Cummins 4BT4.5 Engine

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Cummins 4BT4.5 Engine

Cummins 4BT4.5 engine shares the same bore diameter as the 4BT (3.9L) and 6BT/ISB 5.9L. However, the 4BT4.5 engine features a much longer 5.39″ stroke, versus the 5.9L/3.9L’s 4.72″ stroke. The engine was designed for industrial applications, though it has attracted some attention for engine swaps. In terms of its likelihood for a conversion, the greatest downfalls are the electronic controls and relatively low availability.

Cummins 4BT4.5 engine is originally designed and produced by Cummins Inc. in Cummins Brazil Plant.


Configuration: Inline 4 cylinder, B series engine family
Displacement: 275 cubic inches, 4.5 liters
Bore x Stroke: 4.02 inches x 5.39 inches
Injection: Mechanical
Aspiration: Holset Turbocharger, intercooled.
Weight: 745 lbs
Horsepower: 110 – 173 hp @ 2,200 – 2,500 rpm
Torque: 305 lb-ft @ 1,500 rpm
Engine Dimensions: Length Width Height
32.2″ 28.1″ 34.5″

CO-MACH provide different solutions for your 4B4.5 engines which were originally built with VP30 fuel pump 3965404 , Dephi DP210 fuel pump 3957698 , Bosch VE fuel pump 3979020, we supply the long blocks / short blocks instead of overhauling the internal parts. Well you can choose a QSB3.9 8valves engines replace your 4B4.5, 4BTA4.5, 4BTAA4.5 engines.

CO-MACH Power is dedicating in remanufacture / rebuild / recondition and supply following products:
    • Cummins engine assy, Long / Short Block:
      • Mechanical engine / long block: 4B3.9, 4BTA3.9, 4BTAA3.9, 4B4.5, 4BT4.5, 6B5.9, 6BTA5.9, 6BTAA5.9, 6C8.3, 6CTA8.3, 6CTAA8.3, 6LTA8.9, 6LTAA8.9, 6LTAA9.3, 6LTAA9.5, 6ZTAA13, NT855, KTA19, KTTA19, KTA38, KTTA38,  KTA50, KTTA50
      • Electronical ISB3.9 8valves, ISB3.9 16valves, ISB4.5/ISDe4.5, ISBe5.9 12valves, ISBe5.9 24valves, ISBe6.7 /ISDe6.7, ISC8.3, ISLe8.9, ISL9.5, ISZ13, ISM11, QSB3.9 8valves, QSB3.9 16valves, QSB4.5, QSB5.9 12valves, QSB5.9 24valves, QSB6.7, QSB7, QSC8.3, QSL8.9/QSL9, QSL9.3, QSL9.5, QSZ13, QSM11
    • Komatsu engine assy, Long / Short Block:
      • 4D102 Series (S4D102, SA4D102, SAA4D102),
      • 6D102 Series (S6D102, SA6D102, SAA6D102),
      • 4D107 Series (SAA4D107),
      • 6D107 Series (SAA6D107),
      • 6D114 Series (S6D114, SA6D114, SAA6D114)
    • Fuel System parts, Turbos …
      • Fuel Injector, Fuel Pump,
      • Turbochargers
There are serval options for you to decide the engine condition that you need:
    • Original new engine from Cummins China,
    • New Built engine which is built with 90% OEM or OEM Equivalent parts
    • Recon(reconditioning) / Reman(remanufacturing) / Rebuilt(rebuilding) engine


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