CREATE TABLE table_31600 ("Name" TEXT, "Cyl." TEXT, "Bore" TEXT, "Capacity" TEXT, "Power" TEXT, "Weight" TEXT)

What is the bore for a 9-cyl radial on a 9 AD?
SELECT "Bore" FROM table_31600 WHERE "Cyl." = '9-cyl radial' AND "Name" = '9 ad'
SELECT "Bore" FROM "table_31600" WHERE "Cyl." = '9-cyl radial' AND "Name" = '9 ad'