Trucks / Pierce

Pierce PACCAR MX-13

Big-block PACCAR power for Pierce custom chassis with published torque, warranty, and chassis fit details.

Program Overview

The PACCAR MX-13 gives Pierce customers a 12.9-liter big-block engine choice aimed at departments that want high torque, quieter operation, and a long-haul service profile on custom chassis apparatus. Pierce positions it as an exclusive North American offering on Enforcer and Velocity chassis, with Saber availability handled through the Build My Pierce program.

What You'll Learn From This Page

Published PACCAR engine specs from the 2025 sell sheet
Chassis availability across Enforcer, Velocity, and qualifying Saber builds
Key operating and maintenance highlights called out by Pierce

Configuration Matrix

Quick sizing and chassis guidance across the current Pierce lineup.

Specification	Published Value
Configuration	Inline 6-cylinder
Horsepower	510 hp
Torque	1,850 lb-ft at 1,000 RPM
Displacement	12.9 liters
Dry Weight	2,600 lbs
Bore x Stroke	130 mm x 162 mm
Oil Capacity	42 qt
Rear Engine PTO	Available
Warranty	5-yr / 100,000 miles
Chassis Availability	Enforcer, Velocity and Saber through Build My Pierce

PACCAR MX-13 Highlights

Big-Block Output for Custom Chassis

Pierce markets the MX-13 around strong torque delivery and clean off-the-line response for heavy apparatus builds.

510 hp published rating
1,850 lb-ft torque peak at 1,000 RPM
12.9-liter displacement

Service and Packaging Advantages

The sell sheet frames the engine around lower maintenance demand, fuel efficiency, and protected electrical packaging suited for emergency-service duty.

Outstanding fuel economy claim in overview
Weatherproofed and encapsulated wiring called out
Rear engine PTO availability noted

Published Chassis Fit

Pierce lists the PACCAR MX-13 on Enforcer and Velocity custom chassis, with Saber availability limited to the Build My Pierce pathway.

Exclusive on Pierce custom chassis in North America
Manufactured in Columbus, Mississippi
5-year / 100,000-mile warranty in overview

Engine Design Notes

Pierce calls out quiet operation, high-pressure common rail injection, and compacted graphite iron castings as the core technical differentiators.

Quiet and smooth operation
High-pressure common rail fuel injection
Lightweight and durable CGI casting design

Pierce Chassis Links

The PACCAR MX-13 is presented by Pierce as a custom-chassis engine option, so these chassis pages are the main fit references to review alongside the overview.