Cummins ISB

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The Cummins ISB is an inline 4- or 6-cylinder diesel engine used in commercial passenger vehicles. The 4-cylinder engine has a displacement of 4.5 litres, and the 6-cylinder engine has a displacement of 6.7 litres. Prior to the update to meet the EPA 2007 and Euro 4 standards, the engine was available in displacements of 3.9 or 5.9 litres.

The Cummins B Series engine was updated in 1998 with four valves per cylinder, Bosch VP44 injection pumps, and new electronics under Cummins' Interact System. The engine was renamed the ISB (for Interact System). For the 2003 model year, the ISB was introduced with Bosch high pressure common rail fuel injection and increased power output. The EPA 2007 ISB introduced a variable geometry turbocharger and active particulate filter as standard. To further reduce nitrogen oxide (NOx) levels to EPA 2010 and Euro 4 standards, Cummins employed selective catalytic reduction (SCR). The EPA 2010 ISB, known as the ISB6.7, is only available as a 6-cylinder engine. It received EPA 2010 certification on January 8, 2010. The EPA 2013 and Euro 6 have On-Board Diagnostics to monitor emissions-related engine systems.

Models

The following models are used in buses.

Model Max. Power Max. revs Max. Torque Emmissions Certifications
ISB 185 185 hp 2600 rpm 420 lb-ft @ 1600 rpm EPA 2004
ISB 200 200 hp 2600 rpm 465 lb-ft @ 1600 rpm EPA 2004
ISB 200 200 hp 2500 rpm 520 lb-ft @ 1600 rpm EPA 2004
ISB 200 200 hp 2600 rpm 520 lb-ft @ 1600 rpm EPA 2007, EPA 2010
ISB 215 215 hp 2500 rpm 520 lb-ft @ 1600 rpm EPA 2004
ISB 220 220 hp 2600 rpm 520 lb-ft @ 1600 rpm EPA 2007, EPA 2010
ISB 230 230 hp 2500 rpm 520 lb-ft @ 1600 rpm EPA 2004
ISB 240 240 hp 2600 rpm 550 lb-ft @ 1600 rpm EPA 2007, EPA 2010
ISB 240 240 hp 2600 rpm 560 lb-ft @ 1600 rpm EPA 2007, EPA 2010
ISB 245 245 hp 2500 rpm 660 lb-ft @ 1600 rpm EPA 2004
ISB 250 250 hp 2600 rpm 660 lb-ft @ 1600 rpm EPA 2010
ISB 260 260 hp 2600 rpm 550 lb-ft @ 1600 rpm EPA 2004
ISB 260 (HEV) 260 hp 2500 rpm 660 lb-ft @ 1600 rpm EPA 2004
ISB 260 260 hp 2600 rpm 620 lb-ft @ 1600 rpm EPA 2007
ISB 260 H 260 hp 2600 rpm 620 lb-ft @ 1900 rpm EPA 2007, EPA 2010
ISB 260 260 hp 2600 rpm 660 lb-ft @ 1600 rpm EPA 2010
ISB 275 275 hp 2600 rpm 660 lb-ft @ 1600 rpm EPA 2004
ISB 280 280 hp 2600 rpm 660 lb-ft @ 1600 rpm EPA 2007, EPA 2010
ISBe 135-185 hp 2500 rpm 650 Nm Euro 3
ISBe 140-207 hp 2500 rpm 800 Nm Euro 4
ISBe 140-207 hp 2500 rpm 800 Nm Euro 5
ISBe 250-300 hp 2500 rpm 1100 Nm Euro 2
ISBe 285-275 hp 2500 rpm 950 Nm Euro 3
ISBe 205-300 hp 2500 rpm 1100 Nm Euro 4
ISBe 205-300 hp 2500 rpm 1100 Nm Euro 5

References

v·d·e
Cummins logo.png
Current products
Diesel B4.5 / B6.7 - L9 - X12 / X15
CNG ISB6.7 G - ISL G - ISX12 G - L9N
Former products
Diesel ISB6.7 - ISL9 - ISX12 / ISX15 B5.9 - C8.3 - ISC - ISM - L10 - M11 - NH Series - VTB-903
CNG B5.9G - B Gas Plus - C8.3G - L10G - C Gas Plus - L Gas Plus
Propane B LPG Plus