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Old Mon, Apr-15-2019, 04:15:06 AM   #121
bimmerdriver
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Default Re: The ENGINE Thread

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Everything he said applies to V12 engines also. The root note is straight-forward for an even firing engine, but it's more complicated for an engine that isn't even firing. Whether the crankshaft is cross plane or flat-plane also has an effect on the root note.
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Old Sun, Apr-21-2019, 02:03:50 PM   #122
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Default Re: The ENGINE Thread







https://jalopnik.com/bmw-engines-are...hit-1784684330
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Old Sun, Apr-21-2019, 03:53:37 PM   #123
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Default Re: The ENGINE Thread

Lol. Some truth in there.
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Old Sun, Apr-21-2019, 04:11:00 PM   #124
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Default Re: The ENGINE Thread

I never had any issues with my M3 or M5 or X5 M.

Oh wait. Never mind. All 3 left me stranded and two needed new engines (I was able to limp the X5 to the dealer). All due to mfg defects (poor quality control) - bad iron block casting on the S54 (ded at 40k miles, 2005 build), bad fuel injector batch on S85 (deaded at 60ish miles if I remember right). X5 M needed new injectors around 40k miles.

Yet I still contemplate getting an X3 M
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Old Sun, Apr-21-2019, 04:44:31 PM   #125
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Default Re: The ENGINE Thread

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The E46 M3 radiator doesn't belong in that article. Rod bearings weren't an issue beyond those engines affected by the recall. CCV failures and hard starting are also suspect. The E46 M3's biggest issues by far were the intake cam gear bolts, VANOS hub on the exhaust cam, and rear subframe mounting areas.

That aside, it is interesting how many M engines have some unique issue that leads to engine failure, usually just after the standard warranty period.
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Old Sun, Apr-21-2019, 06:28:33 PM   #126
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Default Re: The ENGINE Thread

^ Doesn't the s54 require rod bearing replacement at about 100k miles?

The article is definitely click bait, but these engines do have issues.

Last edited by e46Dawg; Sun, Apr-21-2019 at 07:21:19 PM.
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Old Sun, Apr-21-2019, 07:43:04 PM   #127
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Default Re: The ENGINE Thread

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^ Doesn't the s54 require rod bearing replacement at about 100k miles?
The bearings in the DIY on this site were changed at 130k miles and still looked pretty good. Depends on where you subjectively want to draw the line, but I don't consider +100k miles on rod bearings in an 8000 rpm engine to be on the same level as E92 rod bearings, or congruent with the point the article is making. The E46 bearing clearance itself is acceptable as I understand it, whereas the E92 and E60 is tighter than traditional rule-of-thumb for bearing clearance as a function of crank journal diameter.

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The article is definitely click bait, but these engines do have issues.
Certainly, but some of those things (e.g. E46 M3 radiator) simply don't belong.
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Old Sun, Apr-21-2019, 09:24:07 PM   #128
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Default Re: The ENGINE Thread

Agreed that there is a difference between having to change rod bearings at 100k+ miles and having them flat out fail at low mileage. Also agreed on the e46 radiator. BMW cooling systems could be a completely separate rant.

It is funny though when you start thinking about all these engines and their unique problems.
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Old Sun, Apr-21-2019, 09:33:07 PM   #129
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Default Re: The ENGINE Thread

Yeah, the E46 M3 really doesn't deserve a bad reputation for its cooling system. It's inheriting that reputation from the non-M -- people assume the M will automatically be more prone to failure.

No argument on VANOS or subframe/racp though. BMW dropped the ball there.
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Old Sun, Apr-21-2019, 10:06:29 PM   #130
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Default Re: The ENGINE Thread

Lolíd a bit at that article. A few good points buried in such hyperbole that I think the author is doing himself a disservice (granted: clickbait).

Iím sure one of these could be written about any performance car manufacturer (except maybe Honda back in the day?)


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Discussing The ENGINE Thread in the Off Topic Forum - Place to discuss this and that. Note: We also have "request to join" forums: Guns and Fitness.
(Threads/posts inside may contain material that is NSFW / offensive) at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)