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Mercury MerCruiser 8.1S Horizon (370-hp) main video
This is the big-gun in the Mercury MerCruiser line of recreational powerplants. It's designed to put real performance into mid-size express cruisers.

Key Features

• Mercury-exclusive PCM 555 high-speed microprocessor that optimizes fuel mixture, knock control and ignition timing independently for each cylinder, re
• Distributorless ignition system that improves timing accuracy and eliminates mechanical timing adjustments.
• Closed cooling with 5-year coolant.
• Redesigned exhaust system with aluminum manifolds and stainless steel elbows that is 65 percent lighter and more corrosion-resistant.
• Exclusive Engine Guardian protection senses potential problems and virtually eliminates the chance for engine damage due to overheating, low oil press
• Long individual runner intake manifold design provides optimum torque and horsepower for demanding marine applications
• Sequential fuel and spark control maximizes performance from every engine cylinder
• Convenient remote oil filter location makes oil changes cleaner and makes periodic service simple and less work
• Cartridge-type water-separating fuel filter helps protect fuel system and engine against damage

Mercury MerCruiser 8.1S Horizon (370-hp) (Inboard) Specifications

Fuel Type	Gasoline
Horsepower	370-hp
Warranty	3 Years
Displacement (cu/cc)	496.00 cu / 8,127.98 cc
Number of Cylinders	8 Cylinders
Configuration	V8
Fuel Delivery	Fuel Injected
Cooling System	Raw Water
Weight (lbs/kg)	1,130.00 lbs / 512.56 kg
Charging System	65 A
Length/width/height	47 in / 33 in / 24 in
Full Throttle RPM	4600