What could someone possibly need with an engine like this? Bigger than what any one man might need, this metal brick house was built by Rotary Power International, a company no longer in operation, for something needing high amounts of torque but not many RPMs. It is said to be a great deal lighter than any other engine of the same degree. Its called the 350-2 NG.

While intended for boats, the 350-2 NG takes diesel for its fuel and even is turbocharged. With a configuration of up to 6 rotors, this block is capable of reaching a horsepower of up to 3000.

The problem here is, when Rotary Power International was laid to rest, so was the 350-2 NG project. Now if you want to get your hands on this beefy rotary engine, be expected to shell out at least $168,000 USD, just for the 1000 HP version.
 

"..take a basic two-rotor, 1,000hp, 1700-lb. 580 Series (it has 5.8 liters displacement per rotor) rotary diesel, add 800lb, for a reduction gear and accessories and voila: you have a reliable diesel engine weighing in at only 2.5 lb./hp. By comparison, a high-tech, modern reciprocating diesel in this power class typically weighs in 4 or more lb./hp and is some 2' longer than the rotary. This rotary engine is due to be introduced early next year when RPI and ARP plan to install three 1,000-hp engines in a fast ferry to be built on the West Coast"

press release by RPI

Here are the specs for the 350-2 NG with a 2 rotor configuration:
  • Engine Size/cc: 11600 (11.6 L)
  • Size Cubic Inch: 700
  • Max HP: 750
  • Max HP Turbo: 1500
  • Max RPM 3600: 3600
  • Est. Weight Lbs: 1895
  • Engine Cooling: Liquid