PokerStars Pot-Limit Omaha/8, $4 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FCP)

Hero ($537.75)
CO ($404.50)
Button ($188.50)
SB ($1020.05)
BB ($404.50)
UTG ($379.50)
UTG+1 ($129.10)
MP1 ($331.10)

Preflop: Hero is MP2 with 2 , 8 , A , Q .
1 fold, UTG+1 calls $4, MP1 calls $4, Hero calls $4, 2 folds, SB completes, BB checks.

Flop: ($20) 4 , Q , 3 (5 players)
SB checks, BB checks, UTG+1 bets $16, MP1 folds, Hero calls $16, SB calls $16, BB calls $16.

Turn: ($84) 7 (4 players)
SB checks, BB checks, UTG+1 bets $68, Hero raises to $136, SB calls $136, BB folds, UTG+1 calls $41.10 (All-In).

River: ($465.10) 4 (3 players, 1 all-in)
SB checks, Hero bets $381.75 (All-In)???

I read SB as weak here, having check/called all the way. I think he's got low only, and I think my Q is good. Am I out of my mind?

What if you're wrong and he has a24j or something like that? there are quite a few hands that will have YOU being quartered, so if you're not positive that you can WIN at least half a pot (good boat, or flush) why play it big? it's a decent size pot anyways, so why risk getting quartered. i'd prolly bet around 200 there, you have a better chance of getting called by something that you can WIN against. you're all in bet will most of the time get called only when you are getting quartered or if you chop it up.

depends on your read of the guy, and whether or not you feel like winning big or just making a decent profit.

I can almost guarantee he's quartered for the main or side pot. He's thinking about making another side pot.

I don't think it's a re-donkulous play since you should make money doing this over the long run. I check behind, but ISAP and I play 1/2 PLO8 where people aren't as aggressive.

now sitting back to see what more experienced players think............

Ding ding ding. I think I'm getting quartered on the main pot, I want to get a side pot going with the guy who's only been check/calling the whole way.

i raise the flop with that kind of hand and that many players. you have a good hand buts its kinda weak multiway.

No, you are not out of your mind. Getting 3/4 of the (big) side pot is probably the only way you will come out ahead on the hand - or by getting him to fold.