Claimed and Measured Performance

Efficiency 0.25 lb/h /hp is claimed - about the same as a very good diesel engine, roughly twice as efficient as the best two strokes. This is equivalent to a thermodynamic efficiency of 55.4%, which is an exceedingly high figure for a small IC engine. In the test witnessed by a third party the actual fuel consumption was 1.1 hp/lb/h , or 0.9 lb/h/hp, equivalent to a thermodynamic efficiency of about 12.5%, which is typical of a 1920's steam engine.

Power to weight 2.5 hp/lb is claimed, roughly twice as good as the best shown here. No independently witnessed test to support this has been documented.

Emissions Virtually no hydrocarbons (80 ppm) or carbon monoxide (less than 10 ppm). (confirmed tests). If the design is correct then NOx emissions can be minimised as well, see HCCI engines.

Zero Emissions The engine is claimed to operate on hydrogen as a fuel without any modifications, causing only water and nitrogen dioxide as the emissions.

It should be noted that the high power to weight and efficiency claims have not been demonstrated on a running engine in an independent test. Such figures are regularly claimed for experimental engines, by the time they reach the outside world the performance falls back into line with engineering expectations, as demonstrated in the witnessed test. Any emissions generated cannot be cleaned up with a conventional catalytic converter, due to the low exhaust temperature, of less than 100°C (212° F). A conventional engine runs its catalytic converter at approximately 700-900°C.

Bourke engine - Bourke engine critique - Bourke engine design features - Bourke engine operation - Bourke engine performance

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