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Malibu Monsoon Engines

Award-Winning Performance, Unmatched Reliability

The new Malibu Monsoon line of engines, the M5Di, M6Di, and the LT4, were developed by Malibu to offer unmatched performance, fuel economy, reliability and sound reduction.

Malibu was able to accomplish this feat by bringing engine production in-house. The engine experts at Malibu worked with industry leaders like GM® Marine, Roush®, Davinci®, and McLaren Engineering® to design and perform the research and development necessary to introduce a line of in-board engines to the towboat industry like no other.

The new M5Di, M6Di, and LT4 direct injection engines are only available in a Malibu. Contact your local dealer to experience the next generation of power today.

Malibu Monsoon LT4

Big. Bold. Malibu.

Only Malibu

The Malibu Monsoon LT4 was specifically designed to give you an engine that is easier to maintain, service and operate. Give your boat the power it deserves.
Malibu Monsoon LT4 Engine built by Malibu Boats

Unmatched Reliability

With over 4,000 hours of durability testing in multiple water conditions and extreme altitudes, we are proud to provide you with proven reliability.

Clean Machine

The Malibu Monsoon LT4 has Ultra Low Emissions and is the cleanest high-powered engine in the industry.

Powered by Official World Games Towboat

Our close partnership with GM Marine and adherence to the strictest industry standards, the Malibu Monsoon engines are produced in Malibu’s new state-of-the-art engine facility where every boat and engine are water tested.


More power, more fun. With 607 HP, let your engine do the hard work so you can sit back and enjoy the action behind the boat.
Malibu Monsoon LT4 Engine built by Malibu Boats, Video
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Maximizing Power and Efficiency

M5Di // M6Di

Next Generation Engines

Simply Innovative

The Malibu Monsoon engines were uniquely designed with essential engine components moved toward the front to make maintenance more accessible, offer a quieter ride, and improve durability.

Direct Injection

Technology is the key behind our new ultra-clean engines. It all starts with direct injection, which bypasses the air intake manifold and injects fuel directly into the combustion chamber, making for a cleaner, more controlled and complete burn resulting in improved fuel economy.

Going Green

The M5Di and M6Di engines have Ultra Low emissions which Malibu knew would be critical in the world’s best-selling towboats.

Powered by Official World Games Towboat

Thanks to a close partnership with GM Marine and following the strictest industry standards, the Malibu Monsoon engines are produced in Malibu’s new state-of-the-art engine facility located adjacent to the boat production facility in Tennessee where every boat and engine are water tested.

Why FeAD®

The custom cast, patent-pending front-end accessory drive (FeAD) features a fully integrated cooling system where engine oil and transmission fluid temperatures are controlled in a single integrated system that uses an environmentally friendly coolant instead of raw water.
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Engines Built with Unrivaled Quality

Malibu Boat Monsoon M5Di Engine
5.3L Direct Injected


TORQUE - 400 FT-LBS @ 3800 rpm

POWER - 360 HP @ 5600 rpm

Whether you’re going for another buoy or generating surf swells, Malibu’s new M5Di has the power to get you there with more efficiency than ever before.

Malibu Boat Monsoon M6Di Engine
6.2L Direct Injected


TORQUE - 460 FT-LBS @ 3800 rpm

POWER - 430 HP @ 5600 rpm

Designed to be the standard engine in some of largest Malibu boats and the first step up in the powertrain options, the M6Di still has the lowest sound level at various RPMs and fuel economy levels comparable to smaller engines.

Powered By GM® Marine 6.2L Direct Injected


TORQUE - 606 FT-LBS @ 3800 rpm

POWER - 607 HP @ 5600 rpm

Designed to deliver torque at low RPMS, the Malibu Monsoon LT4™ brings you all the power you need for a full day on the water you can rely on.

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Performance at its Core

Award-Winning Design

Malibu engineers and partners spent thousands of hours designing, 3D-printing and testing over 200 custom parts to make what will set the new standard for inboard engines. The engines themselves along with key components like the custom manifolds, have already been lauded with awards.
Award-Winning Design

Exceptional Quality

Backed by the World’s largest towboat manufacturer, the Malibu Monsoon engines quality began during the marinization process and continued through the manufacturing process. Utilizing the state-of-the-art methods like smart tools, these engines are tested not only on dynos, but have benefitted from thousands of hours of in-boat testing.
Exceptional Quality

Powerful & Efficient

The Malibu Monsoon line of engines were designed to deliver peak torque earlier for water sports, around 3,000 RPMs, for optimal performance & fuel economy. Longevity is also ensured from this powerband since the engine doesn’t have to run at higher RPMs.
Powerful & Efficient


  • Ultra Low Emissions
  • Cast Aluminum Block and Cylinder Heads
  • Cast Aluminum Marine Oil Pan
  • Dual Equal Cam Phasing – 2V
  • Glycol Cooled Oil/Transmission Heat Exchangers
  • Mess Free Oil Changes with Cartridge Style Oil Filter
  • Reversed Fresh Air Induction
  • Reversed Composite Intake Manifold
  • 11:1 Compression
  • Closed Cooled ½ System
  • Custom Hydrophobic Flame Arrestor


  • Ultra Low Emissions
  • Built by Malibu, Powered by GM Marine
  • Unique 3-Way Catalyzed System
  • Direct-Inject Technology
  • Innovative Air Coolers
  • Integrated Oil Cooler/Filter
  • Stainless Steel Water Jacketed Tuned Headers
  • Custom Designed to Increase Reliability




Watch and see why Malibu Monsoon Engines were designed to make sure engine issues never cut into your time on the water.

Direct Injection = Quiet Engines

Direct Injection = Quiet Engines

Watch and see why Malibu Monsoon Engines designed a quieter engine allowing you to have full conversations while running on the water.

Engines Built for Power

Engines Built for Power

Watch and see why Malibu Monsoon Engines were designed to deliver peak performance every single time.

behind-the-scenes look at our engine process
How we brought unmatched reliability to the M5Di & M6Di

Behind-The-Scenes Look At Our Engine Process

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