I was just wondering, what is the maximum Attack Damage you can get on a character if you picked the one with the highest based damage at lvl 18 and just stacked AD on them? I guess this would be the ultimate glass cannon :P.
Besides Sion with Atma's Impaler (due to his Enrage), the maximum attack damage any champion can get at level 18 is 1364, being Malphite with Brutal Strikes active, all Might runes and the Brute Force and Summoner's Wrath masteries with Ignite on cooldown, a fully stacked Sword of the Occult and 5 other fully stacked Bloodthirsters, while having the Exalted with Baron Nashor, Aegis of the Legion, Raise Morale, Eye of the Storm, Radiance, Hymn of Valor and Elixir of Fortitude buffs.
http://euw.leagueoflegends.com/board/showthread.php?t=237325. technically no there is not an AD cap but since there is a cap on how many items you can buy it is sort of capped i guess.