Draft:Fummins

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Fummins is an informal term used to describe a type of engine swap in which a Ford Super Duty truck is fitted with a Cummins diesel engine, typically the 5.9 L or 6.7 L inline-six engines originally used in Ram pickup trucks.^[1] The term is a portmanteau of “Ford” and “Cummins”.

Such conversions are primarily performed within the diesel enthusiast community in North America and are intended to combine the chassis and body design of Ford trucks with the characteristics of Cummins diesel engines.^[2]

Engine swaps involving Cummins diesel engines into Ford trucks began appearing in enthusiast communities in the early 2000s. Interest in these conversions increased during the production period of Ford’s 6.0 L and 6.4 L Power Stroke diesel engines, which were the subject of reliability discussions in automotive media and enthusiast communities.^[2]

By the 2010s, Cummins-powered Ford builds were regularly featured in automotive publications and online media, contributing to wider recognition of the conversion type.^[3]

A Fummins conversion involves replacing the original Ford powertrain with a Cummins inline-six diesel engine. These projects require integration of mechanical, electrical, and electronic systems.

• Cummins diesel engine (commonly 5.9 L or 6.7 L)
• Transmission (manual or adapted automatic)
• Engine mounts and crossmembers
• Adapter plates for drivetrain compatibility

• Electronic control module (ECM) integration
• Wiring harness adaptation
• Communication with factory instrument clusters
• Transmission control compatibility
• Emissions system integration, depending on jurisdiction

Due to the complexity of integrating systems from different manufacturers, many conversions involve custom fabrication and specialized calibration.^[2]

As interest in Cummins-powered Ford conversions increased, a range of aftermarket components and services emerged to support these builds. These include engine mounting systems, drivetrain adapters, and wiring solutions designed to facilitate integration between platforms.^[2]

Specialized tuning and calibration services have also been developed to address compatibility between engine control systems and vehicle electronics.

Fummins conversions are typically performed on heavy-duty pickup trucks used for towing, off-road driving, and performance-oriented applications.^[3]

Builders often pursue these conversions to combine specific chassis characteristics with diesel engine performance and serviceability.

The term “Fummins” is used within diesel enthusiast communities to describe Ford–Cummins hybrid builds. Such vehicles are frequently featured in automotive media, online forums, and enthusiast publications.^[1]

• Engine swap
• Ford Super Duty
• Cummins
• Ram pickup

• (Add relevant third-party links here if appropriate)

• "Cummins-Swapped Ford F-350 Custom Pickup". MotorTrend.
• "A Do-Anything Cummins-Swapped Ford F-250". DrivingLine.
• "Shop Tour: Destroked – Cummins Conversions". Diesel World.
• "12-Valve Fummins Build Feature". Engine Builder Magazine.