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Weichai WP12 Series Marine Diesel Engine

    Weichai WP12C series — 11.6L inline 6-cylinder delivering 350–550 HP across P1/P2/P3 duty ratings, meeting IMO Tier II with CCS & EIAPP certification.

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    350–550 HP Output Three duty ratings: P1 continuous, P2 intermittent, P3 high-performance — 1500–2100 rpm range.
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    11.6L Heavy-Duty Build 126×155 mm bore/stroke, forged crankshaft, split-cap forged rods, aluminum alloy pistons.
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    Dual Fuel System Option P-type mechanical pump or common-rail — dual-skinned fuel pipes with alarm and water separator.
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    IMO Tier II Certified T/TA aspiration meets international marine emission standards for commercial vessels.
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    Dual Cooling System Fresh/raw water heat exchanger, centrifugal fresh water pump, self-priming raw water pump.
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    CCS & EIAPP Approved SAE1 flywheel housing, 24V voyage safeguard monitor, optional remote harness & classification trial.
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Product Description

The Weichai WP12 Series marine diesel engine delivers 350-550HP (258-405kW) for medium-to-large vessels, covering P1 (unrestricted continuous) to P3 (high-performance intermittent) duties. Featuring a 126x155mm bore, 11.6L inline 6-cylinder design with mechanical/common-rail fuel systems and turbocharged intercooling, it ensures efficient combustion and low emissions. Key components include a forged crankshaft, dry liners, oil-cooled aluminum pistons, and duplex oil filters for heavy-duty reliability. With 24V electric starting, intelligent monitoring, and CCS/EIAPP certification, it supports optional remote monitoring and PTO, ideal for cargo ships, fishing boats, and workboats.

Technical Specifications

Item WP12C Series WP13C Series
Model WP12C400-18 WP13C450-18 WP13C500-18
Type In-line,water-cooled,four-stroke
Number of cylinders -bore ×stroke(mm) 4-126×155 6-127×165
Displacement (L) 11.596 12.54
Induction system Turbocharged & intercooled
Rated power/speed (kW(Ps)/r/min) 295(400)/1800 330(450)/1800 368(500)/1800
Min.specific fuel consumption of external
characteristics(g/kW ·h)		 ≤191
Oil consumption rate(g/kW ·h) ≤0.5
Idle speed 650±50 r/min
Governor Mechanical
Flywheel housing SAE NO.1#14
Certificates ZC、CCS、EIAPP、China lI
Diemension (L×W×H) (mm) 1695×858×1385
Dry weight (kg) 1200
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