Cummins QSL9 Commercial Lobster Boat Marine Diesel Engine

Description

Need high sprint speed to reach outer lobster grounds before competitors drop traps? The Cummins QSL9 Commercial Lobster Boat Engine produces 405 BHP continuous and 550 BHP intermittent sprint power at 2,100 RPM. This 6-Cylinder 8.9L engine launches downeast hulls onto plane, though skippers must inspect secondary 2-micron fuel filters to protect common rail injectors from contaminated harbor diesel.

Foundry specialists pour this cylinder block from high-tensile gray iron and install replaceable wet sleeve liners that resist bore distortion during full-boost runs. A single-piece 24-Valve cast iron head maximizes airflow across all 6 cylinders. The electrical system provides 12V isolated ground architecture with a 3.0 kW starter and 160A Delco Remy alternator. Dry engine mass registers at 2,000 lbs within an installation envelope of 58.6in length, 38.9in width, and 41.3in height, with a 7.0 US gal oil sump.

Key Features of Cummins QSL9 Commercial Lobster

Commercial trap fishermen buy Cummins QSL9 Commercial Lobster boat engines to power heavy downeast hulls. This engine cuts transit time to offshore ledges while maintaining efficiency during trap hauling.

• Intermittent rating generates 550 BHP at 2,100 RPM for fast offshore transit speed.
• Continuous P1 rating supplies 405 BHP at 2,100 RPM for heavy hauling loads.
• Bosch high-pressure common rail injection operates at 1,600 bar to eliminate stern soot.
• High-capacity tubular heat exchanger with raw water pump keeps coolant temperatures stable.
• Replaceable wet sleeve cylinder liners enable in-hull overhauls without removing the block.
• SAE 1 flywheel housing mates to Twin Disc MG-5075A and ZF 325A transmissions.
• Deep aluminum marine sump holds 7.0 US gal to prevent starvation at planing angles.
• High-output 12V 160A Delco alternator energizes trap haulers and bridge electronics.

Lobster Boat Dynamometer Load Benchmarks

Dynamometer tests verify 550 BHP intermittent output at 2,100 RPM alongside 1,375 ft-lbs peak shaft torque. Turbocharger boost pressure reaches 2.5 bar during full acceleration while common rail rail pressure sustains 1,600 bar. The heavy tubular heat exchanger holds jacket coolant at 185°F under continuous sprint cycles. Exhaust gas pyrometer readings level off at 980°F ahead of the water mixer. Lube oil pressure tracks at 48 PSI at idle and reaches 68 PSI under sustained load with journal runout below 0.0005in TIR.

Downeast Hull Repower Installation Guidelines

Electronic controls pair with wheelhouse stations while mechanical override levers require 7 lbs of linear action. Do not install this 550 BHP lobster boat diesel engine repower package into continuous-duty river pushboats or slow displacement barges that require 100% full-throttle load factors for 24-Hour continuous rotations.

• Drain engine oil and install fresh lube filters every 250 operating hours.
• Replace primary and secondary 2-micron fuel filter elements every 500 operating hours.
• Inspect heat exchanger raw water zinc anodes every 60 days to prevent electrolytic corrosion.

Factory Crate Inclusions Warranty Scope

Cummins covers this commercial lobster boat package with a 2-Year or 2,000-Hour limited commercial warranty. Each wooden shipping crate contains the complete bobtail engine, 12V 3.0 kW starter motor, 160A Delco alternator, vibration isolation mounts, digital display wiring harness, oil pan drain valve, and official factory technical manuals.