THE M3 IS GETTING THE ANRI BUILD TREATMENT - Blown headgasket to build thread

[Anri]

Hi ANRI, in your experience, is there an actual benefit to coat the bearings?

I was thinking something like yours, or micro blue. Would you offer this service? I have a RB set for my car.

I get the same question over and over from customers and I always ask
to understand the difference between Surface Treatment WPC vs
coating ! these are 2 different things.

Many benefits from every angle (too long to explain) If there was not
an actual benefts JE, CP, Weisco list goes on and on, none would offer this
dry film as an option everyone would offer surface treatment...

Yes I offer the RB service for $300 much better option than wpc.

Regards,
Anri

[sapote]

Note the factory lines on the skirt are like New...

Anri,
The piston looks absolutely like new with no sign of wear. How many miles on these pistons?
What contribute to the low wear -- tight clearance to minimize piston slapping or piston outer surface texture design to retain oil?

[Anri]

Anri,
The piston looks absolutely like new with no sign of wear. How many miles on these pistons?
What contribute to the low wear -- tight clearance to minimize piston slapping or piston outer surface texture design to retain oil?

Sapote,

I think we went thru this in the previous S54.

But again few things are involved in this, its crazy
how much at "suppose" shitty rod ratio and F1 level
of piston speed etc all negative but facts speaks for it
self when its calculated right its not a problem.
Of course for example 1.74 rod ratio is better but
nothing wrong with existing 1.52 rod ratio. On top of
that the side skirt design is low profile in order to reduce
the piston weight and friction this is all negative...when
the rod ratio is in low number.

- BMW calculated the expansion rates very well.
- Slipper skirt from the factory to retain oil and reduce friction
(same dry film as the one I have done in the pic)
- Larger more aggressive groves (we spoke on this subject previously) to retain oil
- At last is the tune, the Factory tune is absolutely the best
in order to save the engine from detonation and other problems.

This engine has some minor pistons slap on a cold start
~30F which is normal but more important is it goes away after
around 2mins max.

My measurements shows that the piston to wall clearance
is on the lose side or max in spec. Tight is never good because
the target piston to wall is when the engine is at track at say 110C
on abuse or even let say in hot summer time. On S54s
with bad fan clutch during summer time with AC on in
traffic I have seen 108-110C were the needle will pass the
center this is were the piston will get scuffed mostly on the
exhaust side skirt due to growing excessively and will push the
oil away and will get tight to the wall.
This engine has I think 155k miles and I am sure it has seen
this hi temp conditions more than 1 time due to the bad head
gasket failure, indeed.


Regards,
Anri

[ChapterM3]

Anri,
The piston looks absolutely like new with no sign of wear. How many miles on these pistons?
What contribute to the low wear -- tight clearance to minimize piston slapping or piston outer surface texture design to retain oil?

I was pretty shocked to see how well they've held up since 2004 and with 155,505 miles on them - as far as I'm aware the motor has never been opened up and the pistons have never been out. Only thing done in that area was rod bearings about 25k ago and that was it.

[Anri]

Moving to the rod, bearings, bolts.

In S54 industry is a Fashion to use ARP rod bolts rather than looking at how it works.

ARP Manufactures great products.

Any of those who install ARP are aware of that if one is using different bolt
design the connecting rod Must be re-sized ? In the Instructional sheet row # 7
ARP politely says "Should always be re-sized", its worded very clever and R@R
options do love to load up the bill with parts and the Motor "it better than factory"
is the go.

Jonathan you paid money to have your freshly 20k miles bearing/s shown in the pic
look like they are 150k miles and you are not even tracking this car...if it was tracked...
then for sure the rod knock...

The evidence shows the bolt were placed without using ARP hi torque moly grease
it is also important how the bolts is torqued.

In the picture bellow pay attention on the rod side, the bearing has darker spots means
increased tension.

Moving forward.

Regards,
Anri

[sapote]

Anri,
So the ARP bolts have less stretch lengthwise under the same torque spec, and this caused the bearing clearance to be less than spec?

[Anri]

Anri,
So the ARP bolts have less stress lengthwise under the same torque spec, and this caused the bearing clearance to be less than spec?

Sapote,

When the factory rods were made they were machined with the
factory specific bolts and specific clash is achieved with this bolt
design.

When one replaces the bolts with other than intended one
then the side Clash changes and it tights up the oil clearance
because the 2mm bearing shell takes the shape of the BE

It also matters how you torque the bolts...

Again, ARP at row # 7 politely saying "should be re-seized"

Can you imagine if you bring me your M3 and ask me Anri can you
replace my rod bolts with ARP and I answer you back it will cost
you $15k because I have to take the engine apart....

Clear?

Regards,
Anri

[Anri]

Pistons skirts are all dressed in Moly so do
the ACL bearings.

Moving forward.

[ZiMMie]

Moving to the rod, bearings, bolts.

In S54 industry is a Fashion to use ARP rod bolts rather than looking at how it works.

ARP Manufactures great products.

Any of those who install ARP are aware of that if one is using different bolt
design the connecting rod Must be re-sized ? In the Instructional sheet row Special
ARP politely says "Should always be re-sized", its worded very clever and R@R
options do love to load up the bill with parts and the Motor "it better than factory"
is the go.

Jonathan you paid money to have your freshly 20k miles bearing/s shown in the pic
look like they are 150k miles and you are not even tracking this car...if it was tracked...
then for sure the rod knock...

The evidence shows the bolt were placed without using ARP hi torque moly grease
it is also important how the bolts is torqued.

In the picture bellow pay attention on the rod side, the bearing has darker spots means
increased tension.

Moving forward.

Regards,
Anri

can you post a picture of all the removed rod bearings?

[bimmerfan08]

Sapote,

When the factory rods were made they were machined with the
factory specific bolts and specific clash is achieved with this bolt
design.

When one replaces the bolts with other than intended one
then the side Clash changes and it tights up the oil clearance
because the 2mm bearing shell takes the shape of the BE

It also matters how you torque the bolts...

Again, ARP at row # 7 politely saying "should be re-seized"

Can you imagine if you bring me your M3 and ask me Anri can you
replace my rod bolts with ARP and I answer you back it will cost
you $15k because I have to take the engine apart....

Clear?

Regards,
Anri

Hi, Anri. Would like to explore this comment a bit further.

My understanding is that early connecting rods (with the M11 bolt variant) were matched individually to connecting rod bolts. The later bolts (M10 variant) are not rod-exclusive given their TTY design, IIRC. Does your comment only apply to rods with M11 bolts or is it across the board for all S54 connecting rods?

[Anri]

can you post a picture of all the removed rod bearings?

Earlier today I was able to pull few from the trash and
they all looked the same. Note the dark side is all even
which I not good and the next stage is like the worst one.

Remember these bearings have only 20k miles on them.

[Anri]

Hi, Anri. Would like to explore this comment a bit further.

My understanding is that early connecting rods (with the M11 bolt variant) were matched individually to connecting rod bolts. The later bolts (M10 variant) are not rod-exclusive given their TTY design, IIRC. Does your comment only apply to rods with M11 bolts or is it across the board for all S54 connecting rods?

Hi,

I have single point. M9 M10 M11 M12 M13 list goes
if the rod is machined with specific Rod bolt keep it
with that rod bolt design new or re-use the old one.

If the rods are out on the table then it does not matter
which one you chose because they will be re-sized given
your bolts choice.

Regards,
Anri

[Slideways]

Hi, Anri. Would like to explore this comment a bit further.

My understanding is that early connecting rods (with the M11 bolt variant) were matched individually to connecting rod bolts. The later bolts (M10 variant) are not rod-exclusive given their TTY design, IIRC. Does your comment only apply to rods with M11 bolts or is it across the board for all S54 connecting rods?

kaiv might be able to give some insight on the early rod and APR M11 combo using the stretch method. By now, he could have done a third or fourth bearing replacement on a track car and reused the APR M11s.

Lang in SoCal was the only one who posted the early rod bore measurements using that combo and that got lost with the old forum.

[Anri]

kaiv might be able to give some insight on the early rod and APR M11 combo using the stretch method. By now, he could have done a third or fourth bearing replacement on a track car and reused the APR M11s.

Lang in SoCal was the only one who posted the early rod bore measurements using that combo and that got lost with the old forum.

Slideways,

Nothing new under the sun. It's standard measurement
during engine building. I did it with this current set up as
well and found interesting data..

I believe you are missing major point here.

[George Hill]

My understanding is that early connecting rods (with the M11 bolt variant) were matched individually to connecting rod bolts.

Just an FYI, BMW published information saying the early M11 bolts were hole specific in regards to the connecting rod location. When I was at the dealer back in 2012 or so I was chatting with an engineer about this and he said that it was NOT necessary and BMW published that in hopes that it would lead to potentially less technician at fault failures during the RB recall.