Preheat oven to 325 degrees. Mix flour, sugar, baking powder, and salt in a mixing bowl. Make a well in the center and add in order- vegetable oil, egg yolks, water, orange zest, and vanilla extract. Beat with a spoon until smooth. In another bowl, beat the egg whites with the gream of tartar until stiff peaks form. Pour the flour/egg yolk mixture gradually over the beaten egg white and gently fold the two mixtures together to form the cake batter. Pour the cake batter into an ungreased, 10 x 4 inch tube pan. Bake for about 1 1/4 hours until the top of the cake springs back when lightly touched. Invert the cake pan and allow the cake to hang whild cooling down. When the cake is cold remove from the pan and frost witht he Orange Butter Cream Frosting.
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