In a large bowl, combine the oil and cinnamon. Add egg yolks, flour, baking powder, sugar and grated apples. Stir well to combine. Beat the egg whites to a light froth and stir into the mixture carefully.
2Bake in a lightly oiled 11 1/2" round pound for 45 minutes, or until a knife inserted into the center comes out clean.
3If the top of the cake browns too quickly, cover with foil until the cake is done.