Page 7 of 7 FirstFirst 1234567
Results 151 to 154 of 154

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

  1. #151
    Join Date
    Sep 2005
    Bellingham, WA
    My Cars
    Want to post up a picture of the mentioned LS chamber and piston?
    91 E30 M42 on VEMS

    Turbo Camshaft Thread

  2. #152
    Join Date
    Mar 2006
    Deland, FL
    My Cars
    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.

  3. #153
    Join Date
    Jan 2007
    My Cars
    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 -
    Interested in Drifting in the ArkLaTex? Join us at ArkLaTexDrift!

  4. #154
    Join Date
    Jul 2004
    Sid Knee
    My Cars
    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 02:24 AM.

Page 7 of 7 FirstFirst 1234567


Posting Permissions

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