CREATE TABLE table_68734 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Which engine did lie Bayol use when they earned 0 points?
SELECT "Engine" FROM table_68734 WHERE "Points" = '0' AND "Entrant" = 'élie bayol'
SELECT "Engine" FROM "table_68734" WHERE "Entrant" = 'élie bayol' AND "Points" = '0'