Close

Results 1 to 10 of 10
  1. #1
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    131,368
    Rep Points
    38,072.9
    Mentioned
    2353 Post(s)
    Rep Power
    381


    Yes Reputation No

    ABR N55 cylinder heads

    Looks great but what is done to it?

    Also, @alex@ABRhouston do you have any flow numbers for any of your heads or even the stock N54/N55/S55 heads?

    Click here to enlarge

  2. #2
    Join Date
    Jun 2013
    Location
    North Houston
    Posts
    1,398
    Rep Points
    2,264.4
    Mentioned
    143 Post(s)
    Rep Power
    23


    1 out of 1 members liked this post. Yes Reputation No
    This one was a simple re-do. We keep N54 Stg1 assembled heads, and Stg3 bare heads ready for client's request of stock or aftermarket valvetrain ready to ship.
    We also have a good assortment of completely stock/rebuilt N54's for stock applications, Closed deck N54's with JE pistons and stock rods, Closed deck N54's with JE pistons and Pauter rods, and a few 3.1 low compression N54 closed deck punishers in stock. We try to keep up with demand and make a quick turn around (although we're about 6 engines behind right now due to my wife and I having a kiddo!)


    BTW, we have our own line of valvetrain we've developed and made for N55 and S55 now.

    We have some neat stuff with the headwork we've come across doing these newer heads.

    They move some numbers for sure. We outflow all of our competitors at 28" on our Superflow dyno.
    Word of warning- any of our heads will require from 10-40% more fuel.... Be warned.
    Our stg1 stock valvetrain on a single turbo/pump gas engine we built is out of octane at just 17psi.
    It needed a Stg3 PRR fuel pump set up and new HPFP to keep up.... and the HPFP is barely hanging on. PSI is just a restriction, and simply doing our Stg1 head makes a remarkable difference.

    Our Stg 3 N54 with stock size Ferrea valve train made 640 at 20psi, and 750 at 26psi on a built single.

    I have numbers on VAC's (204), MMP's (225), and our V1.3 N54 Stg3 (229).

    I feel these numbers are very plausible despite being on different flow benches, as MMP has the same "before" CFM number as us (165), and VAC's was 160.
    So, if we compensate VAC's numbers to match the other 2- their's would be 210.

    We're still making changes on the N55 and S55, we've got cylinder heads cut open and investigating some more mods, but they make some power for sure.
    Attached Images Attached Images  
    Click here to enlarge
    Burger Motorsports dealer
    Turner Motorsports dealer
    Bimmerworld dealer
    Active Autowerks Dealer
    Shipping built/stroked/CNC ported N54's Internationally!
    Follow us!
    http://www.facebook.com/BMWdoctor
    http://twitter.com/abrhouston
    http://instagram.com/abrhouston/
    http://abrhouston.com
    http://abr.genbook.com Book online appointments!

  3. #3
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    131,368
    Rep Points
    38,072.9
    Mentioned
    2353 Post(s)
    Rep Power
    381



    Yes Reputation No
    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    I have numbers on VAC's (204), MMP's (225), and our V1.3 N54 Stg3 (229).
    Would we be able to see these numbers?

  4. #4
    Join Date
    Jun 2013
    Location
    North Houston
    Posts
    1,398
    Rep Points
    2,264.4
    Mentioned
    143 Post(s)
    Rep Power
    23


    1 out of 1 members liked this post. Yes Reputation No
    Sure, i can throw em up here.
    someone's stock data plot sure seems to be the same as ours Click here to enlarge
    Wouldn't surprise me, based on other things I've seen copy/pasted.
    Attached Images Attached Images    
    Click here to enlarge
    Burger Motorsports dealer
    Turner Motorsports dealer
    Bimmerworld dealer
    Active Autowerks Dealer
    Shipping built/stroked/CNC ported N54's Internationally!
    Follow us!
    http://www.facebook.com/BMWdoctor
    http://twitter.com/abrhouston
    http://instagram.com/abrhouston/
    http://abrhouston.com
    http://abr.genbook.com Book online appointments!

  5. #5
    Join Date
    Aug 2015
    Posts
    384
    Rep Points
    714.5
    Mentioned
    4 Post(s)
    Rep Power
    8


    Yes Reputation No
    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Sure, i can throw em up here.
    someone's stock data plot sure seems to be the same as ours Click here to enlarge
    Wouldn't surprise me, based on other things I've seen copy/pasted.
    When do you expect N55 flow data and will that Stage 1 cost the same as the N54? Also, will you have any in stock for core charges?

  6. #6
    Join Date
    Jun 2013
    Location
    North Houston
    Posts
    1,398
    Rep Points
    2,264.4
    Mentioned
    143 Post(s)
    Rep Power
    23


    1 out of 1 members liked this post. Yes Reputation No
    I need to go get them written down/recorded kinda like the excel set up i did for our N54's.

    No, N55 will be much higher, if it's assembled with the valvetronic shaft/rockers/etc- as they take a remarkably long time to assemble (correctly) and literally doing the valve job is much harder due to the cam tower that is in the way (we had to make new assembly tools lol)

    I have 5 N55's here I'm fixin to run thru CNC to close deck them, and the heads will be off/available- so yes, to answer your question.
    Click here to enlarge
    Burger Motorsports dealer
    Turner Motorsports dealer
    Bimmerworld dealer
    Active Autowerks Dealer
    Shipping built/stroked/CNC ported N54's Internationally!
    Follow us!
    http://www.facebook.com/BMWdoctor
    http://twitter.com/abrhouston
    http://instagram.com/abrhouston/
    http://abrhouston.com
    http://abr.genbook.com Book online appointments!

  7. #7
    Join Date
    Dec 2013
    Posts
    41
    Rep Points
    51.0
    Mentioned
    0 Post(s)
    Rep Power
    0


    Yes Reputation No
    Nice gathered Data over there, I know and believe in porting intake will allow faster/more air in the cylinders, but lets discuss stock vs ported scenario that I might need some clarification in:

    6266 single turbo N55
    Stock head:
    I dyno 500whp/411wtq at 21psi, 93 octane. where octane limit is reached.

    with ported head:
    I believe I would get same result with greater spool and lower intake pressure.
    like 18psi or 17psi ~ 500whp.

    but will we still reach the same octane limit at the 520-550whp power levels if we don't touch the exhaust port ?

    With 13% gain in exhaust port flow it will allow more power at same 93 octane?


    Thanks in advance, I tried to find answers to my questions online on many other forums but couldnt find an answer.Click here to enlarge

  8. #8
    Join Date
    Jun 2013
    Location
    North Houston
    Posts
    1,398
    Rep Points
    2,264.4
    Mentioned
    143 Post(s)
    Rep Power
    23


    Yes Reputation No
    You are actually really close to what we see on our Stg1 heads. The 135 we built at the shop on pump gas maxed out it's octane around 17psi, when it should be close to your 21 psi number. So, efficiency is shown there.

    Now, we can't change what octane does, and yes- I think you'll still be around the same horsepower number until more octane is put into the system (Meth, E85, etc)
    You'll run out of fuel quickly too on factory DI, as the head is more efficient.
    Click here to enlarge
    Burger Motorsports dealer
    Turner Motorsports dealer
    Bimmerworld dealer
    Active Autowerks Dealer
    Shipping built/stroked/CNC ported N54's Internationally!
    Follow us!
    http://www.facebook.com/BMWdoctor
    http://twitter.com/abrhouston
    http://instagram.com/abrhouston/
    http://abrhouston.com
    http://abr.genbook.com Book online appointments!

  9. #9
    Join Date
    Dec 2013
    Posts
    41
    Rep Points
    51.0
    Mentioned
    0 Post(s)
    Rep Power
    0


    Yes Reputation No
    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    You are actually really close to what we see on our Stg1 heads. The 135 we built at the shop on pump gas maxed out it's octane around 17psi, when it should be close to your 21 psi number. So, efficiency is shown there.

    Now, we can't change what octane does, and yes- I think you'll still be around the same horsepower number until more octane is put into the system (Meth, E85, etc)
    You'll run out of fuel quickly too on factory DI, as the head is more efficient.
    Thanks for the clarification, I have PI to reach beyond 440hp barrier without being superlean.

    Another question as you probably inspected enough N55s, could N55B30 be revved like S55 to 7.5k with factory internals?

  10. #10
    Join Date
    Jun 2013
    Location
    North Houston
    Posts
    1,398
    Rep Points
    2,264.4
    Mentioned
    143 Post(s)
    Rep Power
    23


    Yes Reputation No
    S55 has a forged crank vs N55's cast.
    S55 has closed deck factory. N55 is open deck.
    While I've not done a direct comparison, I'm willing to bet the S55 is balanced better than N55.
    I bet it'd do it for a while, but not last forever.

    Biggest issue with both, is the hub slipping. Good thing we have pinned/keyed hubs to fix that issue for N55/S55 and N54 Click here to enlarge
    Click here to enlarge
    Burger Motorsports dealer
    Turner Motorsports dealer
    Bimmerworld dealer
    Active Autowerks Dealer
    Shipping built/stroked/CNC ported N54's Internationally!
    Follow us!
    http://www.facebook.com/BMWdoctor
    http://twitter.com/abrhouston
    http://instagram.com/abrhouston/
    http://abrhouston.com
    http://abr.genbook.com Book online appointments!

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •