Peel, core, and chop apples into small pieces. Mix together with 3 tablespoons sugar and cinnamon. Set aside. In large bowl, combine sugar and cooking oil; beat. Add eggs, orange juice, and vanilla. Sift together flour, baking powder, and salt; add to creamed mixture. Beat until smooth. Pour one third batter into greased and floured dozen cup bundt pan alternating with one half apple mixture. Repeat. End with layer of batter on top. Bake at 160ºC for 60 minutes or until cake tests done. Cool in pan 10 to 15 minutes; turn out on wire rack or serving plate to complete cooling. Sprinkle with confectioners sugar.