CREATE TABLE table_15718 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Points" FLOAT)

What was the engine when the chassis was a porsche 718??
SELECT "Engine" FROM table_15718 WHERE "Chassis" = 'porsche 718'
SELECT "Engine" FROM "table_15718" WHERE "Chassis" = 'porsche 718'