Jerry Hey wrote:

Paul,  in this image the heavy black dash line represents the LeMan p
port opening in my insert.  As you can see, the insert would be reduced
to zero thickness  at the bottom to achieve the opening timing.  I
don't see a problem with that. As an alternative the insert itself can
be centered on the LeMan opening.   The LeMan port opens very early.
Apparently, there is more than one Mazda P Port design. From Paul Yaw's
site I got the following  numbers for the"Mazda Factory P Port."
  I.O.: 86BTDC
I.C.: 75ABDC
The intake opening is nearly the same as my initial effort will be:
thin red rounded rectangle in the drawing. The I.C. in my effort is at
69º ABDC.    I am looking for any comments that will correct errors in
my thinking before I get out the die grinder.   Thanks,  Jerry

Porting of all types work over a relatively wide range. I think you are
overly worried about the exact timing.

Paul Lamar
 
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