Torque Monsters, Given Their SizeĬhronologically, the 4BT hit the streets before the 6BT and was originally released in July of 1983. Adding to the engine’s reliability is the fact that everything is gear-driven (the camshaft, injection pump, accessory drive system etc.) so there is no timing chain or belt interval to worry about. The 4BT shares the same bore, stroke, forged-steel connecting rods, pistons, injectors and valvetrain parts with the 6BT, and all of these items can be interchanged. Natural, turbocharged and turbocharged and aftercooled (depending on application)ġ05 hp at 2,300 rpm (most common early power rating)Ģ65 lb-ft at 1,600 rpm (most common early torque rating)Įssentially a 6BT Cummins with two cylinders chopped off, much of the love shown toward the 4BT engine is based on the 6BT’s ability to handle as much as 1,500 hp on factory-based components or its capacity to remain in operation for a million miles. Single cam, overhead valves w/2 valves per cylinderĬhain-driven SOHC w/4 valves per cylinderĭirect injection, Bosch mechanical injection (rotary pump and then plunger pump)ĭirect injection, Bosch high-pressure common-rail injection From oil pan to turbocharger, we’ll lay out the facts-the final verdict is up to you. Taking all of the above into account, it’s time to pit these two engines against each other for the ultimate mini-Cummins face-off. the 12-valve 5.9L Cummins)? Or maybe it’s due to the relatively low cost of a used 4BT or its widespread availability? After all, the 4BT was introduced in 1983, so there is no shortage of usable core blocks, heads and various other parts laying around in junkyards or still bolted to abandoned bread vans, gen-sets and skid-steers. But why? Is it due to the 4BT’s direct ties to the legendary 6BT (i.e. Still, while Cummins’ R2.8 engine represents the most comprehensive diesel crate engine package ever offered, it has had little impact on the 4BT swap craze. It’s electronically fueled and controlled, but Cummins removes the wiring headache from the equation by furnishing the R2.8 complete with an ECM and engine wiring harness-along with everything else you need to complete the install. However, for the last two-and-a-half years it’s had some competition: the Cummins R2.8 crate engine-an even more packageable inline four cylinder that meets modern day emission standards and weighs nearly 300 pounds less. Its million-mile durability, mechanical simplicity and exceptional fuel efficiency make it a natural choice for anyone looking to build a fuel-sipping vehicle that will last forever. For nearly 20 years, the Cummins 4BT has been the compact diesel of choice in countless engine swaps, classic repowers and off-road projects.
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