Mercury 115 HP EFI Fourstroke - The Best engines deserve the best installation, setup, prop selection and height, for the right advice and the best deals on the full range of Mercury four stoke Outboard engines contact the multi award winning team at Hitech Marine
Get the confidence, fuel economy and power to Go further and more often when you "Do it Once - Do it Right" with Hitech Marine

Check out the impressive Performance and Fuel Economy specifications on some of the boats Hitech Marine have powered with this engine...
   Atomix Boats Model 560 - 5.6 metre Fibreglass family, fishing and offshore boat...

Why choose a Mercury 115hp Four Stroke engine?...

Mercury 115 hp Four stroke weight comparison

Mercury’s world-renowned engineering team has packed incredible power into these lighter, compact four-cylinder single-overhead-cam engines.
The 115hp weighs 20 pounds less than its closest four-stroke competitor, making it the world’s lightest low-emissions outboard in its power range.

Dry weight specification is for the lightest-version model. Comparative weights refer to base engines without oil,
propeller or integral steering cylinder. Weights based on Owner’s Manual specifications.


Less weight and high displacement mean Mercury’s new 75 - 115 Four-Strokes generate abundant torque and immediate power.

Because they don’t have to work as hard as heavier engines or those with lower displacement, these engines make boats plane
faster, accelerate better and provide optimal fuel efficiency at cruising speed.


Best Corrosion Protection 

Low Copper Alloy

True Corrosion Protection starts with the alloys.
Mercury manufactures its own aluminium-silicon alloy and custom designs it to ensure the lowest effective copper content.

XK360 - <0.20% Copper Content
The most corrosive resistant alloy on the market today and it is a Mercury Exclusive. Used only on Die Cast components like: engine blocks, cylinder heads, gear cases, drive shaft housings and stern drive units

A356 - <0.15% Copper Content
Used in Lost Foam components or permanent mould castings Used on blocks, heads, clamp & swivel brackets

MercAlloy - <0.20% Copper
Very costly – but provides superior impact protection Used only on Die Cast components: on large outboard Drive Shaft Housings and most of Mercury’s Aluminium Props


HP / kW

  • 115 / 84.6
Engine type
  • 8-valve single overhead cam (SOHC)
  • Inline 4
Displacement (L)
  • 2.1
Full throttle RPM
  • 5000-6000
Air induction
  • Performance-Tuned Scroll Intake Manifold
Fuel induction system
  • Computer Controlled Multi-Port Electronic Fuel Injection (EFI)
Alternator amp / Watt
  • 35 amp / 441 watt with water-cooled voltage regulator
Recommended fuel
  • Unleaded 91 RON Minimum
Recommended oil
  • Mercury FourStroke Oil 10W-30
Engine protection operator warning system
  • SmartCraft Engine Guardian
Compatible with SmartCraft digital technology
  • Yes
  • Smart Start Electric
  • Mechanical throttle & shift
  • Big Tiller Compatible
  • Dual Cable Mechanical
  • Hydraulic power steering
Shaft length
  • 20" / 508 mm
  • 25" / 635 mm
Gearcase ratio
  • 2.07:1
Dry weight *Lightest model available
  • 359 lbs / 163 kg
Emissions Star Rating
  • 3
Bore and stroke
  • 3.5 x 3.2" / 90 x 81 mm
  • SmartCraft ECM 70 Digital Inductive
Fuel system
  • Electronic Fuel Injection (EFI)
Cooling system
  • Water-cooled with thermostat
Gear shift
  • F-N-R
Gearcase options
  • Standard
Trim system
  • Power Tilt
  • Power Trim
Exhaust system
  • Through prop
Shallow water trim range (degrees)
  • 20
  • Phantom Black
Lubrication system
  • Integrated Dry Sump
Oil Capacity
  • 5.5 qts / 5.2 l
Maximum Trim Range
  • 22° (-6° to 16°)
Maximum Tilt Range
  • 70° (-6° to 64°)

For more information, the right advice & the best Mercury Engine deals, see the certified team at...

Hitech Marine Mercruiser Engine Experts
Do it Once - Do it Right


Horse Power (hp)
  • 115

Engine 1

Engine Make Mercury
Horse Power 115


Download Performance/Fuel economy Spec of an Atomix 560 hull Powered with this Mercury 115 Outboard