The traditional diesel engine suffers from high emission levels of nitrogen oxide and particulate matter.A new injection concept has therefore been developed and investigated. To enhance the air-fuel mixing process and avoid local concentration of fuel, the injection direction of each spray is varied during the injection event. This was achieved by rotating the injector. In this test, the rotational speed was 1700 rpm.On a six-cylinder engine, one cylinder was equipped with the new injector and exhaust gases were sampled with a new type of valve, integrated in the exhaust-valve stem of the affected cylinder.Tests show that the combustion is significantly affected by the rotating injection. The impact of the rotating injection on smoke, emissions and heat release was repeatable but dependent on loadpoint. No universal trend over all loadpoints was found. NO levels were mostly lowered but for smoke and CO, both lower and higher levels than without rotation were encountered. Co-swirl injection could simultaneously decrease CO, smoke and NO emissions for one of the observed loadpoints.The indicated efficiency was not significantly affected.