CREATE TABLE table_80209 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Which engine did dr ing f porsche kg use with the porsche rsk (f2) chassis?
SELECT "Engine" FROM table_80209 WHERE "Entrant" = 'dr ing f porsche kg' AND "Chassis" = 'porsche rsk (f2)'
SELECT "Engine" FROM "table_80209" WHERE "Chassis" = 'porsche rsk (f2)' AND "Entrant" = 'dr ing f porsche kg'