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Thread: P/P N54 Head

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    P/P N54 Head

    I just got the call last week that my head was ready to be picked up. Very happy with the work! To save on cost I decided to take on polishing the combustion cambers which is coming along nicely. I'm not going all out and didn't see any need for over sized valves as this is a spare head.

    .003 was taken off the deck but I am pretty set on using the stock (not thick) head gasket as I don't want the quench area to be too tall and have too much of the steel gasket sealing ring exposed during combustion and retaining heat. Between DI, running E85, and losing a slight amount of CR to the polishing of the CC I think I am making the right choice as this will be a daily driver and don't want to lower my CR too much. Once I decide to add a single, my hope is that the E85 will allow for higher boost without knock.


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    flow numbers?
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    Happy new car mod day! like every different build and test thread, anxious to see results.

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    the intake doesn't look like it's been done too aggressively?.. anyone got a clean totally OEM inlet photo to compare? haha

    also interested in what it flows now.
    boop

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    it's counterproductive to mirror polish a combustion chamber.
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    So you milled it? That is going to raise the compression even if you use the stock head gasket.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    So you milled it? That is going to raise the compression even if you use the stock head gasket.
    Every so slightly .003. Can anyone tell me what the compression would be at using a standard gasket?

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    Click here to enlarge Originally Posted by Dietcoke Click here to enlarge
    it's counterproductive to mirror polish a combustion chamber.
    I would have to disagree with that.

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    Click here to enlarge Originally Posted by Vertigo Click here to enlarge
    I would have to disagree with that.
    Huge waste of time in a DI app.
    08' 135i - Cobb Custom E70, FBO, LSD, Suspension stuff... FOR SALE
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    Click here to enlarge Originally Posted by Vertigo Click here to enlarge
    Every so slightly .003. Can anyone tell me what the compression would be at using a standard gasket?
    you have to fill the combustion chamber and piston dish with water to determine your compression ratio.

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    Click here to enlarge Originally Posted by Vertigo Click here to enlarge
    I would have to disagree with that.
    +1

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    Click here to enlarge Originally Posted by mycoupe Click here to enlarge
    you have to fill the combustion chamber and piston dish with water to determine your compression ratio.
    You can just do the math to figure it out.
    Change is constant

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    Click here to enlarge Originally Posted by The Ghost Click here to enlarge
    You can just do the math to figure it out.
    Yes, however there are parts the to equation I just don't know.

    IE: Cylinder Head volume, Deck height, etc.

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    2 out of 2 members liked this post. Reputation: Yes | No
    Removing .003" on a 84.1 mm bore is a change of .422cc per cylinder. I wouldn't worry about the difference in comp ratio. BMW makes a thicker version of the N54 headgasket. It'll keep the valvetrain geometry in check.

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    Click here to enlarge Originally Posted by Dave W. Click here to enlarge
    Removing .003" on a 84.1 mm bore is a change of .422cc per cylinder. I wouldn't worry about the difference in comp ratio. BMW makes a thicker version of the N54 headgasket. It'll keep the valvetrain geometry in check.
    Someone likes math.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Someone likes math.
    Math boy; doer of math, unable to integrate with society, only functions of (x).

    ED: could be a bump of a few points of a point of compression? haha 'high' comp N54 woo!
    boop

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    It's a bump of .05 point of compression.

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    Click here to enlarge Originally Posted by Dave W. Click here to enlarge
    It's a bump of .05 point of compression.
    Keep in mind that the increase in combustion chamber volume from polishing will drop compression. Not that the difference from either will be meaningful but its probably a wash anyway.

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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    Math boy; doer of math, unable to integrate with society, only functions of (x).
    WOw, that is a REALLY obscure reference! Somehow I know it, but I don't have an iPhone. Click here to enlarge

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    Click here to enlarge Originally Posted by JC335xi Click here to enlarge
    Keep in mind that the increase in combustion chamber volume from polishing will drop compression. Not that the difference from either will be meaningful but its probably a wash anyway.
    This was my point in the very first post. It should be a wash. I also choose to stick with the OEM gasket to keep the quench area nice and tight since I shouldn't have to worry about pre-ignition or detonation with E85.

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    Click here to enlarge Originally Posted by Vertigo Click here to enlarge
    This was my point in the very first post. It should be a wash. I also choose to stick with the OEM gasket to keep the quench area nice and tight since I shouldn't have to worry about pre-ignition or detonation with E85.
    Doh! I missed that in the OP. I guess we are on the same page then. lol

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    Click here to enlarge Originally Posted by Dave W. Click here to enlarge
    WOw, that is a REALLY obscure reference! Somehow I know it, but I don't have an iPhone. Click here to enlarge
    honestly, i don't know.. I've known it for at least a decade now, used to have it on my MSN messenger tagline thing haha
    boop

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