I was being silly at first, but how about just one cylinder from a turbo cummins diesel? 1000 cc, 100 ft pounds torque, 50 horsepower, 4" exhaust pipe, and a jake brake, 350,000 miles, give or take, between rebuilds. I could live with that. Maybe we could get Kenworth to build it. Been on the interstates lately? If ya can't beat em, join em. If we was willing to sacrifice a bit of engine longevity to get more horsies, maybe a one lung cummins could put out 100 ponies in exchange for say, 175,000 miles between rebuilds., I could live with that too.