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With growing interest in marinizing the popular 6.6 Duramax diesel. Dmaxstore has begun a new project. We will be installing a LMM Duramax diesel into a single prop Mastercraft X-80. This project will help us bring new Duramax marinizing products to market.
Installing a Duramax into a V Drive Mastercraft will require a ton of R&D and will not be completed in a hurry. We would greatly appreciate advise and input from our members with expertise in the boat industry. Thank you in advance to our friends at PPE and Gale Banks as well as anyone with input or assistance during this project.

Boat Details:
Mastercraft X-80 single prop
Current motor GM Indmar 8.1 big block



Just picked up the boat and making sure there are no suprises. She had been in storage for several years. So far everything is looking good, just needing more power and better fuel economy:)


 

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Shes back from Wrap Concept. All hooked up with some fresh Vinyl and ready for summer. Swim deck's been Line-Xed and back on. Now time for Kenneth to hook up the stereo and us to start working on the 6.6 repower.




 

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Wow. This is an incredible project, I've wondered about this for years. Any update on your progress?
 

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Wow. This is an incredible project, I've wondered about this for years. Any update on your progress?
yste


Just cosmetics for now. We have an 09 complete LMM on the stand. Just researching the best route to go? Think we will do a complete closed cooling system.
 

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Cool project. Good luck
 

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A heat exchange doesn't take up that much room. Plus a closed system will allow the engine to warm up faster which of course will be important for a diesel.
 

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Yeah, I guess that makes sense, but then what about airflow over the hx? Fans? Do the big boats that run diesels from the factory have closed cooling systems?
 

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yes, a closed system on a boat consists of coolant in the engine that flows threw a heat exchange and then a raw water system that cools the heat exchanger. So it still uses water to cool, but the raw water never reaches the engine. A water to water heat exchanger is much more efficent than a radiator, so the size is very small and it requires no fans.

An open system is ok in fresh water, but not something you want in salt for sure.
 

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yes, a closed system on a boat consists of coolant in the engine that flows threw a heat exchange and then a raw water system that cools the heat exchanger. So it still uses water to cool, but the raw water never reaches the engine. A water to water heat exchanger is much more efficent than a radiator, so the size is very small and it requires no fans.

An open system is ok in fresh water, but not something you want in salt for sure.

All good points and the reason we are leaning toward the closed system.
 

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yes, a closed system on a boat consists of coolant in the engine that flows threw a heat exchange and then a raw water system that cools the heat exchanger. So it still uses water to cool, but the raw water never reaches the engine. A water to water heat exchanger is much more efficent than a radiator, so the size is very small and it requires no fans.

An open system is ok in fresh water, but not something you want in salt for sure.

X2

A water/water heat exchanger with a closed loop cooling system (using glycol based coolant) is definitely the way to go on a diesel motor for marine use. Water conducts heat 25x better than air (which is why people get hypothermia much easier in water). An air/water exchanger (like a truck radiator) wouldn't work well on a boat and really makes no sense when you have an "endless" source of cooling via the lake/ocean you're driving on. That way also all you need to check for corrosion damage is the heat exchanger rather than worrying about how the components in the Dmax engine will react to the potential corrosion (WP cavitation, HG's, etc). Then you just need to size the water/water heat exchanger properly for the maximum cooling demands of your engine (don't forget to add some margin of saftey in there too).


Great project BTW!
 

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GOOD info, thanks MTL
 

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All supercharged seadoo's have a water to water cooler in them. I never hear of any issues with them and it's strongly preferred over the open cooling systems when used in saltwater
 

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Flat plate heat exchangers have become very efficient with a very small footprint. So it should not take up to much space it's amazing the difference in size compared to the ones used years ago.

Not sure how that would be done on a boat. For the water loop would you use another belt driven pump, or a electric pump, or a emersion type heat exchanger

Sounds awesome. I wanna drive it!!!
 

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Here is the motor (2009 LMM) accessories and wiring harness are off. Injectors have been sent out for inspection and cleaning. Liquid cooled stainless manifolds and up pipes are in production. Valve covers off to powdercoat. 8.1 will be comming out soon.

 

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8.1 gas trucks have the same allison behind them as the duramax do. Assuming the block is the same as the 8.1 found in the trucks then it will bolt up. Sick build look forward to hearing more.
 

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Will there even be a transmission? Or will the motor be married straight to the drive as usual?
 
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