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  1. #251
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    3 out of 3 members liked this post. Yes Reputation No
    Here are the charts. I don't feel like typing an explanation for each one, so if you want to know what it means you can read up online Click here to enlarge

    Basics are, for the piston orders, you want lower amplitudes. The second order is what causes the nastiness and as you can see S54b32 and M54b30 are closely matched. Acceleration is key to look at, you want to minimise the piston at TDC decelerating and then accelerating again creating that little concave bump. The curve like the M54b25 has a more ideal shape with the flat plateau.

    Just because an engine is not ideal does not mean its crap, you just have to work with it a little more and consider what you can do to reduce the issues. As mentioned earlier in the thread getting a damper tuned for higher frequencies is a great place to start Click here to enlarge

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  2. #252
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    Click here to enlarge Originally Posted by Wazzu70 Click here to enlarge
    Here are the charts. I don't feel like typing an explanation for each one, so if you want to know what it means you can read up online Click here to enlarge

    Basics are, for the piston orders, you want lower amplitudes. The second order is what causes the nastiness and as you can see S54b32 and M54b30 are closely matched. Acceleration is key to look at, you want to minimise the piston at TDC decelerating and then accelerating again creating that little concave bump. The curve like the M54b25 has a more ideal shape with the flat plateau.

    Just because an engine is not ideal does not mean its crap, you just have to work with it a little more and consider what you can do to reduce the issues. As mentioned earlier in the thread getting a damper tuned for higher frequencies is a great place to start Click here to enlarge

    http://www.bimmerboost.com/images/im...c74c3b55-1.jpg

    http://www.bimmerboost.com/images/im...6daa5a5f-1.jpg

    http://www.bimmerboost.com/images/im...9f564874-1.jpg

    http://www.bimmerboost.com/images/im...42ac0feb-1.jpg

    http://www.bimmerboost.com/images/im...48bc1501-1.jpg
    Cool graphs - very cool... I am curious though - I was nearly certain that for the primary harmonic, the amplitude is a function of stroke? In other words, the longer the stroke - the higher the amplitude... Am I missing something?

  3. #253
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    Great post @Wazzu70. We need more members contributing technical information in this M54/S54 forum.

    I have to spread more reputation around or I would hit you again.

    Not bad for a Coug. Click here to enlarge

  4. #254
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    Click here to enlarge Originally Posted by Wazzu70 Click here to enlarge
    Here are the charts. I don't feel like typing an explanation for each one, so if you want to know what it means you can read up online Click here to enlarge

    Basics are, for the piston orders, you want lower amplitudes. The second order is what causes the nastiness and as you can see S54b32 and M54b30 are closely matched. Acceleration is key to look at, you want to minimise the piston at TDC decelerating and then accelerating again creating that little concave bump. The curve like the M54b25 has a more ideal shape with the flat plateau.

    Just because an engine is not ideal does not mean its crap, you just have to work with it a little more and consider what you can do to reduce the issues. As mentioned earlier in the thread getting a damper tuned for higher frequencies is a great place to start Click here to enlarge

    http://www.bimmerboost.com/images/im...c74c3b55-1.jpg

    http://www.bimmerboost.com/images/im...6daa5a5f-1.jpg

    http://www.bimmerboost.com/images/im...9f564874-1.jpg

    http://www.bimmerboost.com/images/im...42ac0feb-1.jpg

    http://www.bimmerboost.com/images/im...48bc1501-1.jpg
    Oh we getting fancy now!

  5. #255
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    Click here to enlarge Originally Posted by inlineS54B32 Click here to enlarge
    Cool graphs - very cool... I am curious though - I was nearly certain that for the primary harmonic, the amplitude is a function of stroke? In other words, the longer the stroke - the higher the amplitude... Am I missing something?
    Well, if you look at the graphs you will see a strong correlation to stroke. The relationship between the stroke and the connecting rod length is something you can use to balance the negative effects of an increased stroke.

    if you notice, the S54 and M54b32 nearly overlay each other even though the S54 has a longer stroke (by a small amount). The S54 also has slightly longer rods to help balance it out!

    Tomorrow I will try and remember to make a chart of two engines with the same stroke and different rod lengths to better illustrate.
    Last edited by Wazzu70; 04-04-2013 at 12:26 AM.

  6. #256
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    Click here to enlarge Originally Posted by MisterEm Click here to enlarge
    Great post @Wazzu70 . We need more members contributing technical information in this M54/S54 forum.

    I have to spread more reputation around or I would hit you again.

    Not bad for a Coug. Click here to enlarge
    Thanks! I owe you a beer if we ever meet up Click here to enlarge

    Funny thing is I just googled M54 head because I wanted to see the chamber shape and valvetrain layout. I saw Adams user name, and I like his technical posts so I decided to check it out.

    if I went to a 6 cyl I would go this route for the aluminum block and Double Vanos head since I have a standalone that can control both solenoids (VEMS). Now just have to hope I can destroy my current engine!

  7. #257
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    2 out of 2 members liked this post. Yes Reputation No
    Hi,

    Sorry this may be a bit off topic, but I am wanting to fit an S50 tubular exhaust manifold to a M54 engine, however there isn't enough studs for each flange (need 4 per flange x 6 = 24 studs). Has anyone drilled and tapped the remaining studs on the M54 cylinder head? I was worried about going through into the water ports.

    Thanks for your help.

    Al

  8. #258
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by Alun1976 Click here to enlarge
    Hi,

    Sorry this may be a bit off topic, but I am wanting to fit an S50 tubular exhaust manifold to a M54 engine, however there isn't enough studs for each flange (need 4 per flange x 6 = 24 studs). Has anyone drilled and tapped the remaining studs on the M54 cylinder head? I was worried about going through into the water ports.

    Thanks for your help.

    Al

    Good question.

    I've found some M54 cylinder heads have 4 studs per exhaust port, and some have 3 in an odd pattern across the head. The part numbers are also different.

    Would I drill out a head for the 4rth stud? Yes.
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  9. #259
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by PEI330Ci Click here to enlarge
    Good question.

    I've found some M54 cylinder heads have 4 studs per exhaust port, and some have 3 in an odd pattern across the head. The part numbers are also different.

    Would I drill out a head for the 4rth stud? Yes.
    Thanks for that. So that does mean there will be enough meat to drill into without going through into the water ports? I will go slightly less deep than the other studs. I just want to be 100% certain before doing this work.

  10. #260
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    Click here to enlarge Originally Posted by PEI330Ci Click here to enlarge
    Good question.

    I've found some M54 cylinder heads have 4 studs per exhaust port, and some have 3 in an odd pattern across the head. The part numbers are also different.

    Would I drill out a head for the 4rth stud? Yes.
    Is it just certain model years or is it random?

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

  11. #261
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Is it just certain model years or is it random?
    I think it's random.
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  12. #262
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    bump for an interesting teaser......

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