|
Greetings David,
I have a question about the modifications to the intake bowl area right next to the valveguide. By looking at this area through the manifold-side of the head (in the "Finished Ports" photo,) it's curious to me that the area to the right of the valveguide (i.e., closer to the bore centerline,) which you said was was deepened about 1mm, seems to form a helical channel with roughly a 45-degree departure from verticality as seen in this photo, from bowl roof, approaching the valve seat. If the local air/fuel flow follows this channel, then it would seem that upon exiting the valve, it would be headed for a nearly right-angle crash with the cylinder bore.
It would also seem to direct flow in a way that would be exactly counter to that needed to enhance swirl.
Now knowing that you would never do such a thing, my question is, how are my intuition and understanding failing me? To clarify the dilemma I have, my opinion would be that to enhance swirl, one would want to create exactly the mirror-image of the bowl as you (and GM) made it, dam and all!
Thank you,
Mark
|