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Thread: M52B30 Turbo Piston Ring Gap Help

  1. #1
    Join Date
    Apr 2014
    Location
    Cardiff, UK
    Posts
    247
    My Cars
    E39 528i, E46 325ti

    M52B30 Turbo Piston Ring Gap Help

    Hi All, I'm in the process of starting to rebuild my m52b30 and just wanted to see what the recommended piston ring gap was for a turbo setup? I've got the ally euro block and I'm running stock m54b30 bottom end with oem rings etc. I'll be running a mls type head gasket which I think should see my compression around 9.0:1 maybe!

    Running an ebay Gt35 turbo and if possible I'd like to aim for about a bar of boost or around 350whp or more.

    Should I just go with the oem ring gap and leave the rings alone or should I be gapping them?

    Any advise would be great.
    Thanks
    Rob

  2. #2
    Join Date
    Mar 2012
    Location
    Renton, Wa
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    5,058
    My Cars
    98 m3

    M52B30 Turbo Piston Ring Gap Help

    Open the up a few thou.

    I have seen pretty large deviation in oem gap across cylinders. Open them all up to 18 thou or so and you’ll have less worries


    Sent from my iPhone using Tapatalk
    Last edited by vollosso; 07-09-2018 at 02:45 PM.
    1989 535i - sold
    1999 Tiag/Dove M3 - sold
    1998 Turbo Arctic/black - current
    2004 TiAg/Black - Current

    PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  3. #3
    Join Date
    Apr 2014
    Location
    Cardiff, UK
    Posts
    247
    My Cars
    E39 528i, E46 325ti
    Ok great, thanks very much for the help.

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