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Blend flour, sugar, baking powder, and salt together in a large mixing bowl.
Make a well in the center of dry ingredients. Add vegetable oil, unbeaten egg yolks, water, and vanilla. Mix with a wooden spoon until smooth.
Measure into a large bowl egg whites. Beat until frothy, sprinkle with cream of tartar. Continue beating until very stiff peaks form (do not underbeat).
Individually fold batter into egg whites. Turn batter into a 10-inch tube pan. Cut batter with a knife to eliminate air bubbles.
Bake in oven for 325 degrees for 1 hour to 1 and 1/4 hours.
Invert cake immediately from oven over a bottom of glass
Replace 3/4 cup water with orange juice and 1/4 cup water
replace vanilla for lemon rind
replace 1 tbsp water with lemon juice
Add all to the dry ingredients