[lwgrenier]

Originally Posted by 9krpmrx8

Yours is, but not all are cast.

Did they move to a forged in the F30 or something? Interesting that they switched from forged to cast and then back again.

[9krpmrx8]

Originally Posted by lwgrenier

Did they move to a forged in the F30 or something? Interesting that they switched from forged to cast and then back again.

11217602972
Forged Crankshaft
From:
11/01/2015
To:
-
Weight:
22.500 kg
Price:
Supersedes:
11212334334
(07/02/2012 — 08/08/2016)
Part 11217602972 was found on the following vehicles:
• 1' F20   (04/2011 — 02/2015)
• 1' F20 LCI   (06/2014 — 06/2016)
• 1' F21   (12/2011 — 02/2015)
• 1' F21 LCI   (06/2014 — 06/2016)
• 2' F22   (10/2012 — 06/2016)
• 2' F87 M2   (11/2014 — 06/2017)
• 2' F87 M2 LCI   (09/2016 — 06/2018)
• 2' F23   (03/2014 — 06/2016)
• 7' F02 LCI   (05/2011 — 05/2015)
• X4 F26   (11/2014 — 03/2018)
• MS BMW Motorsport   ( — )

[Ozzie335i]

Originally Posted by 9krpmrx8

Bruh, noobs got theories and shit.

Pladi's theory is no less valid than either yours or bbnks'. As one that has recently purchased new rod bearings I can attest they are the same as used as replacements for the N54, among several other engines. So if ever so slight expansion is causing oil flow issues Pladi may be right.

[lwgrenier]

Originally Posted by Ozzie335i

Pladi's theory is no less valid than either yours or bbnks'. As one that has recently purchased new rod bearings I can attest they are the same as used as replacements for the N54, among several other engines. So if ever so slight expansion is causing oil flow issues Pladi may be right.

Ours are cast though, so thermal expansion would most likely be less. Durability is what I'd be concerned about.

[9krpmrx8]

Originally Posted by Ozzie335i

Pladi's theory is no less valid than either yours or bbnks'. As one that has recently purchased new rod bearings I can attest they are the same as used as replacements for the N54, among several other engines. So if ever so slight expansion is causing oil flow issues Pladi may be right.

Yes, anyone came come up with a theory, even if they have never built an engine, made custom turbo kit, or done any serious mechanic work, etc. in their life.

[Pladi]

Originally Posted by 9krpmrx8

Yes, anyone came come up with a theory, even if they have never built an engine, made custom turbo kit, or done any serious mechanic work, etc. in their life.

i have built a MZR block from ground up. It doesnt make me an expert or anyone on metallurgy or metal expansion.. especially when there is no data..

Its just a theory.. all we have had is theories. Whats wrong with that.

[Ozzie335i]

Originally Posted by lwgrenier

Ours are cast though, so thermal expansion would most likely be less. Durability is what I'd be concerned about.

True dat. I was just trying to defend Pladi as he has good input. As far as the crank breaking, I am at 530 + @ the wheels on e50. There are some running 100% e85 out there probably making 570 or so. No reports of dropped cranks. So far.

[Pladi]

Originally Posted by Ozzie335i

True dat. I was just trying to defend Pladi as he has good input. As far as the crank breaking, I am at 530 + @ the wheels on e50. There are some running 100% e85 out there probably making 570 or so. No reports of dropped cranks. So far.

cant believe that ozzie you are taking my side hahahha

But on a serious note its unsettling that our years might be more prone to failure regardless of why. Are you gonna entertain us with pictures when you do yours ? (rod bearing swap)

[lwgrenier]

Originally Posted by Ozzie335i

True dat. I was just trying to defend Pladi as he has good input. As far as the crank breaking, I am at 530 + @ the wheels on e50. There are some running 100% e85 out there probably making 570 or so. No reports of dropped cranks. So far.

Yeah I agree, I don’t think it’s an issue with the crank. Just think it’s strange that ours aren’t forged

[Pladi]

Originally Posted by lwgrenier

Yeah I agree, I don’t think it’s an issue with the crank. Just think it’s strange that ours aren’t forged

so did you decide to keep the car ? lol

[Ozzie335i]

My mechanic said he'd have me there during the critical time. Presumably to spread the blame when things go wrong, eh. We're all rightly pretty emotional over this. We've spent a lot of money and / or time on these rides. Mine is my play car that I intend on driving it until I croak, or it kills me. I could have had a stang, camaro or vette. I hate them all. The ride, the lack of visibility, where you are parked by the valet at nice restaurants. Long live my 2011 coupe, even if I need to change the engine out after 50 k more miles.

[lwgrenier]

Originally Posted by Pladi

so did you decide to keep the car ? lol

No sold it to a friend of the guy who replaced my engine. That way I wouldn't feel guilty if anything went wrong.

My life has been significantly less stressful since getting rid of it haha.

[bbnks2]

Originally Posted by Ozzie335i

Pladi's theory is no less valid than either yours or bbnks'. As one that has recently purchased new rod bearings I can attest they are the same as used as replacements for the N54, among several other engines. So if ever so slight expansion is causing oil flow issues Pladi may be right.

What? Theory? It's not a theory. The cast crank has 0 relevance to rod bearing failure. I am not just pulling that out of my ass. Please google the word "empirical." I am talking from a standpoint of having seen actual pictures and first hand experience not theory. You don't have crank issues without it leaving evidence behind on the main bearings.

Expansion? Where do you see ANY indication that this is an issue? As already stated, a cast crank would EXPAND LESS meaning BETTER oiling consistency. The complete opposite of what you guys are trying to infer. Not to mention BMW cranks get heat treated (Nitride).

Also, not all F-series got a forged crank. If you actually click the links for the cars the parts are found in you'll find that only the "M" cars got the forged crank M135i, M235i, M40i, 740li, etc... People with 2011's trying so hard to convince them-self that there is something wrong with 2011's meanwhile the cars posted up have been produced anywhere from 2010 to 2018 even and from multiple different manufacturing locations.

https://f30.bimmerpost.com/forums/sh...1587743&page=2

[lwgrenier]

Originally Posted by bbnks2

What?Expansion? wtf are you guys talking about. As already stated, a cast crank would EXPAND LESS meaning BETTER oiling consistency. The complete opposite of what you guys are trying to infer. Not to mention both cranks get heat treated.

I don't think anyone was implying a cast crank would expand more, because that's not true. I was just saying a forged crank is less likely to deform due to stress.

[bbnks2]

Originally Posted by lwgrenier

I don't think anyone was implying a cast crank would expand more, because that's not true. I was just saying a forged crank is less likely to deform due to stress.

I don't disagree with that at all but we aren't talking about 700whp+ builds. There has been 0 indication of any kind of crank inconsistency-- "change my mind."

[Pladi]

Originally Posted by lwgrenier

No sold it to a friend of the guy who replaced my engine. That way I wouldn't feel guilty if anything went wrong.

My life has been significantly less stressful since getting rid of it haha.

Yeah dont blame her. Now u can watch us get emotionally invested from a distance lol. Shoot eachother down with all the scientific data.