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.
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 is the only CARB 4-Star rated engine over 500 HP (& we did it at 607 HP) making it the cleanest high-powered engine in the industry.
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 meet the highest level of emissions standards—meaning they come with CARB’s “Ultra Clean” 5-Star rating and emit the lowest emissions of any engine in the industry which Malibu knew would be critical in the world’s best-selling towboats.
Powered by 
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.
5.3L Direct Injected
MALIBU MONSOON M5Di
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. Learn More
6.2L Direct Injected
MALIBU MONSOON M6Di
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. Learn More
Powered By GM® Marine 6.2L Direct Injected
MALIBU MONSOON LT4™
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. Learn MorePerformance 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.
Lowest Emissions
The M5Di and M6Di both received the highest rating the California Air Resources Board (CARB) offers, “Ultra Clean” 5-Star rating, which exceeds the EPA standard.
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.
MALIBU MONSOON M5Di AND M6Di ENGINE FEATURES:
- CARB 5 Star Ultra Clean
- 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
MALIBU MONSOON LT4 ENGINE FEATURES:
- CARB 4 Star Super Ultra Low Certified
- 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
behind-the-scenes look at our engine process
Watch our lead Drive Train Engineer explain how Malibu brought unmatched reliability to the all-new M5Di and M6Di.
Watch