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Thread: Tech talk: Why 2v heads need more advance than 4v heads.

  1. #151
    Join Date
    Sep 2005
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    e30
    Want to post up a picture of the mentioned LS chamber and piston?
    -Nick
    91 E30 M42 on VEMS

    Turbo Camshaft Thread

  2. #152
    Join Date
    Mar 2006
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    Deland, FL
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    1998 528i-t, & Jap Stuff
    Alchemee posted some examples of a slightly modified head. A lot of the pistons are flat top, some of the lower compression motors had a dish top.




    Random googled photos of LS2 parts for example.

    I particularly love the spark plug placement.
    13.239 @ 105.67 with .000 R/T and 1.93 - 60' - 2007 350z - SOLD
    Slow in turbo 528i thanks to a poor driver and lots of heat soak (I couldn't figure out how to drive a pucked clutch off the line to save my life).

    LM7 swap in progress/paused pending garage remodel.
    http://forums.bimmerforums.com/forum....php?t=1660651





  3. #153
    Join Date
    Jan 2007
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    Shreveport
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    2JZ E30
    Going to resurrect this thread for some of you.

    I have an M20 with a B27 bottom end, and the 885 head. Would this combo require even more timing then a normal B25 head/bottom? I am running what seems to be a lot of timing, even in boost up to 20psi. So lets say where a B25 requires 23* of timing, would the b27 bottom require even more? If so, how much?
    - AXIS POWERS - 2JZ E30 Build -
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    318Racing.org

  4. #154
    Join Date
    Jul 2004
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    325is, 96 M3 Euro
    IMO with lower compression and lack on mixture motion due to mismatch in piston and head yes it would burn a little slower and require a little more advance
    Last edited by digger; 04-15-2018 at 01:24 AM.

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