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Preheat oven to 350 degrees and place one rack in the upper third of oven and one in the lower third of oven. Use a paper towel to wipe the pans with butter and then sprinkle lightly with a little flour. Make sure to lightly cover bottoms and sides of pans.
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Use a potato masher to mash bananas.
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In a large bowl combine flour, sugar, baking soda, cinnamon and salt. Whisk to combine.
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Add eggs and coconut oil, mix till combined.
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Add pineapple, banana, vanilla, and 1 cup nuts. Mix well.
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Pour as evenly as you can into the three prepared cake pans.
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Set two pans on upper rack and one on the center of the lower rack. Bake for 25-30 minutes total, switching the pans at the halfway mark (switch pans on bottom rack to top, and the top to bottom). When done, remove from oven and allow to cool for ten minutes before removing cake from pans.