Official S65 Rod Bearing Condition Example Thread

[m3s65b4.x]

When new oe rods big end sizes tends to be smallest possible 2.2047 (wiki 2.20480 - 2.20540 inch) which are common actual crank journal sizes?
Are you folks trying to measure them when doing RB's if that possible at all w/micrometer?
Not optimal method but 1-2 measures per journal still better than nothing.

Do you forum members use BE STD bearings or +0.001 clearance?
BE list std bearings and +0.001's seems to be per ask

Originally Posted by Green-Eggs

Crank journal: 2.04640 - 2.04680
Rod big-end bore: 2.20470 - 2.20520
Shell thickness: 0.07825 - 0.07875

Industry standard best practices would want 0.0024 inch. (clearance)

..every brand new factory rod we've ever measured was exactly 2.2047 on the big end.


https://www.m3post.com/forums/showthread.php?t=892838

[jvictormp]

Originally Posted by m3s65b4.x

When new oe rods big end sizes tends to be smallest possible 2.2047 (wiki 2.20480 - 2.20540 inch) which are common actual crank journal sizes?
Are you folks trying to measure them when doing RB's if that possible at all w/micrometer?
Not optimal method but 1-2 measures per journal still better than nothing.

Do you forum members use BE STD bearings or +0.001 clearance?
BE list std bearings and +0.001's seems to be per ask

STD bearings are for std crank. And they already have the clearance problem solved.

The other bearings are for re-machined crank.

[Green-Eggs]

Originally Posted by m3s65b4.x

When new oe rods big end sizes tends to be smallest possible 2.2047 (wiki 2.20480 - 2.20540 inch) which are common actual crank journal sizes?
Are you folks trying to measure them when doing RB's if that possible at all w/micrometer?
Not optimal method but 1-2 measures per journal still better than nothing.

Do you forum members use BE STD bearings or +0.001 clearance?
BE list std bearings and +0.001's seems to be per ask

Originally Posted by jvictormp

STD bearings are for std crank. And they already have the clearance problem solved.

The other bearings are for re-machined crank.

It's a little more complicated than that...because 95% of all sets sold will be a hand-picked mixture of STD and 0.025 shells. A separate SKU exists on the web site for 0.025 shells for engine builders that are targeting special situations and special clearances. Remachined cranks usually require 0.25mm shells, not 0.025mm shells.

[huntsgk12]

2008 e93 m3 81k miles.

View post on imgur.com

these look surprisingly good, five owner car, I can't tell if they've been replaced as there isn't any records of that.

[UFTW]

2010 E90 BMW M3 77k miles

Went with the VAC/ARP combo to replace the stock parts

[IamFODI]

Originally Posted by huntsgk12

2008 e93 m3 81k miles.

View post on imgur.com

these look surprisingly good, five owner car, I can't tell if they've been replaced as there isn't any records of that.

Those sure look like 702/703 bearings to me. Do you still have them? If so, you can check the markings on them.

If they are, they did not come with the car, so either the engine or the rod bearings were replaced some time after 2010.

[DrFerry]

Originally Posted by UFTW

2010 E90 BMW M3 77k miles. Went with the VAC/ARP combo to replace the stock parts

Something's odd IMO with some of those shells. Cyl 1 bottom shell has deep pitting marks. Cyl 8 top has deep central scoring, as do some of the others. Did you find metal shavings in the oil filter? Curios why you went with VAC instead of the BE/ARP gold standard?
.

[valve float]

Just picked up an E90
These were handed to me by PO
Done at 92,xxxkm at RPM Motorworks on ON
Now at 125,xxxkm
PO had car from 70K Km
PO used 10w60 twinpower with ceratec every 5-7K km
PO documented sipping on 1L between most OCI (car not driver)

Sunny day pix
In no particular order

uniformly knackered i'd say

[Assimilator1]

Originally Posted by IamFODI

Those sure look like 702/703 bearings to me. Do you still have them? If so, you can check the markings on them.

If they are, they did not come with the car, so either the engine or the rod bearings were replaced some time after 2010.

Just what I was thinking, they certainly look like the later alu bearings.

Originally Posted by valve float

Just picked up an E90
These were handed to me by PO
Done at 92,xxxkm at RPM Motorworks on ON
Now at 125,xxxkm
PO had car from 70K Km
PO used 10w60 twinpower with ceratec every 5-7K km
PO documented sipping on 1L between most OCI (car not driver)

Sunny day pix
In no particular order

uniformly knackered i'd say

Pretty rough as bearings go, but for the S65 lead/copper ones, relatively, they are not terrible, e.g no copper showing (that I can see anyway). Mine were showing copper, and 2 had purple heat streaks!
PS nice one for the good quality photos (taken in sunlight?)

[jvictormp]

Originally Posted by valve float

Just picked up an E90
These were handed to me by PO
Done at 92,xxxkm at RPM Motorworks on ON
Now at 125,xxxkm
PO had car from 70K Km
PO used 10w60 twinpower with ceratec every 5-7K km
PO documented sipping on 1L between most OCI (car not driver)

Sunny day pix
In no particular order

uniformly knackered i'd say

Just to make sure I understood.

These bearings of the picture are OEM (after one replacement), and have got 33k km on them. And they have never seen oil without ceratec.

That picture is the second time bearings are extracted from that engine.

Is that right?

[Assimilator1]

That's not how I read it, I thought he said the bearings were changed (once) at 92k km (~57k miles). So the OEM bearings had done 92k km. The photos are of the same bearings.
He's now got the car with 125k km on the clock.

[turbotko]

Just picked up a alpine white on fox E92 to keep my white on fox E90 company. After seeing some of these bearings in this post I don’t feel so bad about the ones that came out of the E92 now. I’ve been a BMW master tech for 20 years now so of course did them myself. Put BE bearings and bolts back.

2008, 135k miles, no idea how many owners but I would imagine most of them didn’t warm it up before driving ��. I bought with full Gintani catless midpipe and axle back exhaust, KW DDC coil overs, carbon hood and trunk lid and a bunch of other mods that are on the more expensive side of the offerings so obviously it was owned and modded by someone who didn’t cheap out. Anyway to the bearings…these are the tops.

Strangely this is the first set I’ve done with the top bearings looking pretty ragged and the bottom bearings not so bad. It’s been bugging me these last few days but all I can come with is possibly it had a blower on it at some point

[turbotko]

And here’s the bottom bearings

[turbotko]

Oh, and BTW PM me if anyone is interested in a Gintani catless dual resonator midpipe and axle back setup. Can’t tell if it’s the race or sport axle back but it shakes pictures in my house during warm up😁. It truly sounds incredible but the the neighbors DO NOT like the 10 minute warm up every morning 😂.

I know this isn’t the for sale section I’ll probably list it there one of these days also.

[Davisca455]

Originally Posted by turbotko

Strangely this is the first set I've done with the top bearings looking pretty ragged and the bottom bearings not so bad. It's been bugging me these last few days but all I can come with is possibly it had a blower on it at some point

All of the top bearings out of my car looked worse than the bottoms, which made sense to me.

In my mind I picture the top bearing having to deal with the explosion on the power stroke, while all the bottom bearing has to do is keep the piston from smacking the cylinder head.


Top on the left.

[jvictormp]

Originally Posted by turbotko

Oh, and BTW PM me if anyone is interested in a Gintani catless dual resonator midpipe and axle back setup. Can’t tell if it’s the race or sport axle back but it shakes pictures in my house during warm up��. It truly sounds incredible but the the neighbors DO NOT like the 10 minute warm up every morning ��.

I know this isn’t the for sale section I’ll probably list it there one of these days also.

if you're full catless and love the exhaust, just remove cold start cycle.

[turbotko]

Originally Posted by Davisca455

All of the top bearings out of my car looked worse than the bottoms, which made sense to me.

In my mind I picture the top bearing having to deal with the explosion on the power stroke, while all the bottom bearing has to do is keep the piston from smacking the cylinder head.


Top on the left.

Oh yikes ok lol…those bearings aren’t exactly pretty are they. Agreed the top bearing takes the power stroke it’s just the other four S65’s I’ve done bearings on had equal wear top and bottom. Granted this is the first non LCI S65 I’ve done so maybe normal idk. Being a BMW tech at a dealer we actually don’t see too many S65’s period and I’ve only ever done one customer car which got pulled completely down, everything measured and documented then reassembled.

As far as the Gintani goes I really do like the way it sounds especially if I was still in my 20’s, but can’t live with it everyday, just not my style. My E90 is completely stock exhaust with muffler mod and it’s perfect for me. I think many people don’t realize a lot of the pretty noises the S65 makes comes from under the hood 👍🏼

[turbotko]

I can add one other interesting thing to this thread. My 2010 E90 had WPC coated bearings and ARP bolts put in it 50-60K miles ago before I owned it. Of course the first thing I did was do them again myself with BE stuff but have pics of what WPC coated bearings look like after 50k miles. I know the previous owner of my E90 and was the only tech allowed to work on it for the 5-6 years he owned it. I know he maintained it religiously including oil analysis (he insisted) and drove the car mildly. It always got the BMW 10-60W oil and filter done by me every 7500 miles.

[lauz]

Uftw post, i would like to know also the reason of thoses verticales lines as, itssimilar to mine who spun a bearing…

[valve float]

Originally Posted by Assimilator1

That's not how I read it, I thought he said the bearings were changed (once) at 92k km (~57k miles). So the OEM bearings had done 92k km. The photos are of the same bearings.
He's now got the car with 125k km on the clock.

Correct … sorry I write in point form (from nurse that charts++)…Stbxw hates it, thinks I’m pissed all the time

[turbotko]

Originally Posted by lauz

Uftw post, i would like to know also the reason of thoses verticales lines as, itssimilar to mine who spun a bearing…

That picture makes me cringe 😬. When I first bought the E90 I took it out on the second day and used launch mode cuz…well it’s there right lol. 4-5 gears to redline later and it didn’t sound the same at all back at idle. I figure oh no no no spun a bearing already wonderful. I almost cried tears of joy when I saw the completely broken motor mounts on it causing all the odd noise!!!

[DrFerry]

Originally Posted by lauz

Uftw post, i would like to know also the reason of thoses verticales lines as, itssimilar to mine who spun a bearing…

You win the prize for the most horrific bearing presentation..
.