Cummins QSM11 High-Output Inboard Marine Diesel Engine

Description

Need massive hole-shot acceleration to push a heavy convertible sportfisher onto plane? The Cummins QSM11 High-Output Inboard Diesel Engine supplies 450 BHP continuous and 715 BHP sprint power at 2,500 RPM. Replaceable wet sleeve liners resist high combustion pressures, though sport yacht captains must maintain primary 2-micron fuel water separators to protect high-dollar Celect electronic unit injectors.

Engineers cast the block from high-tensile gray iron and install replaceable wet sleeve liners that withstand severe thermal stress during high-RPM runs. A single-piece 24-Valve cast iron head maximizes charge air delivery across all 6 cylinders. The 12V isolated ground electrical system features a 3.0 kW starter and 160A alternator for heavy marine navigation packages. Dry weight measures 2,620 lbs inside a chassis envelope of 52.3in length, 42.5in width, and 39.8in height, with a 10.0 US gal oil pan.

Key Features of Cummins QSM11 High-Output

Custom yacht builders buy Cummins QSM11 High-Output engines to power fast express sportfishers and luxury motor yachts. This sprint-rated platform combines rapid vessel acceleration with clean low-speed trolling manners.

• Intermittent sprint rating generates 715 BHP at 2,500 RPM for fast tournament canyon runs.
• Continuous commercial P1 rating maintains 450 BHP at 2,100 RPM for long-distance cruising.
• Cummins Celect electronic unit injection meters fuel at high injection pressure for soot-free transoms.
• High-capacity marine heat exchanger regulates thermal balance under extended high-speed runs.
• Replaceable wet sleeve cast iron cylinder liners protect the block from internal bore wear.
• SAE 1 flywheel housing mates to ZF 325A and Twin Disc MG-5114A transmissions.
• Cast aluminum marine oil sump carries 10.0 US gal to prevent starvation at steep planing angles.
• EPA Marine Tier 3 compliance fulfills coastal emissions standards without liquid exhaust additives.

High Output Dynamometer Boost Thermal Limits

Dynamometer testing confirms 715 BHP intermittent output at 2,500 RPM with 1,720 ft-lbs peak shaft torque. Turbocharger boost pressure climbs to 2.85 bar during full throttle acceleration while Celect unit injectors maintain balanced fuel distribution. The high-capacity seawater heat exchanger stabilizes engine jacket coolant at 186°F during prolonged high-speed sprint runs. Exhaust gas pyrometer readings level off at 1,030°F at the turbo outlet pipe. Main oil gallery pressure reads 46 PSI at idle and reaches 70 PSI at 2,500 RPM with journal runout below 0.0005in TIR.

Sport Yacht Hull Installation Limits

Digital CAN bus helm controls wire into multi-station vessel networks while mechanical emergency override levers require 7 lbs of push-pull force. Do not drop this high-rating commercial workboat diesel engine repower package into continuous-duty river pushboats or heavy cargo barges that require 100% load factors for 24-Hour continuous rotations.

• Drain engine oil and install fresh spin-on lube filters every 250 operating hours.
• Replace primary 2-micron fuel water separator filter cartridges every 500 operating hours.
• Inspect heat exchanger seawater tube zinc anodes every 60 days for electrolytic wear.

Factory Shipping Manifest Warranty Scope

Cummins covers this high-output inboard diesel with a 2-Year or 2,000-Hour limited marine warranty. Uncrating reveals the fully assembled bobtail engine, 12V 3.0 kW starter motor, 160A alternator, vibration isolation mounts, digital display wiring harness, oil pan drain hose, and official factory technical manuals.