Preheat oven to 180 degrees C. Grease and flour one 25cm ring tin.
Combine the ground cinnamon and 5 teaspoons of the sugar together and set aside.
In a large mixing bowl combine the flour, salt, baking powder and 2 cups sugar. Stir in the vegetable oil, whisked eggs, orange juice and vanilla. Mix well.
Pour half of the batter into the prepared cake tin. Top with half of the sliced apples and sprinkle with half of the cinnamon sugar mixture. Pour the remaining batter over the top and layer the remaining sliced apples and cinnamon sugar.