
PRODUCT Detail
The ISL G Near Zero (NZ) NOx natural gas engine was the first MidRange engine in North America to receive emission certifications from both the U.S. Environmental Protection Agency (EPA) and Air Resources Board (ARB) in California for meeting the 0.02 g/bhp-hr optional Near Zero NOx Emissions standards for medium-duty truck, urban bus, school bus, and refuse applications.
The Cummins Westport ISL G NZ exhaust emissions are 90% lower than the current EPA NOx limit of 0.2 g/bhp-hr. Like the industry leading ISL G engine, the ISL G Near Zero operates on 100% natural gas which can be carried on the vehicle in either compressed (CNG) or liquefied (LNG) form. The ISL G NZ can also run on renewable natural gas (RNG).
The ISL G Near Zero is no longer available. It has been replaced by the L9N near-zero emissions engine. Learn more at cumminswestport.com.
Advertised Horsepower | 320 hp | 239 kW |
Peak Torque | 1,000 lb-ft | 1,356 N•m |
Governed Speed | 2,200 rpm | |
Clutch Engagement Torque | 550 lb-ft | 746 N•m |
Type | 4-cycle, spark-ignited, inline 6-cylinder, turbocharged, CAC | |
Displacement | 540 cu. in. | 8.9 L |
Bore and Stroke | 4.49 in x 5.69 in | 114 mm x 145 mm |
Operating Cycles | 4 | |
Oil System Capacity | 7.3 U.S. gal | 27.6 L |
Coolant Capacity | 13.1 U.S. qts | 12.4 L |
System Voltage | 12 V | |
Net Weight w/ Std. Accessories, Dry | 1,625 lbs | 737 kg |
Aftertreatment | Three-Way Catalyst (TWC) | |
Fuel Types | CNG / LNG / Biomethane Methane number 75 or greater | |
Availability | Click here for OEM availability |
Cummins Westport engines can accept a wide range of natural gas fuel compositions.
Use our Fuel Performance Specification Calculator to ensure compatibility.
Factory-Built, Dedicated Natural Gas Engine – Manufactured on the same assembly line as Cummins diesels, the ISL G Near Zero, like the ISL G, shares many components and parts with Cummins L Series diesels.
- Electronic Control Module: Provides full monitoring and control of engine sensors, fuel system and ignition system, with full interface capability to Cummins INSITE and diagnostic service tools.
- Three-Way Catalyst: Simple passive device, highly effective hydrocarbon, CO and NOx control with no maintenance costs. No Diesel Particulate Filter (DPF) or Selective Catalytic Reduction (SCR) systems are required. The ISL G Near Zero catalyst includes a mid-catalyst temperature sensor connected to the ECM.
- Closed Crankcase Ventilation (CCV): The ISL G Near Zero features a chassis mounted CCV system that prevents crankcase emissions that are generated by the engine during normal operation from escaping into the atmosphere. This reduces engine related Methane emissions by 70%, by capturing crankcase emissions and redirecting them through the CCV filter where any oil is removed before sending crankcase gases back to the intake manifold to be reintroduced to the combustion chamber.
- Low installed weight: Highest power:weight ratio in its class.
- High-Energy Ignition System – Improved Ignition Control Module (ICM) provides better performance and improved spark plug and coil durability, plus self-diagnostics.
- Fuel Capability – Natural gas can be stored on the vehicle in either compressed (CNG) or liquefied (LNG) form. The ISL G can also operate on renewable natural gas or biomethane that meets fuel-quality specifications.

ดาวน์โหลดโบร์ชัวร์สินค้า
ลงทะเบียนเครื่องยนต์และเครื่องกำเนิดไฟฟ้าของคุณวันนี้ เพื่อรับข้อมูลล่าสุดเกี่ยวกับสินค้า
ข้อมูลทางเทคนิค การซ่อมบำรุง และการขอคำแนะนำสำหรับคุณ
similar products
COMMERCIALQD 11HDKBN-6000C
Power
Torque
Certification

X15N (2024)
Power
400 - 500 hp
Torque
1450 - 1850 lb-ft
Certification

Remanufactured Cummins Turbo Diesel
Power
325 - 385 hp
Torque
610 - 930 lb-ft
Certification

B6.7 Structural Engine
Power
155 - 326 hp
Torque
650 - 1014 lb-ft
Certification
EU Stage V, EPA Tier 4F

6.7L Cummins Turbo Diesel (2018) for Chassis Cab
Power
320 - 325 hp
Torque
650 - 750 lb-ft
Certification
EPA 2018

6.7L Cummins Turbo Diesel (2019) for Chassis Cab
Power
360 - hp
Torque
800 - lb-ft
Certification
EPA 2018

F4.5 Structural Engine
Power
130 - 160 hp
Torque
476 - 476 lb-ft
Certification
EU Stage V, EPA Tier 4F

X15 Performance Series (2017)
Power
485 - 565 hp
Torque
1650 - 2050 lb-ft
Certification
EPA 2017

X15 Performance Series for Heavy-Duty Truck (2017)
Power
485 - 565 hp
Torque
1650 - 2050 lb-ft
Certification
EPA 2017

X15 Performance Series for Fire & Emergency (2017)
Power
505 - 565 hp
Torque
1850 - 1850 lb-ft
Certification
EPA 2017

X15 Performance Series for TEMs & Body Builders
Power
485 - 565 hp
Torque
1650 - 2050 lb-ft
Certification
EPA 2017

L9 for Shuttle Bus (2017)
Power
260 - 380 hp
Torque
720 - 1250 lb-ft
Certification
EPA 2017

X15 For Motorhomes (2017)
Power
565 - 605 hp
Torque
1850 - 1950 lb-ft
Certification
EPA 2017

X15 (Stage V)
Power
450 - 675 hp
Torque
1600 - 2050 lb-ft
Certification
EU Stage V
