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Guys, don't pay so much attention to the preflop raise. The turn is where the real mistake is.

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Exactly. Why are you not taking a free card on this turn? Are you trying to buy the pot right there versus three other players? Given that board, there are a number of straight and flush possibilities, most of which aren't folding. Also, no one with a 5 is folding, and it's unlikely that a 9 folds either. As for your equity, the 4[img]/images/graemlins/heart.gif[/img] may give someone else a boat, and someone may also have a pocket pair, so it's highly unlikely that all nine [img]/images/graemlins/heart.gif[/img]s are good. The chances of winning by spiking an ace aren't very good considering your weak kicker, which wouldn't even play. You'd be looking at a split pot or nothing versus another ace. Pairing your 8 probably doesn't win the pot either.

There has been a lot of discussion about the preflop raise, but I'm really curious about OP's reasoning behind betting the turn rather than checking.