Abstract: Diesel engine conversion kit wherein said kit arranged at the engine air inlet of a diesel engine to be transformed, comprises three different pieces defining an air inlet means, gas feeding means and flux regulating means. Said air inlet means comprises a hollow cylindrical piece with a central narrowed position affixed to said gas feeding means. Said gas feeding means comprises passages whose arrangement coincides with the arrangement of the above cited inlet. Inside said passages feeding gas tubes including long gas exit grooves, are lodged. Finally said flux regulating means comprises a plate with two feeding passages in coincidence with the above cited passages of gas feeding means, each including choker plates with a common regulating means.