America's Definitive Marine Engine Magazine

marine engine digest logo

Mercury Racing

Merury Racing 9.0L V8 1300 hp

Mercury Racing's 9.0 Liter V8 Engine Rated 1300 and 1350 Horsepower

With a 552 cubic inch displacement, the monster motor's build list includes 32 valves, four camshafts and a dry oil sump. Twin turbo chargers jam air into each bank of cylinders via electronically actuated waste gates. Pulse-tuned exhaust scavenges the cylinders clean and minimizes back pressure. The black box boasts 10 times the computing power of previous modules. Even with a low 7.8 to one compression ratio, the bi-turbos require 91 octane fuel.

Mercury Racing's 9.0-L An All-Aluminum Turbo-Charged V-8 CAD/CAMed From A Proverbial Clean Sheet Of Paper

To handle the massive torque Mercury Racing built an all-new, surface-piercing stern drive and dry-sump hydraulic transmission. Dubbed the M8, the drive features forged gears as well as robust shafts and bearings. Twin pinion gears share the load and synergistically allow a narrower, more hydro-dynamically efficient gear case profile. The M8 is 5 times stronger than a Number Six drive.

mercury racing M8 drive

In spite of race motor DNA, the 9.0 liter is a green machine. It's 20- to 30-percent more fuel efficient than similar engines and it meets EPA and CARB emissions requirements. When the engine gives up the ghost 95 percent of its parts are recyclable. Finally, the engine has already found a happy home in Cigarette Racing's 46 Rider.

Mercury Specifications:
Cylinder Configuration V-8
Displacement 9.0 L / 552 CID
Bore x Stroke (inches) 4.57 x 4.21
Compression ratio 7.8 to one
Redline 6,500 rpm
Horsepower 1300 Ambient air
1350 Direct air
Fuel 91-Octane Gasoline
Operating range 6000-6500 rpm
Alternator output 105-Amps
(Engine, transmission and drive)
1720 pounds
Warranty term One-year limited