Introducing Water 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


Cool Jugs (US Patent # 6,408,803) is a complete, bolt-on kit that will allow a conventional air cooled O-360 or O-540 parallel valve Lycoming engine to be converted to water cooling. The result is a fully water cooled aircraft piston engine. An engine that operates at a stable 190 degF without any* need for airflow over or through the engine compartment.

The Cool Jugs conversion kit is not certified for use on type certificated aircraft and is for experimental use only.

The water cooling conversion system consists of the following components:

The Cool Jugs water cooled conversion requires absolutely no internal engine modifications! In fact no existing reciprocating/moving components are changed in any manner. The conversion creates only one additional moving part - the coolant pump, which is grear driven via a standard accessory pad.

Why Convert an Existing Air Cooled Engine to Water Cooling?

While air-cooled engines have demonstrated good reliability and are relatively simple in design they also have significant drawbacks:

  • High operating temperatures
  • Relatively short life spans
  • High cooling drag
  • Complex operating procedures
  • Unstable engine temperatures

High operating temperatures and the resulting thermal cycle range of air cooled engines result in significant (and costly) stress to cylinder heads and exhaust valves. Conversion to water cooling allows engines to operate within a much more manageable (and beneficial) temperature range, resulting in:

  • Longer engine life
  • Reduced cooling drag
  • Simplified operation
  • Increased power & performance
  • Stable engine teperatures
  • Elimination of shock cooling

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Proudly MADE in the U.S.A.