TwinTurbo.NET: Nissan 300ZX forum - While I understand the additional variables that would make
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Subject While I understand the additional variables that would make
     
Posted by SirpriZ on May 06, 2019 at 5:06 PM
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In Reply To having a clean answer would be nice posted by shaggee on May 06, 2019 at 08:15 AM
     
Message the CR vary from head to head, I am trying to get an educated, rough idea based on the volume of a stock head and how the removal of the boss affects CR. While the change in CR has a variety of other influences, the change in volume should be constant. Again, your points are valid, but I think removing that much material is going to have the greatest single influence on CR. I was hoping one of the members with significant experience working on our heads (that doesn't sound right), or someone that works in that Z world would have a good idea (like BDE, Kyle, Ash, SZ, EP Racing, etc). I was just curious as to the (as good an estimate as possible, based on a stock head) effects that removal of the boss has on
CR and how much combustion chamber volume changes (that should be
a fixed value).

     
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