Grease and flour a Bundt pan. Peel, core and chop apples into chunks. In a medium bowl, toss with cinnamon and sugar. Set the apples a side.
Sift the flour into a large bowl. Then, add the baking powder and salt in a large mixing bowl.
In a separate bowl, whisk together oil, orange juice, sugar and vanilla. Mix wet ingredients into the flour mixture, then add eggs, one at a time. Scrape down the bowl to ensure all ingredients are mixed together.
Fold in the cinnamon sugar mixture and apples.
Pour the batter into the prepared pan.
Bake for about 1 1/2 hours, or until a tester comes out clean.