Mix sugar, eggs, oil, flour soda, salt, and cinnamon together. Add carrots, pineapple and nuts and mix well. Bake in an oblong cake pan which has been greased and floured. 350 dedgrees for approximately 1 hour or until toothpick comes out clean when cake is tested in the middle. While cake is still hot, pour topping over cake. Topping: Boil and stir constantly all the topping mixture except for the soda for 8 minutes. Add soda and boil until clear. Spoon over cake while hot. Let cake cool before serving.