M50 Stroker, What do you suggest?

[e30this]

negative

What he said... :(

It actually became one problem after another, I just gave up..

If I told you the whole story you would prolly shit and gave up long before I did...

[Bmjpv]

What to do ,again ?

Funny how this stuff pops up when you need it. I'm at that exact point on what to do with my blownup/builtup s52. Last week with only 20k miles on engine my #3 Maxcel piston let go at low RPM . Felt something at cruise 3500rpm ,put in clutch,engine died,coasted to offramp. Restated rough,made about 3seconds of running and locked. Water and than oil later leaked out of the bottom of the dip stick overnight. Pulled the head and as I feared no piston,no cylinder wall and almost no damage to the head (caught small parts in 2valves) . I think the cylinder wall was too thin , And will never know. Next time stock s52 pistons in a block . Keep this thread going as it's contents are the core of our dreams . Joe

[Bmjpv]

What to do again?

So I'm thinking the second time around I might want to do the z3 aluminum block.I'd use my s52 crank and 135mm rods into the z3 block with the stock z3 pistons. Does this combo work ? I've searched and have not been clear on anyone using this combo. Is it as streight up as some make it sound doing ? Other direction is to just get a m50 block (again) this time using standard s52 pistons. On the M50 blocks, are the non vanos really thicker or just an old fish wifes tale ?? Thanks , Joe

[lifeiskaos]

that does not work. you need to use m54 pistons if you're going to use s52 crank and 135mm rods. but do the iron block. i'm the only one allowed to use my aluminum block

[Bmjpv]

What to do again?

So the aluminum block will take s52crank,135rods and stock m54 pistons OR the iron block, s52 crank ,135 rods and stock s52 pistons . With all other boltons being the same is it a tossup as to best power/torque ? Please shine more lite on this for me. Thanks , Joe

[e30this]

I have the M54 rods FS also. Along with all new bolts minus one. Got lost in shipping.
Let me know I will send you photos..

[MIKe30]

I have stock set of s52 pistons with only 83k on them and brand new rings. I ended up using high comp pistons so no longer needed these. pm if you're interested.

[e30this]

I have stock set of s52 pistons with only 83k on them and brand new rings. I ended up using high comp pistons so no longer needed these. pm if you're interested.

Get outa here mike. You got a job that you collect a check from every week.
I sell parts to collect a check every week.

[Bmjpv]

What to do again?

Great info so far , anyone to add what they know ?? Thanks, Joe

[sharksforthecup]

Funny how this stuff pops up when you need it. I'm at that exact point on what to do with my blownup/builtup s52. Last week with only 20k miles on engine my #3 Maxcel piston let go at low RPM . Felt something at cruise 3500rpm ,put in clutch,engine died,coasted to offramp. Restated rough,made about 3seconds of running and locked. Water and than oil later leaked out of the bottom of the dip stick overnight. Pulled the head and as I feared no piston,no cylinder wall and almost no damage to the head (caught small parts in 2valves) . I think the cylinder wall was too thin , And will never know. Next time stock s52 pistons in a block . Keep this thread going as it's contents are the core of our dreams . Joe

What was the block bored to?

[lifeiskaos]

So the aluminum block will take s52crank,135rods and stock m54 pistons

yes. you'll be at 3.0 liters and just over 10:1 compression ratio

OR the iron block, s52 crank ,135 rods and stock s52 pistons . With all other boltons being the same is it a tossup as to best power/torque ? Please shine more lite on this for me. Thanks , Joe

this combo also works. if you want the most torque, you definitely want an iron block with s52 pistons. "there's no replacement for displacement" therefore 3.2 > 3.0

[Bmjpv]

bore size?

Well the block started as a 94' m50 ,e36 auto. Pistons were the MaxCel s52s 20 over. Factory fresh S52 crank ,135 rods . No I did not sonic the block. I had about 20k miles on the engine Don't know if piston failed or cyl failed . Crusing at 3500rpm for about an hour. I quessing the piston failed because the cyl wall was very complete when I plulled the head(see pics), what do you all think ?? Joe

[alexbaby88]

http://forums.bimmerforums.com/forum/showthread.php?t=1254714