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      02-25-2013, 08:17 AM   #1
xyz100
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N20 all aluminum block

I just realized that N20 does not have steel sleeves at all in the cylinders. It has steel coating instead - "electric arc spraying technology". Hopefully it does not turn into Chevy-like failure over time. Makes me wonder why they do not offer extended warranty over 100K miles.
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      02-25-2013, 10:15 AM   #2
Bill B.
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Originally Posted by xyz100 View Post
I just realized that N20 does not have steel sleeves at all in the cylinders. It has steel coating instead - "electric arc spraying technology". Hopefully it does not turn into Chevy-like failure over time. Makes me wonder why they do not offer extended warranty over 100K miles.
Only time will tell. Mercedes is in the same boat with the coated cylinders.
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      02-25-2013, 10:59 AM   #3
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Here is some discussion regarding N20 where 4.5 Year / 55000 mi is mentioned as the reliability threshold.

http://www.bimmerfest.com/forums/sho...d.php?t=643442

Not sure where they got this data though.
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      02-25-2013, 11:57 AM   #4
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Quote:
Originally Posted by xyz100 View Post
Here is some discussion regarding N20 where 4.5 Year / 55000 mi is mentioned as the reliability threshold.

http://www.bimmerfest.com/forums/sho...d.php?t=643442

Not sure where they got this data though.
Uhm... the information presented seems a little tinfoil hat-like. While planned obsolescence is a standard engineering practice, it is highly unlikely that BMW is going to design for failure at that threshold.

My guess is that they are having enough trouble keeping up with emissions and economy standards in their designs to both meet them and planned obsolescence to such a high degree.
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      02-25-2013, 02:04 PM   #5
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Here is the description of the coating technology used by MB. Which is likely the same for N20 engine.
http://www.azom.com/news.aspx?newsID=30457
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      02-25-2013, 03:30 PM   #6
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Quote:
Originally Posted by Bill B. View Post
Uhm... the information presented seems a little tinfoil hat-like. While planned obsolescence is a standard engineering practice, it is highly unlikely that BMW is going to design for failure at that threshold.

My guess is that they are having enough trouble keeping up with emissions and economy standards in their designs to both meet them and planned obsolescence to such a high degree.
Agree. I think BMW still has a 100k powertrain warranty in their CPO program (I just had a warranty repair done on a 93k X3, so at least they had it when I bought that car!) so it would make no sense for them to design the engine block to be trashed at 55k.
According to the article on MB linked above they have been using this tech since 2005. I think every car company is pushing to reduce weight and manufacturing complexity wherever possible.

They do make mistakes (google "BMW Nikasil") but I dont think they are intentionally designing things to fail.
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