Why Boats Run SIX Engines — and Why Seven Doesn't Exist

Six engines. Three thousand horsepower. About $460,000 hanging off one transom — before you even buy the boat. Everyone assumes it's about speed. It isn't. The most powerful outboard engine you can buy stops at 600 horsepower — and that ceiling is a business decision, not physics. Once you see why, you can read any transom in the marina. We also went looking for the seven-engine boat everyone swears exists. What we found says more about this industry than the boats do. CHAPTERS 0:00 Six engines, one boat 0:46 The 600 hp wall 1:36 The record that got killed (Seven Marine 627) 2:46 Why not just build bigger? 3:36 Two engines 4:24 Three engines 5:08 Four engines 5:59 Five engines 6:45 Six — the record, and the mistake everyone makes 7:49 The real reason — and who's forcing it (nobody) 8:48 The twist: fewer, bigger wins 9:49 Why six still exists 10:27 Seven? 11:23 What the wall actually costs 11:56 Verdict Sources include Mercury Marine's published comparison testing, Volvo Penta's Seven Marine acquisition announcements, and manufacturer specifications. Spotted an error? Corrections welcome — I read every comment.