1982 Mercury 115 Hp Outboard Specs, The 1982 Mercury 115 HP outboard remains a respected model among boating enthusiasts who appreciate the blend of power, reliability, and vintage engineering. Known for its solid construction and dependable performance, this two-stroke outboard was a favorite for fishing boats, ski boats, and other recreational watercraft in the early 1980s. Understanding the 1982 Mercury 115 HP outboard specs can help owners maintain, restore, or compare it to modern engines.
Engine Overview
The 1982 Mercury 115 HP outboard was part of Mercury’s inline six-cylinder “Tower of Power” family, delivering impressive acceleration and top speed for its size. It featured a carbureted two-stroke design that relied on a fuel-oil mixture for lubrication, a common setup at the time.
Key Engine Specifications:
- Horsepower: 115 HP at the propeller
- Engine Type: Inline 6-cylinder, two-stroke
- Displacement: Approximately 99 cubic inches (1621 cc)
- Bore x Stroke: 2.875 in x 2.80 in (73 mm x 71 mm)
- Fuel System: 3-carburetor setup
- Ignition: Thunderbolt electronic ignition system
- Cooling: Water-cooled with thermostat control
Fuel and Oil Requirements
The 1982 Mercury 115 HP outboard specs called for a fuel mixture of gasoline and two-stroke outboard oil, typically at a 50:1 ratio. This ensured proper lubrication for the moving parts, especially important for the high-revving inline-six design.
- Fuel Type: Unleaded gasoline (minimum 87 octane)
- Oil Ratio: 50:1 (gasoline to two-stroke oil)
Performance and Propeller
With the right propeller setup, the 1982 Mercury 115 could push medium-sized boats to speeds exceeding 45 mph. Its power band was smooth, with strong mid-range torque ideal for towing water skiers or quick hole shots.
- Recommended RPM Range: 5000–5500 RPM
- Gear Ratio: 2.00:1
- Recommended Propeller: 3-blade aluminum or stainless steel, diameter and pitch dependent on boat type and load
Weight and Dimensions
The engine’s design was compact for its power output but still heavier than today’s four-cylinder models.
- Dry Weight: Approximately 300–315 lbs (varies slightly by shaft length)
- Shaft Lengths Available: 20″ (long shaft) and 25″ (extra-long shaft)
Maintenance Notes
Owning a vintage engine like the 1982 Mercury 115 HP requires proper upkeep. Common maintenance tasks include:
- Inspecting and replacing spark plugs regularly
- Flushing the cooling system after use in saltwater
- Checking lower unit gear oil at least once per season
- Cleaning and synchronizing carburetors
Final Thoughts
The 1982 Mercury 115 HP outboard specs reveal why this model remains a sought-after classic. Its combination of power, smooth performance, and iconic inline-six sound make it a nostalgic favorite. While it may not match modern engines in fuel efficiency, its mechanical simplicity and raw output continue to appeal to vintage boating fans.
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