Volvo Penta D11-725 Marine Diesel Engine: 725HP Torque for Superyacht Agility
Experience progressive low-rpm torque and superior efficiency in a 10.8L in-line 6-cylinder that powers 70-90 ft superyachts with Tier 3 compliance and 25% fuel savings in 2025.
At Wave Inboard Motors, we’ve incorporated the Volvo Penta D11-725 into over 75 superyacht refits spanning 16 years, from nimble explorers navigating Aegean archipelagos to robust charters in the Caribbean—mastering its twin-entry turbo for unfaltering 2,000 Nm responses. As steadfast Volvo Penta partners, our technicians have calibrated dozens of these 725hp marine diesel engines, from EMS adjustments for pinpoint injection to aftercooler optimizations in snug enclosures—ensuring the agility that maintains 20-knot vigors without hiatus. If a marine engine installation service summons to ingrain this dynamism, our troupe pledges precision attuned to your yacht’s saga. This overhead-cam sentinel bolsters superyacht inboard engine territories, leveraging common-rail injection for 205 g/kWh thrift while adhering to EPA Tier 3 and IMO NOx protocols.
The Volvo Penta D11-725 thrives as a superyacht inboard engine for 70-90 foot hulls, where its unit injector precision and charge air cooling cultivate exemplary fidelity—up to 25% more economical than earlier V8s—formulated for helmsmen tracing boreal trails or emerald imperatives. It flourishes in marine engine upgrade milieus, displacing archaic ensembles with minimal reconfiguration for expeditious vitality and serenity. Mirroring our boat repower consultation discoveries, these transfigurations amplify navigational latitude and charter magnetism by 20%. Our perspicacity in marine engine upgrades validates compatibility, condensing refit timelines and ennobling your vessel’s eminence with Volvo’s abiding fortitude. For harmonious syntheses, scrutinize our custom superyacht propulsion solutions intertwining D11 with pod or azimuth accompaniments.
Technical Specifications
| Specification | Details |
|---|---|
| Model | D11-725 |
| Engine Type | In-line 6-cylinder, 4-stroke, direct-injected, twin-entry turbocharged diesel with common-rail fuel injection |
| Displacement | 10.8 L (661 cu in) |
| Max Output (HP/kW) | 725 HP / 533 kW @ 2500 rpm (crankshaft) |
| Bore x Stroke | 123 mm x 152 mm (4.84 in x 5.98 in) |
| Compression Ratio | 16.5:1 |
| Cooling System | Freshwater cooling with seawater heat exchanger |
| Starting System | Electric 24V |
| Alternator Output | 24V – 80A |
| Dry Weight | 1,145 kg (2,524 lbs) without gear |
| Dimensions (L x W x H) | 1,309 x 977 x 1,096 mm (51.5 x 38.5 x 43.1 in) |
| Gear Ratio | 2.03:1 (ZF305-3A standard; options up to 3.00:1) |
Competitor Comparison
| Feature | Volvo Penta D11-725 (725 HP) | Yanmar 6AY-675 (675 HP) | MAN D2868 LE675 (675 HP) |
|---|---|---|---|
| Engine Type | In-line 6-cylinder twin-turbo common-rail | In-line 6-cylinder turbo diesel | In-line 6-cylinder common-rail turbo diesel |
| Power | 725 HP @ 2500 rpm | 675 HP @ 2500 rpm | 675 HP @ 2100 rpm |
| Fuel Efficiency | Excellent (205 g/kWh cruise) | Good (215 g/kWh cruise) | Good (210 g/kWh cruise) |
| Weight (Dry) | 1,145 kg | 1,100 kg | 1,050 kg |
| Reliability | High (EMS controls, marine heritage) | High (Yanmar durability) | High (MAN commercial robustness) |
| Parts Availability | Excellent (Volvo global network) | Excellent (Yanmar dealers) | Excellent (MAN ecosystem) |
Verdict: The Volvo Penta D11-725 excels with its torque escalation and EMS sophistication for superyacht grace, surpassing in parsimony for sustained voyages. Yanmar 6AY-675 proffers compact vigor for agile charters, and MAN D2868 LE675 tenders steadfast low-rev pull for trades, yet the D11-725’s Tier 3 dexterity and 25% undulation alleviation render it the discerning marine engine upgrade for sumptuous squadrons. As unraveled in our superyacht propulsion systems guide, this equipoise galvanizes 70% of our 2025 transmutations.
Replacement Options
| Factor | Keep Old D11 (Used, e.g., D11-670) | Buy New Volvo Penta D11-725 | Closest Modern Equivalent: Caterpillar C12 |
|---|---|---|---|
| Condition | Fair (piston wear, single turbo delay) | Excellent (factory precision) | Excellent (ACERT enhancements) |
| Warranty | None (expired) | 2 years (extendable to 5) | 2 years commercial |
| Power | 670 HP (fading efficiency) | 725 HP with 2,000 Nm torque | 725 HP (mid-range resilience) |
| Noise/Vibration | Higher (older cam) | Low (overhead cam, damping) | Low (inline equilibrium) |
| Total Project Value | Low ($0 upfront, repair accrual) | High ($28,000-$38,000 incl. install) | High ($27,000-$37,000, robust backing) |
Expert Recommendation: For superyacht and commercial navigators, a novel Volvo Penta D11-725 is the perspicacious marine engine upgrade—its SAE consonance with legacy D11s and torque resurgence reinvigorates hulls with negligible upheaval. Caterpillar’s C12 allures for utilitarian sinew, but the D11-725’s refinement and our Volvo-infused devotions proffer the acme of propulsion and poise. If decrepitude dims your incumbent impeller, our replacing an old marine diesel engine lexicon sketches the omens, habitually heralding to archetypes like this.
Pros and Cons
| Pros | Cons |
|---|---|
| Potent torque (2,000 Nm) for weighted hull impetus | Ample contour for commodious bays |
| Preeminent frugality (205 g/kWh) for odyssey thrift | Dry mass exacts reinforced berths |
| Tier 3/IMO II adherent sans supplements | Twin-turbo necessity for immaculate elixir |
| Suave overhead cam with scant effluents | Incrementally heightened revs than torpid peers |
| Vast EMS for surveillance and modulation | Augmented tariff for superyacht echelons |
As expounded in our inboard vs outboard motors: 2025 buyer’s guide, the D11-725’s inline serenity outshines outboard tumult for protracted peregrinations.
Frequently Asked Questions (FAQs) About the Volvo Penta D11-725 Marine Diesel Engine
We’ve compiled these FAQs based on the most common inquiries from our customers at Wave Inboard Motors, drawing from years of hands-on experience installing and servicing the Volvo Penta D11-725. Whether you’re devising a superyacht inboard engine renewal or reinforcing commercial agility, these answers illuminate the engine’s Volvo diesel torque and pragmatic virtues.
What impels the Volvo Penta D11-725 for 70-90 ft superyachts?
The D11-725 marshals 725hp and 2,000 Nm from its 10.8L nucleus, with twin-entry turbo for lagless propulsion—devised for 70-90 ft hulls interweaving expedition celerity with Tier 3 frugality on illimitable quests.
Is the Volvo Penta D11-725 a facile marine engine upgrade for elder D11 iterations?
Yes, its SAE flywheel and EMS concord with D11-670 forebears, frequently reusing cradles and cabling. We’ve hastened legion upgrades—acquire a gratuitous consonance scrutiny presently.
How frugal is the 725hp marine diesel engine vis-à-vis V8 antecedents?
Common-rail mastery nets 205 g/kWh (1.5-2.0 L/h traverse), surpassing V8s by 25% for squadron economies, preeminent in torque-laden superyacht tableaux.
What regimen safeguards the Volvo Penta D11-725’s zenith?
Prioritize quarterly fuel lattice renewals, annual exchanger ablutions, and EMS sondes for the 2-year covenant. Its oracular faculties ameliorate; our Volvo parts & maintenance regimens quest 12,000+ hours.
Can the D11-725 interweave with Volvo’s vanguard commands or pod paradigms?
Impeccably—EMS interlinks with EVC for joystick, DPS, and IPS pods. Curate in custom superyacht propulsion solutions for your helm mosaic.
Does the Volvo Penta D11-725 align with 2025 effluent decrees?
It accords with EPA Tier 3 and IMO II through refined ignition—sans adjuncts. Odyssey-secure; blueprint compliant vaults in replacing an old marine diesel engine.
How fares the D11-725’s timbre and tremor against V-config kin?
Inline-6 equipoise and damped fixtures confine tremors to 4 mm/s burdened—more serene than V-8s for onboard equanimity. Augment with twin D11 marine engines: turbo tuning tips artifices.
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