[cahme]

https://mmp-e.com/products/n54-built-engine-program

Looks to start at $4k with N55 core.

[biz77]

Based on the reviews of MMP on other sites I wouldn't let MMP rebuild my lawnmower engine for free.

[SnapCoupe]

Originally Posted by Bours

UPDATE : my engine spun a bearing as some ppl know....my car is at MMP getting rebuit with ceramic coated main bearings., forged rods, forged pistons, and full cleaning of the head. + new seals and gasket...

will get the engine back in 2 weeks and the car ready in three...

the whole process took 3-4 months....i hope its worth it since i have pure stage 2 fbo on meth @

Is there any way to know if your crank journal is warped before they dive into it? If it does end up being warped, is that something they can remedy, or would you have to get a new short block?

The chance of a warped crank journal is what kept me away from rebuilding mine.

[bbnks2]

Originally Posted by SnapCoupe

Is there any way to know if your crank journal is warped before they dive into it? If it does end up being warped, is that something they can remedy, or would you have to get a new short block?

The chance of a warped crank journal is what kept me away from rebuilding mine.

BMW offers bearings for stage 1, 2, and 3 crank repairs. This means it's probably safe to shave as much as .75mm (.03") off the crank to get it back in spec. A bent cast crank might crack if it needs to be straightened if that's what you're asking. My crank turned out to have a crack. These are things you need a machinist to check for. And, you'll have to get the crank shaft out of the motor first.

If the crank turns out to be no good you might as well just hunt for a used motor since a new crank cost $1600. A decent N55 shortblock can be found for <$4k. I chose to just buy a new crank and put in forged internals rather then take a gamble on a used motor. I am close to $5k into it doing all the work myself and paying to have the block bored and inspected. Finding out the crank was bad really blew the budget on the build.

[Bigugly]

Originally Posted by bbnks2

BMW offers bearings for stage 1, 2, and 3 crank repairs.

This is only for the mains, not the rods- which are typically the ones that get hurt.

I hope you have a good experience with MMP- I'm kind of baffled how your car is there, since he doesn't own a shop and outsources his engine work to a shop- but hey, good luck!

[Bours]

Originally Posted by Xdrive35i2014

Did you get your head ported as well? How much did that all cost?

didnt get the head ported cause they said it wouldnt make much more power......cost me about 8k usd

[Bours]

Originally Posted by biz77

Based on the reviews of MMP on other sites I wouldn't let MMP rebuild my lawnmower engine for free.

show me the reviews plz im scared...

[Bours]

Originally Posted by SnapCoupe

Is there any way to know if your crank journal is warped before they dive into it? If it does end up being warped, is that something they can remedy, or would you have to get a new short block?

The chance of a warped crank journal is what kept me away from rebuilding mine.

what bbnks2 said 100% correct

[biz77]

Originally Posted by Bours

show me the reviews plz im scared...

https://www.google.com/search?q=mmp+...w=1305&bih=726

[biz77]

replace the ***** with s p o o l s t r e e t (no spaces obviously)

[Ozzie335i]

Thought I'd share some good results from Blackstone:

Universal averages show typical wear levels for an N55 after about 4,400 miles of oil use.
Compared to those, your metals are reading fairly low and in a healthy balance, which is what we'd expect from a healthy engine that hasn't been modified in the slightest.

Considering I am running Pure 2, Port injection, and 22 + psi, I am good with it. Now if MFactory can sort out my differential, warranty bolt shearing issue, I am good for now.

[Bours]

Originally Posted by biz77

replace the ***** with s p o o l s t r e e t (no spaces obviously)

it has to do with injectors in all the threads.....in my case rebuild was suppose to take 6 weeks and im at week 12.....thats my only complaint...communication and updates are lacking a bit....but if final result is great i guess ill be happy

[bbnks2]

Originally Posted by Bigugly

This is only for the mains, not the rods- which are typically the ones that get hurt.

I hope you have a good experience with MMP- I'm kind of baffled how your car is there, since he doesn't own a shop and outsources his engine work to a shop- but hey, good luck!

There are now several brands of aftermarket rod bearings shells in +1/2/3 sizes. There is no reason to use BMW's bearings and color codes when cutting a crank to fit.

[bbnks2]

Originally Posted by Bours

it has to do with injectors in all the threads.....in my case rebuild was suppose to take 6 weeks and im at week 12.....thats my only complaint...communication and updates are lacking a bit....but if final result is great i guess ill be happy

That's exactly why I didn't send my motor out. I am already 6 weeks into my rebuild though. Unforeseen shit happens when building a motor (like sending out the crank to be cut and finding out 2 weeks later that it's cracked). Then I had to wait another week to get a set of standard bearings to fit the new crank I picked up since it isn't being cut to size.

I could've had the motor back in the car 2 weeks ago. Now I am waiting on a Pure Stage 1 to arrive... "expedited shipping" has turned into 2 week shipping lol maybe longer since it still isn't here.

Oh then I shattered an oil squirter bolt torquing it back into the block. Not exactly a part anyone has lying around. I've gotten the idea out of my head that I'll be back in this car this summer :/

[Bours]

Originally Posted by bbnks2

That's exactly why I didn't send my motor out. I am already 6 weeks into my rebuild though. Unforeseen shit happens when building a motor (like sending out the crank to be cut and finding out 2 weeks later the crank is bad). Then I had to wait another week to get a set of standard bearings to fit the new crank since it isn't being cut to size.

I could've had the motor back in the car 2 weeks ago. Now I am waiting on a Pure Stage 1 to arrive. "Expedited shipping" has turned into 2 week shipping lol maybe longer.

yea same happened....they sent the crank and it came back bad...they to had to send it back to a better shop to grind it again....i have to rent a car and its costing me a lot...
i rly hope everything is perfect in the end...

[Bigugly]

Originally Posted by Bours

didnt get the head ported cause they said it wouldnt make much more power......cost me about 8k usd

You're kidding me, right?
That's ridiculous lol
Our N55 head flows nearly identical numbers as our N54 head, and they make 650hp at 23psi, and over 800 at 30.
We run out of octane with 93 at 16-17psi, vs a stock head at 19 on a single turbo.
A stock head makes 650hp at 30psi, for reference

[Bours]

Originally Posted by Bigugly

You're kidding me, right?
That's ridiculous lol
Our N55 head flows nearly identical numbers as our N54 head, and they make 650hp at 23psi, and over 800 at 30.
We run out of octane with 93 at 16-17psi, vs a stock head at 19 on a single turbo.
A stock head makes 650hp at 30psi, for reference

can you explain how a ported head would benefit and how much power would it make more on a ps2 fbo (500 whp) setup ?

let me find my convo with mmp and ill report back sorry if im wrong

[Bigugly]

i dont need to explain volume efficiency and how a (correctly) ported head benefits practically any engine, there's countless google topics you can read up on that.
But any time you help stop a bottleneck, it helps overall.

[bbnks2]

Originally Posted by Bigugly

i dont need to explain volume efficiency and how a (correctly) ported head benefits practically any engine, there's countless google topics you can read up on that.
But any time you help stop a bottleneck, it helps overall.

MMP probably meant more that with the airflow of a PS2 and the power goals that it's not exactly the best or most necessary bang for your buck option.

[biz77]

Originally Posted by Bours

it has to do with injectors in all the threads.....in my case rebuild was suppose to take 6 weeks and im at week 12.....thats my only complaint...communication and updates are lacking a bit....but if final result is great i guess ill be happy

Your experience sounds very typical. If they are deceiving people on something as simple as injectors are the expensive parts you specified and paid for (parts you cannot see) actually going in your engine?

[Bours]

Originally Posted by biz77

Your experience sounds very typical. If they are deceiving people on something as simple as injectors are the expensive parts you specified and paid for (parts you cannot see) actually going in your engine?

well you are right... i have no clue....ill ask for pictures of em installed i guess

[Xdrive35i2014]

Originally Posted by biz77

Your experience sounds very typical. If they are deceiving people on something as simple as injectors are the expensive parts you specified and paid for (parts you cannot see) actually going in your engine?

If going for a head ported job, what are some highly reputable shops? ABR, vacmotorsport?