The Eco-Runner H2
This new Eco-Runner is called the Eco-Runner H2. Its main improvement with respect to the first version is its completely integrated design. This results in an extremely aerodynamic shape and a light weight of the vehicle. On top of that the team is developing two propulsion methods for this new Eco-Runner H2, actually resulting in two Eco-Runners H2.
The first propulsion method comprises a fuel cell driving an electric motor.
The other method is a six-stroke petrol combustion engine. The basic principle of this engine is the same to that of a four-stroke engine but for the injection of a drop of water after the fourth stroke. Due to the extreme heat remaining in the cylinder head, the water will expand rapidly, resulting in a "free" working stroke. The team is aware of this engine's downside, which is the combination of water, high temperature and high pressure, inevitably resulting in a high level over corrosion.
The Eco-Runner H2 participated in the 2007 edition of the Shell Eco Marathon, where it achieved the Dutch fuel efficiency record of 2282 km/l of petrol using the fuel cell set-up (The hydrogen consumption of the fuel cell is monitored carefully by race officials and then converted to the equivalent of a liter of Shell 95 standard fuel using specific combustion heat of both substances). This was despite a hastily repaired and therefore very poorly working cruise control - a feature essential for keeping all of the components at their point of maximum efficiency. The Eco-Runner H2 holds the Dutch fuel efficiency record to this day.
Read more about this topic: Eco-Runner Team Delft