Meets U.S.A. EPA and CARB 2010 emissions standards today.
 The ISL G natural gas engine not
only meets 2010 EPA and CARB emissions levels today, it also sets a new benchmark for lower alternative fuel vehicle life cycle
costs. In high fuel use applications, the lower alternative fuel costs, improved fuel economy and lower incremental maintenance
costs of the ISL G make it possible to save valuable fleet dollars.
For more information on how using natural gas can improve your bottom line, contact your regional
Cummins Westport sales representative. For information on tax incentives like the Highway and Energy Bill, please visit
our Incentives page.
Note: The ISL G engine replaces the L Gas Plus and C Gas Plus engines in North American markets.
Features
- Stoichiometric Cooled Exhaust Gas Recirculation (EGR)—Uses high EGR rates in combustion process in place of
excess air (Lean Burn) that improves fuel efficiency and creates an oxygen free exhaust allowing for the use of a
Three-Way Catalyst
- Cummins Cooled EGR—lowers in cylinder temperature and reduces oxygen concentration
- New Electronic Control Module—provides full monitoring and control of engine sensors, fuel system and ignition
system
- Three-Way Catalyst—simple passive device, highly effective hydrocarbon, CO, and NOx control with no exhaust
system related maintenance costs
- Low installed weight—highest power to weight ratio in its class
- Improved clutch engagement torque
- LNG, CNG, or Biomethane capable
- Meets EPA and CARB 2010 emissions standards
- Meets EEV
Specifications
| Advertised Horsepower |
250–320 hp |
186–239 kW |
| Peak Torque |
660–1,000 lb-ft |
895–1,356 N•m |
| Governed Speed |
2,100–2,200 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 |
| Oil System Capacity |
7.3 U.S. gal |
27.6 L |
| Coolant Capacity |
13.1 U.S. qts |
12.4 L |
| Net Weight w/ Std. Accessories, Dry |
1,500 lbs |
680 kg |
| NOx Emissions |
0.2 gm/bhp-hr |
| PM Emissions |
0.01 gm/bhp-hr |
| Fuel Types |
CNG /
LNG /
Biomethane
Methane number 75 or greater
|
Cummins Westport engines can accept a wide range of natural gas fuel compositions.
Use our Fuel Performance Specification Calculator to ensure compatibility.
Ratings
| Model |
Advertised Horsepower
|
Peak Torque @ 1,300 rpm |
| ISL G 320 |
320 hp (239 kW) @ 2,000 rpm |
1,000 lb-ft (1,356 N•m) |
| ISL G 300 |
300 hp (224 kW) @ 2,100 rpm |
860 lb-ft (1,166 N•m) |
| ISL G 280 |
280 hp (209 kW) @ 2,000 rpm |
900 lb-ft (1,220 N•m) |
| ISL G 260 |
260 hp (194 kW) @ 2,200 rpm |
660 lb-ft (895 N•m) |
| ISL G 250 |
250 hp (186 kW) @ 2,200 rpm |
730 lb-ft (990 N•m) |
Maintenance Replacement Intervals
| |
Hours |
Distance |
Months |
| Oil and Filter |
500 |
15,000 mi (24,000 km) |
6 |
| Coolant Filter |
None |
None |
None |
| Spin-on Fuel Filter |
1,000 |
15,000 mi (24,000 km) |
12 |
| Spark Plugs |
1,500 |
22,500 mi (36,000 km) |
18 |
| Standard Coolant |
2,000 |
30,000 mi (48,000 km) |
24 |
| Overhead Adjustment |
2,000 |
30,000 mi (48,000 km) |
24 |
| Air Cleaner / Element |
Follow vehicle manufacturers published recommendations |
Notes: Based on Normal duty truck application. Intervals will reduce or increase based on average speeds/duty cycles. Default interval is the hours stated.
Interval is whichever comes first—hours, distance or months. Refer to Owners Manual for complete details on Maintenance Intervals.
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