
PRODUCT Detail
Built to serve the fire service, the Cummins X12 provides the highest power-to-weight ratio of any heavy duty engine.
- Up to 500 HP and 1700 lb-ft of torque
- 600 lbs less for flexible cab design
- Special emergency vehicle calibrations
Improvements to the compression braking provides 20% stronger braking for greater vehicle control. With over 100,000 engines in service around the world with over 1 billion miles of real-world experience, you can count on the Cummins X12.
NOTE: For all engines and options available, horsepower may be limited by the truck OEM
REPTO – Available – Torque limit of 466 lb-ft continuous, 516 lb-ft intermittently, gear drive ratio is 1.18:1, rotation is opposite of the crankshaft
FEPTO – Available – Torque limit up to 625 lb-ft
Configuration | Inline 6 | |
Displacement | 720 CU IN | 11.8 L |
Lube Oil Capacity | 42 QT | 39.8 L |
Biodiesel Compatibility | Up to B20 | |
Engine Braking Horsepower | Up to 450 HP @ 2300 RPM | |
Idle Speed | 600-800 RPM | |
Governed Speed | 2000 RPM | |
Engine Weight (Dry) | 2050 LB | 930 KG |
Aftertreatment Weight** | 173-191 LB | 78-87 KG |
**Depending on configuration
Support.
Cummins on Every™ Corner – Over 3,500 authorized locations across North America, to support parts and service needs.
Peace of Mind – Base warranty backed by Cummins for a full 5 years/100,000 miles, whichever comes first. Up to 8 years of optional full engine coverage, including injectors.
Cummins Guidanz™ and INLINE™ Mini – Read real time engine data and email fault information from your smart phone to speed up the repair process.
QuickServe™ Online Mobile – Provides complete parts and service information based on specific ESNs.
Connected Diagnostics™ – Wirelessly connects Cummins-powered emergency vehicles to product experts at Cummins for immediate diagnosis of an engine system fault.
Easier Maintenance – The compact design of the X12, together with easy service points for scheduled maintenance increases uptime.
Get the Latest – Need more information about the Cummins X12 engine or Cummins Onan generators? Visit our Fire and Emergency Engines page. You can also stay up to date with quarterly articles in the First Responder newsletter at firstresponder.cumminsnewsletters.com.

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