CREATE TABLE table_62892 ("Driver" TEXT, "Entrant" TEXT, "Constructor" TEXT, "Time/Retired" TEXT, "Grid" FLOAT)

What constructor has a grid less than 21, and time/retired of engine?
SELECT "Constructor" FROM table_62892 WHERE "Grid" < '21' AND "Time/Retired" = 'engine'
SELECT "Constructor" FROM "table_62892" WHERE "Grid" < '21' AND "Time/Retired" = 'engine'