Combine chopped pears, sugar and pecan pieces in a large bowl and let sit for 1 hour. Stir often to let the juice of the pears release. This is an important step in achieving a moist cake.
Pre-heat oven 350º F. Grease and flour bundt pan or use baking spray.
Combine flour, cinnamon, nutmeg, allspice, baking soda and salt in a bowl then add to pear mixture.
Add oil and vanilla to beaten eggs, then stir into the pear and flour mixture.
Pour cake batter into a prepared bundt pan.
Bake at 350º F for about 1 hour.
Let cake cool for about 5 minutes, then invert onto a cooling cake rack.