Introducing Liquid Cooled Conversions for O-360 and O-540 Lycoming® Engines

Frequently Asked Questions
Technical Specs
Pricing & Warranty


Coolant jacket Cylinder head
Cylinder liner
Thermostat housing
Coolant Pump
Coolant Distribution Manifold
Cooling System Analyzer

How much?

The question that ultimately everyone wants to know. Before scrolling down consider what we are offering. Our Cool Jugs conversion gives you a bona-fide, genuine water cooled aircraft engine not some automotive conversion. Our conversion not only extends the life of the engine and eliminates all of the thermally related problems of an air-cooled engine but also offers:

  • More Power!
  • Improved Fuel Efficiency
  • Reduced cooling drag
  • Safer cabin heat
  • Higher reliability

These are just a few of the major benefits of a water cooled aircraft engine. You simply can't compare the cost of our water cooled conversion to that of a new set of air-cooled cylinders for which you get none of the above and all of the same old air-cooled related problems.

Compared to What?

Of course you can't compare our conversion to any other aircraft engine well - because there aren't any. Wait - I almost forgot, there is the water cooled Continental TSIOL-550 which you can have for the cool sum of about $96,000! Of course you will also have to consider what it would cost to re-engine your aircraft.

You also can't compare what we are offering with any automotive engine conversion. Do you really believe that an automotive conversion will be as reliable and light weight as a purpose designed aircraft engine? No way! Even if you were able to build such an engine the cost would be more than triple, yes triple the cost of our Cool Jugs conversion with a significant weight penalty. Factor in the costs of re-engining your airframe and the actual installed and flying cost just went well over $80,000 if not more.

Proudly made in the USA

Consider as well that we have invested some 12 years of development and lots and lots of $$$$ in developing a truly airworthy water cooled aircraft engine solution. We must also produce our parts to the strictest of all quality assurance methods in small quantities for a very limited market. Unlike virtually all other engine parts manufacturers we didn't run to Taiwan or other offshore production facilities - we prefer to use American production companies here at home because we can control the quality of our parts much more carefully.

Finally, the Cool Jugs conversion is more than just a set of bolt on parts. It is an entire system, designed to work with the existing base engine in order to obtain the best performance and reliability that is possible.

Each Liquid-Cooled Conversion Kit Includes:

Liquid-cooled cylinder assemblies that are ready to use, complete with new:

  • Intake & Exhaust valves
  • Valve seats
  • Valve springs
  • Rocker Arm bushings
  • Top-end gasket set
  • Rocker box covers
  • High Performance coolant pump
  • Thermostat Housing
  • Coolant manifold
  • Hoses (excluding engine to radiator hoses)
  • Coolant system analyzer
    • Coolant temperature
    • Coolant pump output pressure
    • Low Coolant warning


We offer a 15 year/3000 hour pro-rata, limited warranty on the major components of the conversion which include the water cooled cylinders, valve train (limited to intake/exhaust valves, valve seats & springs) and coolant pump.

4 Cylinder, 0-360 Lycoming® Conversion:

Estimated price


6 Cylinder, 0-540 Lycoming® Conversion:

Estimated price

Prices subject to change without notice.

Liquid Cooled Air Power © 2001 Liquid Cooled Air Power. All Rights Reserved.
1413 Prospect Ave., Hermosa Beach, CA 90254
Proudly MADE in the U.S.A.
Proudly MADE in the U.S.A.