UPDATE: S65 with a custom hole in block

[///M Power-Belgium]

Originally Posted by gama7453

And that one my friends is the response of a gentleman

Thank you , I really appreciate it .

[///M Power-Belgium]

Originally Posted by Shredicus

Is there a company selling kits for these custom holes, or is this something I'd need to get done professionally? Could I request a bigger hole than the one in OP? Just want to make sure I'm getting max airflow to my bearings.

To get more induction noise ?

[VCP]

Big end was free on crank and no unusual wear on bearing. The rod did not shear laterally, which is what happens when they seize to crank, it sheared horizontally. So one of 2 things. Detonation, or imperfection in these horrible rods and piston(s) do not show any signs of detonation. To clarify, this motor has 24,000 km on it with oil service every 5k km.

Originally Posted by regular guy

Rod big end blue again. I usually attribute that to clearance, which leads to bearing wear, which leads to bearing failure, which leads to excessive heat, which leads to boom!

Was the rod or cap welded to the crank? I'm still trying to see if I can use that crank, and the picture of the journal has me a bit worried because of what looks like the scratches on it, and the blue rod big end that went along with it.

[BPMSport]

Wow... that's 15,000 miles.. unbelievable..

But then again, stock ones have blown with under 10.. which is really disheartening.

[VCP]

It sure is Mike

Originally Posted by Mike Benvo

Wow... that's 15,000 miles.. unbelievable..

But then again, stock ones have blown with under 10.. which is really disheartening.

[Ging]

More photos

The main oil galley took a bad hit from the rod and the starter even got a hit.

[aus]

So we're still not sure what happened here?
Sorry to see this mess OP. Good luck.
.

[WhatsADSM]

Anything in the cylinder? Like it sucked something up or dropped ceramic from a plug or something?

[Ging]

So far seems that the rod itself fail structurally. Maybe a defect in the rod but still slowly pulling it apart. nothing in the cylinder and no running problems. The block will make a nice coffee table in the end

[s85e90]

Originally Posted by pbonsalb

Is detonation the only way a rod can fail? What signs of detonation do you see as opposed to bearing failure? We need to see the piston and the bearing. There are far more failures attributed to bearings than detonation for these motors.

I couldn't care less or to go into it more as it was brought up in another thread and dismissed as me being wrong, but there's not reason to not think detonation is a big contributor to these motors failing. Detonation will put excessive forces on the top of the piston and force the little oil that is between the bearing surfaces outward and show accelerated wear to the upper bearing shells as has been evidenced many, many times. The fact that audible knocking can and has been heard on many vehicles leads me to believe that the advanced knock system BMW uses isn't as good as a standard knock detector.

[s85e90]

Originally Posted by kawasaki00

Technical answer, when more than 10-15% of firing cycles result in peak cylinder pressure before the crankshaft reaches 4 degrees ATDC in any given timed period.

Or you could have just said pre-ignition.

[8k3]

how much boost was this running when it destructed itself?

[regular guy]

Originally Posted by s85e90

Or you could have just said pre-ignition.

So you wanted him to answer this:
Please don't shoot.........can someone define "detonation"?

...with pre-ignition?

Got to admit, this is rather annoying. He's one of the guys who contributes to the forum and shouldn't have his balls busted for answering the guy's question as he saw fit.

[s85e90]

Originally Posted by regular guy

So you wanted him to answer this:
Please don't shoot.........can someone define "detonation"?

...with pre-ignition?

Got to admit, this is rather annoying. He's one of the guys who contributes to the forum and shouldn't have his balls busted for answering the guy's question as he saw fit.

The point was to be simplified as most here don't even change their own oil. Wasn't busting balls but giving a simpler answer.

[aussiem3]

So much for this engine was built at Landshut alongside BMW F1 engine at the time, and all the marketing bull$hit that went on. The more you see these failures and the variances of them, there has been a fundamental design failure. I am sure BMW picked this up in the S85, hence the slight modified design for S65.

The best part is reputable tuners like Hamann, ACS, G-Force - all German-based, have not touched on the bearing, and any issues relating to them. Don't know why?

Sure these guys beat the $shit out of these cars during R&D, and they haven't picked up there is a bearing or other oil related issue? It will be interesting to know what oil these guys are running. That may provide some insight, and help the wider community. I don't if anyone has asked this question before. I may be wrong.

[Ging]

about 7.5 psi

Originally Posted by 8k3

how much boost was this running when it destructed itself?

[Ging]

UPDATE

Found the reason for the hole..... the rod itself close to the small end fractured and things got messy. Heres the photos

The bank with the rod failure



The other bank



The Failed small end with piston. You can see the fracture at the top of the rod. The damage on the left side of the piston is from the web of the crank hit it and the right side is where it bottom out in the cylinder bore.



The reason the piston cracked is after the rod fracture the small rod end was rotated up it to the piston. The tapered design of the small end acted as a wedge and spilt the piston like a log. Small end was jammed in the piston until we removed it from the bore. Still moved freely on the wrist pin after unjamming it from the piston wall.



Damage to other cylinder wall from failed rod



Rod journal of failed rod. In really good shape so as said before not a rod bearing failure and both rods moved freely on journal.



Failed rod cylinder you can see where the piston bottom out in the bore

[apecush]

Sweet fatigue crack!

[bigjae1976]

Is this one of the first S65s to fail like this? If I didn't know any better, I'd guess with this was an M54B30 with their weak ass rods.

[Ging]

Could be the first documented one. who knows ...

Originally Posted by bigjae1976

Is this one of the first S65s to fail like this? If I didn't know any better, I'd guess with this was an M54B30 with their weak ass rods.

[VCP]

Weak ass rods and bolts indeed

Originally Posted by bigjae1976

Is this one of the first S65s to fail like this? If I didn't know any better, I'd guess with this was an M54B30 with their weak ass rods.

[VCP]

I value your thoughts on these pics bud. Can we get you anymore photos or info that you could use?

Originally Posted by regular guy

So you wanted him to answer this:
Please don't shoot.........can someone define "detonation"?

...with pre-ignition?

Got to admit, this is rather annoying. He's one of the guys who contributes to the forum and shouldn't have his balls busted for answering the guy's question as he saw fit.