Preheat oven to 350F. Mix together cinnamon and 5 tablespoons sugar. In a large bowl, sift flour, baking powder and sugar. Add the oil, eggs, juice and vanilla. Beat together until smooth. Pour 1/2 batter into a greased tube pan; add 1/2 the apples, sprinkle with 1/2 the sugar/cinnamon. Add the rest of the batter, apples and sugar/cinnamon. Bake for 1-1/4 hours. Remove from pan after it has cooled for 15 minutes.