CREATE TABLE table_35997 ("Code" TEXT, "Vehicle" TEXT, "Year" TEXT, "Displacement" TEXT, "Bore" TEXT, "Stroke" TEXT, "C.R." TEXT, "Max. Power" TEXT)

What displacement has the code yd22ddt?
SELECT "Displacement" FROM table_35997 WHERE "Code" = 'yd22ddt'
SELECT "Displacement" FROM "table_35997" WHERE "Code" = 'yd22ddt'