N54 Reconditioning question

[bimmer330]

Good day fellow fanatics.

I would like to know if the N54 motor can be reconditioned?
 I suspect a broken ring land on piston 5 because it had bad blow by and I scanned her with protool and it gave me a negative value on cylinder 5.
Have anyone here reconditioned a N54 or N55 motor by replacing pistons and all the work that goes with it?
I BMW technician told me that you cannot hone these sleeves and they will use oil if done.

Advice will be appreciated.

Regards.

 

[Kish2604]

Ok so i hope this reply is not construed as abrasive as its not...

1. Protool is a disgnostic and coding tool, it cannot measure compression in an x35 motor.
2. To measure compression you need a compression tester and follow the process in the video attached

3. N54 throw a lot of blowby because of the valve cover design and your single turbo conversion would not make it any better.

Get a proper compression test done and revert...

 

[MedicN54]

Following this... as im busy re-doing my motor, I have been told it cannot be done and have been told it can be done. I firmly believe that it can be done but we will see once im done then at least my input will hold water as it will be from personal experience.

 

[bimmer330]

Ok so i hope this reply is not construed as abrasive as its not...

1. Protool is a disgnostic and coding tool, it cannot measure compression in an x35 motor.
2. To measure compression you need a compression tester and follow the process in the video attached 

3. N54 throw a lot of blowby because of the valve cover design and your single turbo conversion would not make it any better.

Get a proper compression test done and revert...

Thanks Kish.

I'm pretty sure cylinder 5 is gone.

The motor also have 270k on it.
It started smoking and it feels like its running on 5pots until the boost comes in.

Thanks.

 

[bimmer330]

So.
I did a cold compression test and got the following.
Cylinder 1 at 140psi
Cylinder 2 at 150psi
Cylinder 3 at 150psi
Cylinder 4 at 130psi
Cylinder 5 at 90psi
Cylinder 6 at 150psi.

Kish. Any suggestions?
Thanks.