R weighs just 21 kilos extra than the six-cylinder 400R.
You’ll pay for that power. Pricing for the 450R levels from $54,000 to $64,000, relying on equipment case and different options—about 50 percent more than the Mercury Racing 400R. Availability of the 450R will be constrained for the the rest of 2019, with manufacturing earmarked for overall performance boatbuilders, and few left for repower installations via sellers.
At a demo consultation prepared with the aid of Mercury we had a chance to run the Mercury Racing 450R on a variety of boats from formulation, MTI, Nor-Tech, Mystic, Cigarette and Sea Ray, and to speak to reps from the ones manufacturers who could examine the performance of the 450R to that of the 400R at the equal boat version. All said an growth in top speed, from 5 to ten mph, and all raved about the snappy mid-range punch of the new motor.
“The 400R starts offevolved out robust, however then seems to kind of run out of breath as you increase velocity,” says Mike Griffiths, who was manning an MTI 340X cat. “The 450R’s torque starts early and remains linear. This motor pulls difficult all the way to wide-open throttle.”
commercial
The 450R is based on the evidently aspirated Mercury Racing 300R outboard, which in flip has its foundation in the 4.6-liter double-overhead-cam, 4-valve sixty four-degree V-eight platform used across 4 Mercury outboard series: Verado, FourStroke, pro XS and Ocean seasoned.
“This whole platform has been in development on account that 2013, and the Mercury Racing model of the four.6-liter V-eight turned into constantly part of the program,” says Mercury Racing head engineer Jeff Broman. “Mercury certainly is aware of how to supercharge an outboard, in order that component of the venture was not a substantial mission. The toughest mission become fitting our supercharged powerhead underneath the same slim-line cowl used for the usually aspirated versions of the V-8.”
The 450R functions cast pistons, a excessive-overall performance intake cam profile, and race-spec Inconel exhaust valves. A 2.four-liter belt-driven dual-screw supercharger is water-cooled to lessen the temperature of the consumption air. dual rate-air coolers lessen the temperature of the compressed intake rate. The supercharger and fee-air coolers occupy the space filled by means of the intake tract on the normally aspirated V-8s. A skip valve automatically adjusts maximum improve strain in response to converting ambient situations. A excessive-ability oil cooler and a poppet valve inside the middle offer an on-demand higher quantity of cooling-water waft to help manage improved engine warmth. tools-case alternatives include the Mercury Racing sport grasp for boats able to speeds over eighty five mph—now with a brand new one-piece 1.25-inch-diameter 2b4ddebc610f0ebc488d9c02eb20a2e5 prop shaft—and the 5.forty four HD for lower-pace and conventional submerged packages. each tools cases have a 1.6-to-1 equipment ratio. The extensive-open-throttle operating variety peaks at a beneficiant 5,800 to six,400 rpm, a vast window for propping alternatives. The 450R will be offered in 20-, 25- and 30-inch shaft lengths.The 450R has the Verado-fashion advanced midsection (AMS) with 2b4ddebc610f0ebc488d9c02eb20a2e5 manual plates and stiffened engine mounts for stepped forward engine stability and high-speed handling. The AMS has an indispensable tie-bar mount, and allows optionally available Joystick Piloting for Outboards (JPO) for boats rigged with two to 6 outboards. different capabilities carried over from the base four.6-liter platform consist of a a hundred and fifteen-amp alternator to address big audio structures and energy-hungry angling add-ons, the Idle rate battery-management device that bumps up idle rpm while it senses low battery voltage, and preprogrammed transient Spark technology that adjusts timing improve for stronger hollow-shot performance. Adaptive velocity control with a Mercury Racing calibration routinely holds engine rpm no matter load or condition. The pinnacle cowl carrier Door makes routine engine-oil assessments a breeze.
See how the 450R performs when mounted aboard a ship!
It’s magnificent that this high-overall performance outboard is subsidized by using a 3-yr constrained factory warranty and a 3-12 months limited corrosion assurance —similar to the plain old Mercs. shade alternatives encompass cold Fusion White with satan crimson Eye cover accessory panels and Phantom Black with Graphite grey cover accents. A carbon-fiber and paint-ready accent accessory panel package could be to be had to custom-in shape a 450R outboard to a ship’s coloration scheme. 2 stroke vs 4 stroke