Friend of mine put a 12.7 outta a fire truck in his W900. I don’t remember the particulars but it wasn’t easy, fun or cheap by time he got it together. I do know the W9 had a 12.7 in it when he began the project. Sounded like a simple deal but wasn’t
Detroit 60 Series 12.7 Fire truck engine
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Peterbiltt, Mar 7, 2025.
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Don’t see anything ending in 45. Should end in 60. @benjamin260_6 is an expert on Detroits. Maybe he’ll chime in. Full serial # might help get build date. M code usually means no cooling nozzles. Easy upgrade. PK (1998) has 15:1 pistons. BK (1999) has 16.5:1 pistons, and usually 7650 injectors. They’re 9 hole instead of 6 hole. Finer spray for better atomization. Along with pistons, fixed the white smoke on start up problems that the older ones had after an OH, and the required lonox programming.
Last edited: Mar 27, 2025
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I may be mistaken but some fire trucks ran a higher horsepower but lower torque tune requiring you to drive it at a higher rpm . At least this was the case with a c12 cat I had . It pulled great at 15 to 1700 rpm and kept up easily with our 475 cats BUT it was easy to snuff out on a big grade with a 50,000 lb load.
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