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Listing ID : 1048032

Mercruiser Sterndrive 4.5L MPI 250 HP

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Mercruiser Sterndrive 4.5L MPI 250 HP

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. A new V6 engine that delivers V8 performance in a compact lightweight package.

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

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 with the Bravo® drive.

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

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.

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.

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



Engine 1

Engine Make : Mercruiser
Horse Power : 250
Fuel Type : Petrol
Drive Type : Sterndrive

Boat Specification