on discovery channel,Jessy James of CA. chopper fame,used 855(14 liter) 350 hp. Cummins diesel from Peterbuilt and built a trike with it. MUST be biggest trike on road. showed drag race with a truck tractor on streets in CA. intrest to me,notice my kickname. used Cummins,Mack,Detroit, Cat and Perkins as instructional aides in lab for many years.