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Thread: Cummins NHC 250 vs Mack ENDT 673

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    4 Star General sandcobra164's Avatar
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    Default Cummins NHC 250 vs Mack ENDT 673

    I have a quick question. Are these two engines anywhere near the same ballpark in regards to horsepower and torque output? I know what is in the manuals but can they be tweaked reliably to perform basically the same?
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    4 Star General fuzzytoaster's Avatar
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    The 250 is going to be cheaper to acquire and more practical to find parts for. I can't speak on a side by side comparison but the 250 would be a more logical choice.
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    4 Star General Scar59's Avatar
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    Stick with the Nifty 250; easier to maintain all around, parts avalability, cost, etc.
    I'm not saying let's eliminate all the stupid people. I'm just saying let's remove all the warning labels and let the problem work itself out.



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    Colonel av8or's Avatar
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    Everyone is correct so far, but the ? Is how is the Mack for power? Mack has a good rep.

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    General Fredo Corleone's Avatar
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    Endt 673 237hp? could be between 200 to 250 smaller displacement than the cummins harder to find parts.
    Last edited by Fredo Corleone; 07-16-2016 at 10:00.
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    Joe you have driven Proud American many times. She has the Mack ENDT and I'm sure you will agree she is powered right. I also have/had several 250's and I believe the Mack is a much stronger engine.
    Ignorance can be educated and crazy can be medicated but there is no cure for stupid.

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    There are three military versions of the Mack ENDT-673 engine each one progressively better in performance. The last version was usually coupled with the Spicer 5-speed overdrive transmission for best performance. The parts are not difficult to locate except for the unique water pump used by the military and those can still be found at reasonable prices. The Mack comes with a turbo.

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    4 Star General juanprado's Avatar
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    Someone posted the Aussie GL equivalent link in another thread. One of the neat things they have is all the tm's posted for download.

    I am not Mack knowledgeable but looks like the Australians used them a lot. Not sure if it the same engine.

    Thought some of you might enjoy the links to their Mack tm's
    http://afmsafety.com.au/safety/mack-truck/
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    3 Star General fasttruck's Avatar
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    Mack ENDTt 673 weighs less than a NH250 and are easier to start in cold weather. You didn't say what chassis you have but my experience in the service was that a M52A1 with an overdrive transmission would run faster than a M818 with a NH250 and out pull a M52A2 with a Continental.

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    4 Star General sandcobra164's Avatar
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    I am simply contemplating. I use my trucks for work and play and have a line on a M54A1 with the ENDT 673. It is a very stout truck but I want to gauge whether it can handle the same tasks as an M923A0 with the old nifty 250 in it. It would be classified as an M923A1 due to the addition of 14R20 singles currently. Heaviest I have pulled crossed the line at around 24,000 pounds and I rolled around 65 mph for most of that trip. No discussion of manual vs. auto, I have no trouble shifting gears. When I need a truck to do a job, I need the best tool for the job but I do love the sound of a Mack! I am not very concerned about top speed but I want confirmation that a Mack ENDT 673 can be turned up to act in place of a Cummins. 11 liters turbocharged should do the work on 14 liters breathing without forced air.
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