Marine Engine
Weichai WP12 Marine Diesel Engine (346–543 hp)
Weichai WP12 11.596 L 6-cylinder diesel engine, 346–543 hp (258–405 kW), 10 ratings for marine work. Each unit nameplate-verified.
Specifications
- Engine Model
- WP12
- Displacement
- 11.596 L
- Cylinders & Configuration
- Inline 6, 4-cycle
- Rated Power Range
- 258–405 kW (346–543 hp) @ 1500–2100 rpm
- Aspiration
- Turbocharged Aftercooled
- Applications
- Marine
- Documentation
- Nameplate verification + load-test record per serial number
Overview
The Weichai WP12 is a 11.596 L 6-cylinder Weichai diesel engine supplied in 10 factory ratings from 346 hp (258 kW) to 543 hp (405 kW). Every rating listed on this page is a complete engine for marine duty, not a generator set, and each unit ships with its serial number recorded against the specification sheet that applies to it.
Ratings in this family differ in rated speed, peak torque and emissions tier rather than in displacement or cylinder count, so the choice between them is a duty-matching question. The specifications panel and the per-rating entries on this page are generated from the same source data, so a rating quoted here can be matched directly against a delivery document.
Specifications
The specifications panel lists the family-level values that are common to every WP12 rating, including the 11.596 L displacement and the inline 6-cylinder layout. Ratings that share displacement and cylinder count but differ in output are listed individually in the model selection section.
Model Selection: WP12 Ratings
Each entry in this section is one rating of the Weichai WP12. The rated power is the output at the stated speed; the peak torque figure is the value the rating develops at the lower speed shown, which is what normally decides whether a rating suits a given machine. Each rating carries a stable anchor, so a single rating can be linked or quoted directly.
WP12C350-15
WP12C350-15 — rated 258 kW (346 hp) at 1500 rpm.
WP12C350-15E121
WP12C350-15E121 — rated 258 kW (346 hp) at 1500 rpm.
WP12CD317E200
WP12CD317E200 — rated 288 kW (386 hp) at 1500 rpm.
WP12CD317E201
WP12CD317E201 — rated 288 kW (386 hp) at 1800 rpm.
WP12C400-18
WP12C400-18 — rated 295 kW (396 hp) at 1800 rpm.
WP12C400-18E121
WP12C400-18E121 — rated 295 kW (396 hp) at 1800 rpm.
WP12C450-21
WP12C450-21 — rated 330 kW (443 hp) at 2100 rpm.
WP12C450-21E121
WP12C450-21E121 — rated 330 kW (443 hp) at 2100 rpm.
WP12C500-21E121
WP12C500-21E121 — rated 368 kW (493 hp) at 2100 rpm.
WP12C550-21E121
WP12C550-21E121 — rated 405 kW (543 hp) at 2100 rpm.
Applications
WP12 engines in this family are normally specified for marine work.
Marine: ratings are quoted against the propulsion or auxiliary duty required, with the gearbox ratio and the duty classification taken into account.
Verification, Documentation and Ordering
Each engine is offered with nameplate verification + load-test record per serial number. That means the model and rating printed on the engine nameplate can be checked against the record issued for that serial number before shipment, which is the point most buyers of re-rated or re-exported engines want covered.
To receive a quotation, send the exact rating from the matrix above (for example WP12C550-21E121), the machine or application it will drive, the quantity, and the destination port. If the rating you need is not listed, send the model and the required output and we will confirm whether it belongs to this family or to a neighbouring one.
Buyer tip: Send your WP12 specification, quantity and destination port for a verified quotation and lead time.
Frequently Asked Questions
What is the power range of the WP12?
The 10 ratings listed on this page run from 346 hp (258 kW) to 543 hp (405 kW), at governed speeds between 1500 and 2100 rpm.
What displacement and cylinder count does the WP12 use?
Every rating in this family shares the same 11.596 L displacement and inline 6-cylinder, 4-cycle configuration. Ratings differ in output, rated speed and emissions tier rather than in the base engine.
What is the difference between WP12C500-21E121 and WP12C550-21E121?
WP12C500-21E121 is rated 368 kW (493 hp) at 2100 rpm, while WP12C550-21E121 is rated 405 kW (543 hp) at 2100 rpm. They use the same base engine; the higher rating is the one to specify when the driven load needs the extra torque at the lower speed.
How is a WP12 rating ordered?
Send the exact rating shown in the model selection table, the application it will drive, the quantity and the destination port. The engine is then quoted against that rating and confirmed against its nameplate and load-test record.
