The five-stroke concept – ingeniously simple, simply ingenious

A high level of turbocharging and further expansion in the low-pressure cylinder
enable a high power density and low consumption over the whole working range.

The 5-stroke engine is smaller, lighter and more economical!

This is how the 5-stroke concept, invented by Gerhard Schmitz, works.

You can find this animation and others in HD resolution on the YouTube fuenftaktmotor channel.


5-stroke cycle

Mario Illien NZZ

More results coming soon...

The 5-stroke engine built in 2007 by the English company Ilmor Engineering Ltd. was a simple test bed engine without any complex engineering; it immediately produced a measured specific fuel consumption of 226 g/kWh. This level of consumption is not achieved by even the most modern Otto-cycle engines.

In 2009 a German car manufacturer simulated a 5-stroke engine of 2-litre capacity using the GT-Power software and calculated a specific fuel consumption value of 204 g/kWh. This value was also based on a       
simple test bed engine without modern engineering features such as e.g. variable valve timing or direct injection. This value cannot be achieved by Otto-cycle engines. Only modern car diesel engines are able to achieve such low specific consumptions.

In its first version the 5-stroke engine is already more efficient than the most modern Otto-cycle engines and with consistent further development can potentially undercut the levels of consumption of modern car diesel engines.
> Discover more from the comparison of the engine concepts.
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