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  1. #1
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    Differences between N53 and N52 in appearance

    There is a 325i here and is built in year 2007, so the engine can be either of these:

    N52B25
    N52B30
    N53B25
    N53B30

    How can i realize what engine it's got with just looking at engine?

  2. #2
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    ?!

  3. #3
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    Bump, not sure who has the answer to this.

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    N53 uses a cylinder head similar to the N54 with high precision injection, just different valvetrain & sizes. Also, N53B30 bore & stroke it similar to the the bottom end N52 valtronic w/port injection...but they added a bit more compression 12:1cr with the crown for direct injection. They also use DME MSD81.2 DME's with 2 power variations.

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    Click here to enlarge Originally Posted by m54b25 Click here to enlarge
    N53 uses a cylinder head similar to the N54 with high precision injection, just different valvetrain & sizes. Also, N53B30 bore & stroke it similar to the the bottom end N52 valtronic w/port injection...but they added a bit more compression 12:1cr with the crown for direct injection. They also use DME MSD81.2 DME's with 2 power variations.
    Great stuff, thank you.

    Is there any way to tell from the engine bay which one someone has?

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Great stuff, thank you.

    Is there any way to tell from the engine bay which one someone has?
    Just provide the last 7-vin. Also, apparently N53 was never entered in the USA market.

  7. #7
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    Click here to enlarge Originally Posted by m54b25 Click here to enlarge
    Also, apparently N53 was never entered in the USA market.
    This would explain why most of us never really pay attention to it. Sounds like a nice update though...

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    Thanks for the answer. The engine cover of N52B30 is silver while others have black engine cover, right?

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    N53 never made it to both USA and Australia due to high sulphur in fuel. They learnt this the hard way with the M60 V8 engines in the 1990s in the US market and the M52 motors with nikasil lined cylinders in some European markets.

    Strange that Australia never had any nikasil problems yet BMW Australia deemed the fuel quality here to be unsuitable for the direct injection N53 but it was ok with bringing the N54 in? Does not make sense.

  10. #10
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    Click here to enlarge Originally Posted by Leo Click here to enlarge
    N53 never made it to both USA and Australia due to high sulphur in fuel. They learnt this the hard way with the M60 V8 engines in the 1990s in the US market and the M52 motors with nikasil lined cylinders in some European markets.

    Strange that Australia never had any nikasil problems yet BMW Australia deemed the fuel quality here to be unsuitable for the direct injection N53 but it was ok with bringing the N54 in? Does not make sense.
    Interesting post.

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    last 7 in the vin.... and we will tell you...
    Click here to enlarge

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