With the shorter MDT size cabs about the largest engine you can get is the 300 hp 860 lb size like CAT has had for a few years. Freightliner might have a Mercedes with a little more power but not much more.
From what I understand the problem is that the more powerful engines need more room for greater cooling capacity. So if you need or want a more powerful engine you have to go from the 8 1/2 foot BBC sized cabs into the 10 foot BBC sized trucks.
Using Freightliner as an example that would be going up from a M2 106 to a Freightliner Columbia. There is a M2 111 but I think that in in the 10 range again.
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