|Quoting Speedracer1407 (Reply 49):|
Witness, for example, that when faced with the challenge of busting through the 400HP mark for the latest M3 to stay on par with their competition, BMW went to a 4 liter V8 and ended up with an engine that's actually lighter and more compact than the less powerful 3.2L I6 of the previous M3.
Exactly my point. The fact that most of the heavy truck engines are inline sixes to me speaks of inertia, not merit. Caterpillar, Cummins, and others have been building inline sixes for so long that it's habit (although Caterpillar builds smaller V-8's). Detroit Diesel was the only one who went seriously for V engines; their engines were considerably lighter for the output than any others, but being 2 cycle they had other problems. The -92 series initially had serious quality problems, which hurt them immensely, ultimately leading to GM selling them to Penske, who designed the -60 series. Why he stuck with inline instead of V I have no idea. I would have gone with V. By the way, a V-6 can be made just as smooth as an inline; it is trickier, though, as it requires a much more elaborate crank (unless you can make it 120 degrees, which is usually too bulky.)