Want to post up a picture of the mentioned LS chamber and piston?
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
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?
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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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