CREATE TABLE table_28014 ("Class" TEXT, "Firebox" TEXT, "Cylinder size" TEXT, "Valves" TEXT, "Valve gear" TEXT, "Number built" TEXT, "Years built" TEXT)

What was the cylinder size of this engine that was made with only 88 pieces?
SELECT "Cylinder size" FROM table_28014 WHERE "Number built" = '88'
SELECT "Cylinder size" FROM "table_28014" WHERE "Number built" = '88'