my 24v build, slightly different than the norm. Now with dyno numbers!

[MyE30]

Loving that aluminum block. Your motor build is looking great!
I don't understand why BMW used iron blocks for so long.

[10Toes]

84mm M52b28 crank
135mm M52b28 rods

Left piston M50b25tu--------Right piston M52b28
~11.2:1 --------------------- stock 10.2:1



Hard to tell in that pic but it looks fine/close to what it should be.

[2mAn]

new rings, new bearings, new rod bolts en route to the machine shop, this thing should be done in 2014. fingers crossed... my new motto. do it right AND do it twice!! ballin.gif

[e30austin]

Man, that's fucking shitty. I wouldn't know what to even do if I were in your shoes. Why I hate hate hate having other people do shit for me.

[2mAn]

He still has the stock pistons somewhere if I remember our conversation right. Im waiting to hear back from the machine shop anyday now. They got the motor late last week and said they would be tearing it apart sometime this week.

[328ijunkie]

First ones look like S52 pistons, 2nd ones look like M52 pistons but i dont recall M52 pistons rising that much.. I know M50 pistons run way under deck and i know S52s go overdeck slightly but dont remember how M52 stockers run off the top of my head...

[2mAn]

Did you check for interference post assembly at max lift?

Piston solo shot has a cavity in the top

Pistons installed in block have flat tops

Would seem to be quite different compression with same head/rod/crank as the middle of the first one is a bowl.

Sent from my iPhone using Tapatalk

No, I never did. I assumed ( ) that since I ordered factory overbore pistons that I wouldnt need to. I also double checked with TMS that I was sent the correct pistons because my mechanic mentioned they looked different. TMS told me they sent the right pistons so we proceeded. The pistons were sent to me directly from Wiseco though, not TMS so an error could've been made. I never thought to look closely until just now

[Wanganstyle]

my 24v build, slightly different than the norm

went back through these pics and noticed something.... anyone else see what I see??????

First set of pistons is the S52 pistons TMS sent me and I had to return them because they werent the correct bore.

Second set of pistons were the "M52" pistons. My machine shop guy thought they werent the right pistons, but TMS assured me they were the correct ones.

Anyone else think this difference couldve caused piston/ valve contact???

Did you check for interference post assembly at max lift?

Piston solo shot has a cavity in the top

Pistons installed in block have flat tops

Would seem to be quite different compression with same head/rod/crank as the middle of the first one is a bowl.

Sent from my iPhone using Tapatalk

[2mAn]

wiseco-pistons by 2mAn

piston_plus_rod by 2mAn

block finished3 by 2mAn

block finished2 by 2mAn

went back through these pics and noticed something.... anyone else see what I see??????

First set of pistons is the S52 pistons TMS sent me and I had to return them because they werent the correct bore.

Second set of pistons were the "M52" pistons. My machine shop guy thought they werent the right pistons, but TMS assured me they were the correct ones.

Anyone else think this difference couldve caused piston/ valve contact???

[2mAn]

Motor got pulled today and will be at the machine shop tomorrow. I plan on taking a trip up in the next month or two to clean up the engine bay, maybe do a quick shave and spray. Whether or not I move the car will be decided before I go up. Everything related to swapping a 24v in is already done, so I dont think the mechanic will be too upset if I get the car out of there. Im sure he is tired of looking at it. Who knows for now though.

[2mAn]

If worse comes to worse I have some extra garage space, you could tow it over here to finish up without having to pay more shop time...

That is almost where Im at. He has basically done the hard part, wiring is all done, subframe is modded to fit the downpipe, brakes/ booster is done. Now its just pulling the engine, letting the machine shop do ALL of the work and then reinstalling it. I'm not going to make the same mistake twice, the machine shop will keep my engine and put it ALL together, so when I get it, I know its good to go. Honestly, I would rather have the mechanic finish it, but it seems like it is pointless now. I am expecting to hear from him tomorrow since that's when he told me he would be pulling the engine and taking it to the machine shop. Its been sitting since I got the bad news, I have no expectation on when I will actually be driving the car so that way when its done, its done.

[iansane]

Dude. That is redonk.

If worse comes to worse I have some extra garage space, you could tow it over here to finish up without having to pay more shop time...

[charlie2309]

Wow. I would have used the m54b30 RA like you wanted in the beginning, but got talked out of. Pretty sure you'd be driving the car right now. Thank god you avoided those "harmonic" issues by going with this setup.

A properly balanced 3.0 assembly would be FINE in that block, peak power occurs at 5900, so why anyone is concerned with anything above that is beyond me, unless its a tracked car. Especially when the real story is the torque advantage, where a street driver will actually benefit. But whatever. You 2.8'd the hell out of it, looks like.
Anyway, I feel pain for you. I really do.
hope you fare much better from here

[328ijunkie]

wtf.

[2mAn]

Had a long talk with the mechanic and Im basically back to square one. Apparantly the valves and pistons had some contact and now the motor needs to get taken apart again. We arent really sure what happened, but they think the pistons could be the culprit. Im beyond frustrated right now, because I have tried extremely hard to do this build right and not cut any corners and Im still fucked. Motor will get pulled next monday and is going back to the machine shop to get torn down and see exactly what happened. I dont know who will be liable, but he is saying because I was the one who torqued the head down, its basically on me. I did very little work myself and it just happens to be the piece that has any liability tied to it. I've lost motivation, but I cant really do anything except keep going at this point. I've got so much money wrapped up into this that there is no way out....

Whats really frustrating is that I feel like my relationship with this mechanic has gone to shit. He is frustrated with me, because I was missing parts, which was a miscommunication on my end and he had to spend time researching and buying all new parts. Its not like he did it as charity, I paid him his shop rate for him to do that. He is frustrated because he had unexpected issues to deal with, which I also wasn't aware of. He is tired of hearing me complain and be upset, but how else am I supposed to feel when this has gone to nearly double the hourly time ( I was told ~30 hours originally, and we're at 56 and counting) and the budget is blown out of the water, and we still dont have a completed car, in fact we are several steps back now. I have lost sleep over this because being two states away I have very little control over the progress, I just have to sit and wait... and pay...