Blackburn Cycle Engine

A quick and easy way to test the fuel efficiency gain of the 'Blackburn Cycle'

Obtain a single cylinder, direct injection, petrol engine.

Modify the fuel injection timing to half the usual frequency i.e. fuel injection on alternate 4 stroke cycles and optimise the engine settings.

Run this engine at full throttle in 'Blackburn Cycle' mode with maximised alternate 'air only' inductions.

Repeat the above for various speeds, but always full throttle 'Blackburn Cycle' mode, and record the fuel consumption and power.

Change this engine back to standard with fuel injection on every 4 stroke cycle.

Compare the fuel consumption of the 4 stroke and the 'Blackburn Cycle' at identical loads and RPM.

You will see that the 'Blackburn Cycle' is more fuel efficient than 4 stroke.

The above set up will not show the full efficiency gain if you test lower loads below full throttle 'Blackburn Cycle' mode, because the throttle will be partly closed. This increases pumping losses and reduces the 'air only' intake which reduces all the advantages provided by maximised alternate 'air only' inductions.

A 3 or 5 cylinder engine can be used, but an odd number of cylinders is essential for smooth running in both modes.

When you see a large efficiency gain for yourselves this should encourage you to run larger scale tests using the variable speed version of the 'Blackburn Cycle' which will deliver much larger fuel efficiency gains as speed and load reduce.

If you have a camless research engine it should be possible to test the whole range of speeds and loads using software changes.

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