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2 Stage Unit Injection

STEYR MOTORS diesel engines are manufactured using integrated high pressure unit injectors up to 2000 bar with dual stage fuel injection, operated by overhead camshaft and rocker arms.

This process allows for the first stage of the unit injection to initate a fuel burn whilst the second stage delivers the required amount of fuel for that stroke. As combustion has already taken place when the main fuel quantity has been delivered, the ignition is soft and the burn is clean. The result is the elimination of black smoke and diesel knock provides a smooth and quiet ride. The unit injection system guarantees a diesel engine intended to withstand the harsh environment and continuous loading experiences in marine applications.

The unit injectors are also capable of operating on a variety of fuel types including Biofuel making the engines suitable for military and commercial operations where multifuel capability is required.