Why Is the 4BT Cummins So Popular for Engine Swaps?
Posted by DPS on Jun 19, 2025
Why Is the 4BT Cummins So Popular for Engine Swaps?
If you’re considering a diesel engine swap, chances are you’ve come across the legendary Cummins 4BT. Known for its durability, simplicity, and surprising performance, this 3.9L inline-four diesel engine has become one of the most popular engines to repower everything from off-road rigs to delivery vans—and even marine vessels.
Compact but Capable
Measuring just over 30 inches long and weighing 750–800 lbs, the 4BT is c
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Upgrading Your ISX Cummins Turbo: The Power Advantage
Posted by Will on May 23, 2025
Upgrading Your ISX Cummins Turbo: The Power Advantage in an ISX S400 Conversion KitThe Stock Turbo ProblemFor diesel enthusiasts familiar with the ISX Cummins engine, one critical limitation stands out above all others: the severely undersized stock turbocharger. With a tiny 2.6-inch intake wheel diameter, the factory turbo is woefully inadequate for a massive 15-liter power plant. To put this in perspective, this turbo is comparable to what you'd find on a 6.7L Ram pickup truck - already consid
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Fummins Compound Turbo Kits: The Ultimate Ford Cummins Conversion Upgrade
Posted by DB on May 20, 2025
Fummins Compound Turbo Kits: The Best Twin Turbo Upgrade for Your Ford Cummins Swap
Looking to turn your Ford into a diesel powerhouse? At Diesel Power Source, we offer engineered solutions for Ford Cummins swaps—known as Fummins conversions. Our industry-leading S480/S300 compound turbo kits are designed for high performance, low EGTs, and an OEM-like fit for Ford trucks from 1970 to 1998.
What Is a Fummins Conversion?
A “Fummins” is a Ford truck powered by a Cummins engine. E
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