Preheat oven to 180C / 375F. Grease and line a 22 cm deep springform cake tin. Set aside.
Sift flour, baking powder and salt into a large bowl. Set aside.
Place eggs in a large bowl. Using an electric mixer, beat at medium-high speed for about 1 minute or until just combined.
Add sugar. Beat until thick and pale.
Add ¼ part of flour mixture and half of olive oil. Beat until combined.
Add the remaining flour and oil alternately, starting and ending with flour.
Add orange zest and juice. Beat for about 2 minutes or until just combined.
Pour batter into cake tin. Bake for 1 and ¼ hours or until a skewer inserted into the center of the cake comes out clean.
If the top of the cake starts to brown too quickly, cover the pan with foil loosely.
Turn onto a wire rack to cool completely.
Dust with powdered (icing) sugar and serve with a dollop of whipped cream.