Combine 2 cups water, salt, sugar, and chili powder in large nonreactive pot. Bring to boil, stirring to dissolve salt and sugar.
Remove from heat.
Add 6 cups cold water. Cool brine completely.
Add pork chops, pressing to submerge. Cover pot; chill at least 6 hours and up to 1 day.
Prepare barbecue (medium-high heat).
Drain pork; pat dry with paper towels.
Brush pork on both sides with oil; sprinkle with pepper. Grill pork to desired doneness, about 10 minutes per side or until instant-read thermometer registers 150°F for medium.