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Mercury® MerCruiser®
4.5L

The Next Generation

Featuring a host of engineering innovations, the 4.5L series establishes new standards for power-to-weight ratio, driver experience, acceleration, durability, and ease of maintenance.

See All Models and Specs

Built for Marine

Built for Marine

Designing a V-6 block solely for marine use allows Mercury to build the 4.5L with the ultimate protection system, using cast-iron componentry where the engine intersects with seawater, and using corrosion-resistant aluminum and composites everywhere else.

Corrosion Protection.

Corrosion Protection.

The MercFusion Paint System creates an outer seal against the elements, while MerCathode® provides automatic protection against galvanic corrosion. For maximum defense against saltwater effects, the SeaCore® industrial hardcoat anodizing system and closed-cooling circuit is available.

Smooth & Quiet.

Smooth & Quiet.

The 4.5L’s newly designed rear-facing throttle body, anti-whistle throttle plate, engine cover and mounts, lightweight flywheel, fuel-supply module, and structural oil pan all work together to deliver a superior idle, smoothness and low vibration. Resulting in an exceptional driving experience.

Sporty Handling.

Sporty Handling.

The 4.5L comes standard with Adaptive Speed Control, which automatically maintains engine rpm regardless of load or water conditions. The result is increased throttle response and a sporty feel.

Powerful Performer.

Powerful Performer.

Thanks to its new, long-runner scroll intake manifold which draws in more air and converts it into additional torque, the 4.5L delivers a ground-breaking power-to-weight ratio and gives you V-8 power in a V-6 package.

Specifications

Mercury® MerCruiser®: 4.5L

  • HP / kW
    • 250 / 186
    Maximum RPM (WOT)
    • 4800-5200
    Engine type
    • V6, 2-valve/cylinder pushrod
    Displacement (L)
    • 4.5
    Bore and stroke
    • 4.0 x 3.6" / 102 x 92 mm
    Fuel requirement
    • 90 RON 10% Ethanol Maximum
    • Unleaded Regular 87 Octane Minimum (R+M/2)
    Fuel delivery system
    • Computer controlled Multi-Port Electronic Fuel Injection (MPI)
    Air induction
    • Performance-Tuned Scroll Intake Manifold
    Ignition
    • SmartCraft PCM 112 Digital Inductive
    Alternator amp / Watt
    • 70 amp / 882 watt (Belt-Driven)
    Water drain system
    • Air Actuated "Season Extender" (Bravo)
    • Easy Drain "Season Extender" (Alpha)
    Exhaust system
    • Through prop
    Cooling system
    • Water cooled with thermostat; FWC available as factory option (Alpha) and packaged with SeaCore Drive (Bravo)
    Lubrication system
    • Integrated wet sump
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Dimensions (L x W x H)
    • 28 x 30 x 22" / 696 x 740 x 559 mm
    Weight (engine only)
    • 756 lbs / 343 kg
    Compatible drives
    • Alpha
    • Bravo One
    • Bravo Three
    • Bravo Two
    Print Compare With Other Products Request a Quote
  • HP / kW
    • 200 / 149
    Maximum RPM (WOT)
    • 4400 - 4800
    Engine type
    • V6, 2-valve/cylinder pushrod
    Displacement (L)
    • 4.5
    Bore and stroke
    • 4.0 x 3.6" / 102 x 92 mm
    Fuel requirement
    • Unleaded 91 RON Minimum
    Fuel delivery system
    • Computer controlled Multi-Port Electronic Fuel Injection (MPI)
    Air induction
    • Performance-Tuned Scroll Intake Manifold
    Ignition
    • SmartCraft PCM 112 Digital Inductive
    Alternator amp / Watt
    • 70 amp / 882 watt (Belt-Driven)
    Water drain system
    • Easy Drain "Season Extender"
    Exhaust system
    • Through prop
    Cooling system
    • Water cooled with thermostat; FWC available as factory option
    Lubrication system
    • Integrated wet sump
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Dimensions (L x W x H)
    • 28 x 30 x 22" / 696 x 740 x 559 mm
    Weight (engine only)
    • 756 lbs / 343 kg
    Compatible drives
    • Alpha
    Print Compare With Other Products Request a Quote
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