Preheat the oven to 350 ° F.
Bring eggs to room temperature by placing them in a bowl of warm water for 10 minutes.
In a large bowl combine dry ingredients: flour, sugar, salt and baking soda.
In a separate bowl add orange juice, egg yolks, oil and zest. Whisk together.
Pour the wet ingredient mixture into the dry and whisk until incorporated.
In a clean, oil free glass bowl beat egg whites and cream of tarter on high speed until stiff peaks form.
Fold egg whites into batter until no streaks are there, scraping the sides of the bowl.
Lightly grease only the bottom on the tube pan or 2 nine inch round pans.
Carefully and gently spoon the batter into tube pan.
Drag a butter knife through the batter to release any air pockets and bake for 45-50 minutes.
You will know it’s done when the top springs back when lightly touched.
Gently set the cake (still in the pan) on wire racks to cool completely (40-50 minutes).
Gently glide a knife around the sides and center of the pan to release the cake.
Place serving plate on top of pan and flip the cake over.