Cummins ISL-G Facts and Specs

Cummins ISL-G Facts and Specifications

History:

The Cummins L series engine is a straight 6 cylinder engine started in 1982 as the L10 engine. It displaced 10.0 liters (610 cu. In.) in a diesel configuration.
In 1992 the L10 was introduced in a CNG (compressed natural gas) configuration and was designated the L10G.
In 2001 the L10G was replaced by Cummins Westport L-Gas Plus which was 8.9 liters (540 cu. In.) CNG engine was a collaboration with Westport Innovations.
In 2007 the L-Gas Plus was replaced by the Cummins Westport ISL-G which was 8.9 liters (540 cu. in.) CNG engine which was also a collaboration with Westport Innovations.
In 2016 Cummins Westport introduces the Cummins ISL-G Near Zero (NZ) engine. It is 8.9 liters (540 cu. in.) CNG engine. It meets and exceeds the EPA and CARB emissions standards.

 


 

Cummins Designators:

ISL-G = Interact System. Interact System meaning that the engine is capable of interacting with the transmission and other electronically controlled devices in the truck or bus.
L = L series engine line. Which includes L10, L-gas Plus and ISL-G.
B = B series engine line. This includes 3.3, 3.9, 4.5, and 5.9 liter engines. These engines are offered in electronic models and fully mechanical models. The 5.9 liter engine is offered in both automotive and industrial versions.
C = C series engine line, which is the 8.3 liter engines. They are available in both fully mechanical and electronic versions with industrial and automotive versions.
E = An older engine designator which meant the engine was electronically controlled.
Q / QS = Quantum System. Signifies that an industrial engine is electronically controlled.
K = K series engine line, which includes 19, 23, 38, 45, 50, and 60 liter engine models.
M = M series engine line which would be the M11 engine. This is an 11 liter engine that came in industrial and automotive versions.
N = N series engine. Which included NTA855 and N14 engine series that came in industrial and automotive versions.
T = T series engines. The T designates the electronic controlled engine. Example QST30. But, in a mechanically controlled engine, the T designates Turbo. Example 6BT
X = Series engine line, which are the 15 liter engines only. Industrial and automotive versions available.

 


 

Engines:
Cummins Westport ISL-G

Cummins Westport ISL-G is a spark ignition stoichiometric engine. It has an exhaust gas recirculation (EGR) for emissions for NOx (nitrogen oxide) reduction. It uses an EGR cooler to lower to lower combustion temperatures and knock tendency.

ISL-G Specs:

⇒8.9 liter (540 cu. in.) inline 6 cylinder
⇒4 stroke cycle, spark-ignited, turbocharged, charge air cooler(CAC)
⇒Bore and Stroke 4.49 in. X 5.69 in.
⇒Firing order 1-5-3-6-2-4
⇒Oil capacity 7.3 U.S gallons / 29.2 Quarts
⇒Dry weight 1,625 lbs. / 737 kg.
⇒Emissions: EGR and Three Way Catalyst (TWC)
⇒Valve lash cold:
Intake – 0.014 in. (0.355 mm)
Exhaust – 0.030 in. (0.762 mm)
⇒Fuel types: CNG, LNG and Bio-methane.
⇒Three Way Catalyst (TWC) after treatment.
(It does not require Diesel Exhaust Fluid (DEF) or what is known as UREA.)

 


 

Ratings:

 Engine  Advertised HP (kW) @ RPM  Peak Torque lb-ft (Nm) @ rpm Governed speed 
 ISL-G 320  320 (239) @2000  320 (239) @2000  2200 rpm
  ISL-G 300  300 (224) @ 2100  860 (1166) @ 1300  2200 rpm
  ISL-G 280  280 (209) @2000  900 (1220) @ 1300  2200 rpm
  ISL-G 260  260 (194) @ 2200  660 (895) @1300  2200 rpm
  ISL-G 250  250 (186) @2200  730 (990) @ 1300  2200 rpm

 

Maintenance:

 Item  Distance  Hours  Months
 Oil & Filter*  7,500 mi (12,000 km)  500  6
 Fuel Filter  15,000 mi (24,000 km)  1,000  12
 Coolant Filter  7,500 mi (12,000 km)  500  6
 Spark Plugs**  22,500 mi (36,000 km)  1,500  18
 Coolant Change  30,000 mi (48,000 km)  2,000  24
 Valve Adjustment***  30,000 mi (48,000 km)  2,000  24
Air Cleaner Follow manufacturers published recommendation

*Use oil approved for CNG engines
** Service intervals vary based on average speed of vehicle, which increase or decrease intervals
***Initial valve adjustment at 1,000 hours.
 


 

Cummins Westport ISL-G Near Zero (NZ)

Cummins Westport ISL-G Near Zero (NZ) was introduced in 2016. This engine was certified by the Environmental Protection Agency (EPA) and Air Resources Board (ARB) of California for meeting the 0.02 g/bhp-hr optional Near Zero NOx (nitrogen oxide) emission standards for medium duty truck, transit bus, school bus and trash truck. The engine is a spark ignition stoichiometric burn. It has an exhaust gas recirculation (EGR) for emissions. It uses an EGR cooler to lower to lower combustion temperatures and knock tendency.

ISL-G Near Zero (NZ) Specs:

⇒8.9 liter (540 cu. in.) inline 6 cylinder
⇒4 stroke cycle, spark-ignited, turbocharged, charge air cooler(CAC)
⇒Bore and Stroke 4.49 in. X 5.69 in.
⇒Firing order 1-5-3-6-2-4
⇒Oil capacity 7.3 U.S gallons / 29.2 Quarts
⇒Dry weight 1,625 lbs. / 737 kg.
⇒Emissions: EGR and Three Way Catalyst (TWC)
⇒Valve lash cold:
Intake – 0.014 in. (0.355 mm)
Exhaust – 0.030 in. (0.762 mm)
⇒Fuel types: CNG, LNG and Bio-methane.
⇒Closed Crankcase Ventilation (CCV) system that prevent crankcase emissions from going to atmosphere.
⇒Three Way Catalyst (TWC) after treatment.
(It does not require Diesel Exhaust Fluid (DEF) or what is known as UREA.)

 


 

Ratings:

 Engine  Advertised HP (kW) @ RPM  Peak Torque lb-ft (Nm) @ rpm Governed speed 
 ISL-G 320  320 (239) @2000  320 (239) @2000  2200 rpm
  ISL-G 300  300 (224) @ 2100  860 (1166) @ 1300  2200 rpm
  ISL-G 280  280 (209) @2000  900 (1220) @ 1300  2200 rpm
  ISL-G 260  260 (194) @ 2200  660 (895) @1300  2200 rpm
  ISL-G 250  250 (186) @2200  730 (990) @ 1300  2200 rpm

 

 

Maintenance:

 Item  Distance  Hours  Months
 Oil & Filter*  7,500 mi (12,000 km)  500  6
 Fuel Filter  15,000 mi (24,000 km)  1,000  12
 Coolant Filter  7,500 mi (12,000 km)  500  6
 Spark Plugs**  22,500 mi (36,000 km)  1,500  18
 Coolant Change  30,000 mi (48,000 km)  2,000  24
 Valve Adjustment***  30,000 mi (48,000 km)  2,000  24
Air Cleaner Follow manufacturers published recommendation

*Use oil approved for CNG engines
** Service intervals vary based on average speed of vehicle, which increase or decrease intervals
***Initial valve adjustment at 1,000 hours.

 

 

 

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