Is the Cummins ISL a good motor?
Victoria Simmons
Published Feb 08, 2026
Is the Cummins ISL a good motor?
Cummins ISL is a highly flexible power choice with a low weight, compact size and fuel efficient 8.9 litre configuration. With a lighter weight than competitive engines, operators benefit from high performance, strong acceleration and lower operating costs, all with the reliability and durability expected from Cummins.
What displacement is a Cummins ISL engine?
8.9 Litres
Features
| Cummins ISL Euro 5 Specifications | |
|---|---|
| Type | 4-cycle, in-line, 6 cylinder, Turbocharged/charge air cooled |
| Bore & Stroke | 114 x 145 mm (4.49 x 5.69 in) |
| Displacement | 8.9 Litres (541 cu in) |
| Compression Ratio | 16.6:1 |
How big is a Cummins 8.9 litre engine?
Region Change your Region and Language here. Cummins ISL is a highly flexible power choice with a low weight, compact size and fuel efficient 8.9 litre configuration.
How big is a Reman ISL Cummins Engine?
Reman ISL Long Block Parts List: Cummins ISL Spec Engine Data Engine Type Four Stroke, In-Line, Six Cylinder, Displacement 8.9 L (541 ci) Bore 4.49 in (114 mm) Stroke 5.69 in (145 mm)
When to use a Cummins ISL long block?
A remanufactured Cummins ISL long block is a great replacement for someone who has experienced catastrophic internal engine failure but still has good reusable external components that can be saved from their old motor. Long blocks are also a good alternative when trying to reduce costs in the hunt for a new engine.
What’s the temp on a Cummins ISL 8.9?
With ambient temps in the mid to high 80s it runs around 210 degrees on level ground at 65 mph. On a two mile, 2% grade (a tiny hill) it went to 216. Slow down to 40 mph or coast downhill and the temp will drop to 180.
Are there any issues with the Cummins ISL 9L?
The CUMMINS isl is a very good engine, at our shop we have had very little major engine issues before the 400,000 mile range. When you get to 400,000-500,000 it will definitely need an over haul. But to more answer your question the issues before that mileage has been water pumps, air compressors, and on a rare occasion an injector or 2.
Region Change your Region and Language here. Cummins ISL is a highly flexible power choice with a low weight, compact size and fuel efficient 8.9 litre configuration.
What is the coolant temp on a Cummins ISL 8.9?
When driving on relatively flat roads, when the outside air temp is 60 to 80 degrees, our engine coolant temp runs about 198 – 204 degrees, depending on the steepness of any small hills we may be climbing or descending. Even when driving across the Arizona desert, when it was 115 degress, our coolant temp ran a pretty consistent 202 – 206 degrees.
