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Cyclone Power to Showcase External Combustion Engine at SAE Event

Cyclone Power Technologies will showcase two automotive applications of its external combustion Green Revolution Engine (earlier post) at the upcoming SAE Commercial Vehicle Convention in Chicago. The company will display a 100 hp Automotive Engine and a 330 hp Truck Engine, which will be installed in a full truck chassis for the first time.

Cyclone’s engine is a multi-fuel capable engine that uses an external combustion chamber to heat a separate working fluid, de-ionized water, which expands to create mechanical energy by moving pistons or a turbine.

The engine’s combustion chamber creates a rotating flow that facilitates complete air and fuel mixing and complete combustion. Less heat is also released. Exhausted gases run through a heat exchanger before leaving the engine, lowering the temperature at release.

The company proposes a number of configurations of the engine, including small single-cylinder units; a two-cylinder opposed piston engine; and three-, four- and six-cylinder radial engines.

The company most recently concluded its testing with low octane gasoline. The design of Cyclone’s fuel injector, which works with a primary and secondary air source, maintained a low temperature flame front with an extremely clean burn, according to the company.

As a result of the low temperature burn of the gasoline, the Cyclone engine produced little or no NOx, and kept carbon monoxide levels at a minimum. Additionally, the cylindrical design of the engine’s combustion chamber effectively eliminated much of the unburnt hydrocarbons from the fuel source, according to the company.

Cyclone has also tested a bio-fuel, d-Limonene, made from orange peels; biodiesels produced from palm oil, cotton seed oil and chicken fat; and three grades of ethanol produced from corn.


One last comment on Cyclone efficiency. I expect the Cyclone to operate near its peak efficiency over a much wider power band than IC engines and even conventional steam engines. Again this is ideal for automotive applications. The extremely high steam pressure and superheat in the Cyclone allows for high expansion even where full cylinder pressure cannot be established. Remember, it's all about expansion. The max compression ratio of 27:1 could be maintained over a fairly wide speed range. Torque would fall as speed increases due to the inability to establish full steam pressure at higher speeds, but 27X expansion is still possible with steam pressures far lower than 3200 psi. Hopefully the engine is geared ideally such that highway speeds on level ground corresponds to the engine speed at which max compression is maintained. This would provide max mpg. Want to pass a car or go up a steel hill? Pressing the accelerator lowers the compression ratio to dump more steam into the auxiliary cylinder effectively raising mean effective cylinder pressure, torque, and power at that speed... with some drop in efficiency.

Also, the heat regenerative characteristics of the power plant helps to mitigate or buffer significant variations in efficiency over the power range.


If there's a way to edit posts here, then someone please let me know how so that I don't keep making annotations. I am adding this clarification to a prior post about the "reheat stage"... the way I wrote it suggests that the compressed steam reenters the primary steam generator coil... well that's silly, I should have emphasized that there is a second volume provided to accept the compression during the "reheat stage". So, there's good reason to have been confused after reading it.


Will it run at 6000 feet as good as it does at sea level? Will it have to be re-jetted to the altitude? Less air, less O2. With verious fuel types, it could be tricky.

Larry White

Ok, as a former airline aircraft mechanic and helicopter
plant engineer, I see great potential for this engine to be adapted around the world. But, as a businessman/investor, can this engine and the intellectual property be protected and thus protect the investors?
2. Where does the owner/operator get low cost deionized water and how much is required per 100 miles?
How do you insulate the water tank for parking outside in Indiana in the winter?

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