Preheat oven to 350 degrees.
Combine the pineapple, chipotle peppers, honey, & ginger together in a small saucepan & bring to a slow boil. Turn the heat to low & simmer for about 15 minutes.
Salt & pepper the pork loin to taste. Place the roast on a roasting rack, and pour 3/4 cup of water in the bottom of the pan. Drizzle 1/2 cup of the glaze over the roast. Cover tightly with aluminum foil.
Bake until the internal temperature reaches 135 degrees using an internal thermometer. Remove the tinfoil, pour another 1/2 cup of glaze on top and continue cooking until the internal temp reaches 150. Remove from the oven & let rest for 15 minutes. It will continue cooking a little & reach the right temp by then.
Slice the roast, and serve with the additional glaze.