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  • Warlock Duramax Diesel Speedboat - Diesel Power Boat

Warlock Duramax Diesel Speedboat - Diesel Power Boat

1,300 Lb-Ft Of Torque

Jason Sands
Oct 24, 2007
Photographers: Jason Sands
We were recently at Pacific Performance Engineering (PPE) and noticed something interesting sitting in the shop. A 21-foot Warlock speedboat drew our attention, and as we walked over, we noticed that it was-you guessed it-diesel-powered.
Photo 2/2   |   warlock Duramax Diesel Speedboat engine
Its '05 LLY Duramax makes approximately 650 hp and 1,300 lb-ft of torque at about 3,400 rpm and has a redline of 3,600 rpm. This gives the boat a top speed of more than 80 mph, and acceleration feels comparable to a 1,000hp gas engine due to the immense torque of the diesel. Fuel economy is roughly two and a half times better than a similar gasoline engine.
The engine employs a four-stage cooling system to keep everything happy. First, water enters the air-to-water intercooler placed on top of the engine to cool the intake charge. Next, it is routed through an oil cooler to keep the engine from frying itself under constant load. In the third step, the water enters the engine and water-cooled turbocharger. Lastly, water is sprayed into the exhaust to keep the outside pipe temperature cool enough so it won't melt the side of the boat.
Exhaust gas temperatures are a major factor in a boat because they're always under full load. (Think towing up a hill that never ends, and you get the idea.) To keep things in check, a GT4094R turbocharger is used along with a single CP3 pump. Any more fuel, and the EGT would get higher than the 1,200 to 1,300 degrees F that are necessary for constant full-throttle use. The pump that supplies the air-to-water intercooler with fresh water is located down at the bottom of the engine and flows a healthy 32 gallons of water per minute.
Diesel torque is a force to be reckoned with, and most drive systems aren't made to handle 1,300 lb-ft of torque, so a $20,000 Mercury Bravo 1 XR outboard drive system had to be used to keep parts from snapping like twigs under the strain. The drive has the most aggressive prop that can be bought-and could still use more.
The air-to-water intercooler is extremely efficient and is used to decrease the inlet temperatures from more than 400 degrees.
To keep people from burning themselves while reaching into the engine bay, this Inconel and silicone insulation is placed over the exhaust and is the same stuff the U.S. Coast Guard uses in its boats.
One reason the LLY version of this Duramax won't be used in crate marine engines is that it has an extra injector-driver computer that adds complexity to the swap's electronics. Later models had this extra computer integrated into the main ECM.
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