Wärtsilä 9L25 Ammonia

Wärtsilä 9L25 Ammonia — dual fuel engine. Find specifications, documents and parts support below.

Production StatusIn Production

Maximum Mechanical Power: 2,745 kW
Rated Speed: 1,000 RPM

Estimated electrical output

Engine power × 0.90. These are estimates, not manufacturer generator ratings. Actual output depends on the alternator and operating conditions.

Frequency / duty	Engine	Estimate
Frequency and duty unverified	2,745 kWm	2,470.5 kWe

Datasheet & documents

Match the model number on your engine plate to the document. Check its revision date and the speed and duty listed for each power rating.

Downloads

Document
Wärtsilä 9L25 Ammonia — primary reference

Source notes

Wärtsilä 9L25 Ammonia is identified in the linked primary reference.

Application-specific ratings are not inferred.

Verified rating reference (2026-10-15): Wartsila 25 manufacturer brochure, 2024, explicitly lists 9L25 Ammonia and 305 kW/cylinder at 1000 rpm.

Mechanical reference 2745 kW is the stated per-cylinder output multiplied by 9 explicitly specified cylinders, corroborated by the manufacturer W25 Ammonia genset rated-power table.

The separate 900 rpm setting is 280 kW/cylinder.

No generator efficiency conversion or duty inference.

Source: lloydfedders.com · PDF; page/section 7.

View 9L25 Ammonia spec image

Wärtsilä 9L25 Ammonia dual fuel high-speed industrial engine specifications — Shareable spec cardWärtsilä 9L25 Ammonia summary imageOpen image

Technical specifications

Technical Specifications

Brand	Wärtsilä
Model	9L25 Ammonia
Fuel Type	Dual Fuel

Check your engine model

The Wärtsilä 9L25 Ammonia is a high-speed industrial dual fuel engine rated at 2,745 kW mechanical output at 1,000 RPM. It is used in off-road equipment and can support engineered variable-speed power systems, but its maximum power is not a direct 50/60 Hz alternator rating. Verify the drivetrain, power electronics, cooling, and emissions installation with Volvo Penta before specifying a generator package.

Other ways this model is written

9l25ammoniaWärtsilä 9L25 Ammonia

BrandAll Wärtsilä engines Complete generatorsdiesel generator sets

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Frequently asked questions

What is the maximum power output of the Wärtsilä 9L25 Ammonia?

The Wärtsilä 9L25 Ammonia has a maximum mechanical output of 2,745 kW at 1,000 rpm. This is a variable-speed off-road rating, not a fixed-speed generator-set rating.

What fuel does the Wärtsilä 9L25 Ammonia use?

The Wärtsilä 9L25 Ammonia is a diesel variable-speed industrial engine.

What is the catalog status of the Wärtsilä 9L25 Ammonia?

The Wärtsilä 9L25 Ammonia is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.

Are reference documents available for the 9L25 Ammonia?

This page links reference documents for the Wärtsilä 9L25 Ammonia. Check each document's title, model coverage, revision and rating conditions before using it for selection.