In a large mixing bowl combine flour, baking powder, baking soda, salt, and cinnamon. Make a well in the center of the bowl. In a separate bowl combine the oil, eggs, sugar, grated pears, pecans, and vanilla. Blend well. Add to well of dry ingredients. Stir until just moistened. Spoon batter into 2 greased and floured 8x5x3 inch loaf pans. Bake in a preheated 325 degree F (165 degrees C) oven for one hour and 15 minutes. Cool on wire rack before removing from the loaf pans.