It's my guess that inline engines are cheaper to produce than v type and probably easier to fit into most heavy equipment,but there are still many v engines used in indutrial applications,lots of large tugs and ships use v12 and v16 cat or gm deisels,mack truck just discontinued making its big v8 deisel about 4 years ago,v8 jimmy's were all the rage in trucks years ago,the 892 silver series jimmy was a two stroke v8 deisel with two turbochargers feeding into a supercharger producing over 550 horse power,this was back in the early 70's.todays large truck engines are pretty much all inline six's,cat,cummins.gm,volvo,mercedes all produce inlines,some putting out 700 horsepower and up to 2400 foot lbs of torque and still getting around 8 miles to the gallon pulling huge loads on the highway,so they are vey cost efficient to produce and run as well as easier to maintain and rebuild.....jimm
