FC3S Pro:  Intake Porting |
|
Custom "CZ" intake port template
I like to create intake porting templates from acrylic (Plexiglas) or
polycarbonate (Lexan) as the clear characteristics of these plastics
gives me a good idea how the port will look versus stock. |
|
Stage II intake porting completed on primary intake port
The pic sizes are small for a reason.  I charge for this porting, so
I like to keep my porting details a secret. |
|
Another pic of the Stage II primary port at a different
angle |
|
Comparison of worked port and unworked port
Notice the casting imperfection on the bottom of the passage on the
right-side, untouched passage.  The left-side, ported passage has this
casting imperfection eliminated.  Sorry for the blurry pic! |
|
Another pic of the comparison
You can clearly see that the right-side, untouched passage has a slight
bevel to it; the left-side, ported passage has this section eliminated. 
Sorry for the blurry pic! |
|
Two primary intake ports on the intake manifold side
I spend a lot of time getting rid of the imperfections in the passages; on
average, I spend about one hour for each intake port |
|
Custom "CZ" intake port template placed on stock Kouki FC 13BT primary
intake ports on center housing
The difference in port opening is 10° as stated from the Mazda factory
service manuals.  This means the earlier Zenki 13BT turbo engines run
larger stock ports on the primaries! |