Pronunciation: eye‑ess‑ell nine
A Sexy and Robust 8.9-liter inline-six diesel engine made by Cummins, known for being tough, dependable, and built to haul serious weight. Found in everything from motorhomes to fire trucks, the ISL9 is basically the workhorse of the medium- and heavy-duty world. Outputs range from 260 to 450 horsepower with up to 1,250 lb-ft of torque, making it a favorite for anyone who refuses to break down on the job.
Key Features:
8.9L inline-six
260–450 hp, up to 1,250 lb-ft torque
XPI fuel system + VGT turbocharger
Perfect for motorhomes, buses, fire trucks, and medium-duty trucks
Known for durability, efficiency, and extreme-condition reliability
A Sexy and Robust 8.9-liter inline-six diesel engine made by Cummins, known for being tough, dependable, and built to haul serious weight. Found in everything from motorhomes to fire trucks, the ISL9 is basically the workhorse of the medium- and heavy-duty world. Outputs range from 260 to 450 horsepower with up to 1,250 lb-ft of torque, making it a favorite for anyone who refuses to break down on the job.
Key Features:
8.9L inline-six
260–450 hp, up to 1,250 lb-ft torque
XPI fuel system + VGT turbocharger
Perfect for motorhomes, buses, fire trucks, and medium-duty trucks
Known for durability, efficiency, and extreme-condition reliability
"My RV runs on an ISL9—this thing can go coast to coast without breaking a sweat."
"Fire trucks love the ISL9; when lives are on the line, there’s no room for weak engines."
“This 2011 New Flyer XD60 powered by this Godly Cummins ISL-9 Sounds so amazing that it makes my Girl’s Tits hard”
"Fire trucks love the ISL9; when lives are on the line, there’s no room for weak engines."
“This 2011 New Flyer XD60 powered by this Godly Cummins ISL-9 Sounds so amazing that it makes my Girl’s Tits hard”
by EMD F59PHI October 24, 2025
Get the Cummins ISL-9mug.