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The CCI Engine


MkII Section

Clarke-Brayton Engine

The Clarke-Brayton Engine is a dual compression, dual expansion engine that uses an alternative architecture, high compression ratio and more efficient thermodynamic cycle in order to acheive the following characteristics:

Brake thermal efficiency of 52%

1/4 the size of a conventional enigne of the same power

Lower noise levels

Less vibration

Compression ignition of natural gas, diesel, biofuels, jet-A and JP-8

The reasons that the Clarke-Brayton Engine has such tremendous performance are many. Splitting the cycle into three optimized cylinders gives it the ability to have over a 56:1 compression ratio and a large intake bore to stroke ratio without the combustion shape and friction problems of a conventional engine. Additionally the constant pressure combustion and expansion to atmospheric pressure of the Brayton cycle bolster efficiency.

Engine Animation

Animation of the CCI Engine

Sources of Efficiency

CCI Cycle

Thermodynamic Cycle: Unlike conventional piston engines which use the Otto Cycle or Diesel Cycle, the Clarke-Brayton Engine uses a modified Brayton Cycle - the same cycle used by gas turbine engines. At equal pressure ratios, the Brayton Cycle is inherently more efficient, but even more so at the extremely high 56:1 or greater compression ratio of the CCI engine. The Brayton Cycle advantage comes from expansion to ambient pressure and constant pressure combustion.


Engine Architecture: The architecture of the Clarke-Brayton Engine allows for a large intake bore and a short stroke without the problems of implementing this geometry in a traditional engine. It allows for a very attractively shaped combustion chamber with a shape-factor closer to one, allowing for less heat-loss during combustion.

Compression Ratio: High compression ratio is key to extracting more efficienty from an engine. The CCI uses a 56:1 compression ratio compared to 12:1 for gasoline (Otto Cycle) engines and 18:1 for diesel engines.


Sources of Power Density


Engine Architecture: Three sequential chambers allow for large bore compared to stroke enabling smaller engine size without compromising on combustion chamber shape or friction.

Themodynamic Cycle: The Clarke-BraytonEngine is a four-stroke engine, yet there is a power stroke every revolution like a two-stroke. This allows an engine that meets the strictest emissions standards while remaining compact and light.