Westport GX400
Built: 2012 · Series: Other models
More machines from model year 2012
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Westport – other heavy-duty road engines: the collective page of EPA-certified bi-fuel engines outside the named ranges, GX400 to GX475, 437 to 486 hp, electronic direct injection for CNG/diesel, model years 2012 to 2013
Westport is a Canadian company headquartered in Vancouver that specialises in gas-engine technology for heavy-duty commercial vehicles, in particular HPDI high-pressure direct injection, which combines natural gas and diesel in the same engine. The versions listed here, GX400, GX450 and GX475, carry the approximate power step in horsepower in their model name. This page gathers the models outside the named ranges.
Read on 3 more paragraphs
The register lists here 3 versions with 437 to 486 hp rated output, all at 1,600 rpm, all with electronic direct injection and bi-fuel operation from compressed natural gas and diesel. Maximum torque ranges from 1,450 to 1,750 Nm, all at 1,200 rpm, model years from 2012 to 2013.
The bi-fuel technology allows a diesel engine of comparable efficiency to run predominantly on natural gas, using diesel only as an ignition aid; such engines are fitted in heavy tractor units and long-haul trucks, where they promise lower greenhouse gas emissions than pure diesel engines at similar power and range.
On a used purchase, the tightness of the high-pressure gas system counts, along with the condition of the cryogenic tanks for compressed natural gas, the function of the pilot injection and the service history of the electronic control unit; service for this specialised technology is concentrated among selected workshops in the long-haul network.
Sources: SpecCodex register, model data: Westport (weitere Heavy-Duty-Straßenmotoren), Westport
Technical data
Engine
| Engine code | EDS-10015050correct |
|---|---|
| Engine family | CWFSH0912XAL; DWFSH0912XALcorrect |
| Engine families | CWFSH0912XAL; DWFSH0912XALcorrect |
| Fuel | Bi-fuel 2(CNG/Diesel)correct |
| Rated output | 325.9 kW (= 437 bhp)correct |
| Rated speed | 1,600 rpmcorrect |
| Maximum torque | 1,450 ft·lbfcorrect |
| Speed at max. torque | 1,200 rpmcorrect |
| Operating cycle | dieselcorrect |
| Injection | electronic direct injectioncorrect |
| Aspiration | single-stage turbocorrect |
Origin and approval
| Built from | 2012correct |
|---|---|
| Built to | 2013correct |
| Model year from | 2012correct |
| Model year to | 2013correct |
Other data
| Application | HHDDcorrect |
|---|
Frequently asked questions
How much power does the Westport GX400 have?
The Westport GX400 delivers 326 kW.
When was the Westport GX400 built?
Production years: 2012.
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 19 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
Sources: US EPA — engine certification data (retrieved August 2026) · How we check the data
Diesel engine in 3D section
Turn the model, look inside and click an assembly — each one is explained.
Parts for this engine (21)
Manufacturer part numbers from the official EPA documentation. No prices or availability — those come from the supplier.
| Part number | Description | Manufacturer |
|---|---|---|
| 4921324 | Charge Combo | Westport |
| 4088832 | Comp In Temp | Westport |
| 4954905 | Coolant temperature sensor | Westport |
| 2872467 | DOC In Temp | Westport |
| 2871960 | DPF Dual Pres | Westport |
| 2872468 | DPF Out Temp | Westport |
| 10007499 | Diesel Rail Pressure Sensor | Westport |
| 2888243 | ECM / Motorsteuergerät | Westport |
| 2872210 | EGR Flow Delta Press | Westport |
| 2872140 | EGR Out Temp | Westport |
| 2872081 | Engine NOx | Westport |
| 2872082 | Engine NOx | Westport |
| 4928594 | Exh Mnfld Press | Westport |
| 4921519 | HC Doser Fuel Pres | Westport |
| 10007909 | Inlet Metering Valve Current Sensor | Westport |
| 2872469 | SCR Out Temp | Westport |
| 2871974 | Tailpipe NOx | Westport |
| 2871978 | Tailpipe NOx | Westport |
| 2871979 | Tailpipe NOx | Westport |
| 2872236 | Tailpipe NOx | Westport |
| 4036059 | Turbo Speed | Westport |
Source: 2012 Model Year On-Highway Heavy-Duty Engine Certification Data
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