WJ Kavanaghs have 5 engines, normally 2-4 on (weekends 4)
Black Sheep have 4 engines, normally 2-3 on
Porterhouse Temple Bar have 2 engines and a counter top cask, I think all three are on? (they were the last day i think)
The Bull and castle, mulligan's, brew dock and farringtons all have one...
I'm sure I've forgotten a few pubs...