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Preheat oven to 350 degrees.
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Grease and flour a 12 cup bundt or tube pan.
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In a medium bowl, combine the 2 1/2 cups flour with the baking powder and 2 tsp of cinnamon.
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In a large bowl, toss the apples with 1/4 cup sugar and the remaining 1 tsp of cinnamon and set aside.
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In a standing mixer fitted with a paddle attachment, beat the 1 cup of oil with the eggs, orange juice, vanilla and remaining 2 cups of sugar on med speed for 1 minute.
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Add the flour in 3 batches, mixing until just combined.
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Add the apples and stir to combine.
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Transfer to the pan, leaving about an inch from the top, bake until golden and a toothpick inserted into the cake comes out clean, about 1 1/2 hours.
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Let the cake cool in the pan for about 30 minutes before unmolding it onto a rack to cool completely.