Mazdanowski

If any knowledgable, experience porters have any thoughts regarding this I would appreciate it. Let me explain.

The opening edge of the primary port seems to get very close to the trailing edge of the side seal early in its cycle then becomes quite conservative until the closing of the primary where it has the radius, possibly to drop the trailing edge of the side seal and then bring it back up. But right in the middle of the primary port opening there is a lot of metal between the port opening and the side seal closing line. Sort of an S shaped opening. Not at all like any previous intake port openings.

The secondary port seems to do the same thing but to a smaller degree.

The aux port seems to leave a lot of metal between its opening and even the closing line. I say this because I made a plexiglass trace of the lead and trailing edges of the side seal and compared it to both the stock Renesis intake port and Racing Beats intake port template. The aux opening even seems to be a little more conservative than an NA S4/5 opening.

I assume all of this was done to provide support to the closing edge of the side seal for a motor that has to last 150K miles plus, work with the pressure wave tuning, etc.

If I were making up a weber type manifold for the Renesis or using Renesis internals on a NA 2nd gen housing and a weber manifold and would not be getting the DEI effect is there any reason NOT to port the intake opening more aggressively on a race motor?

Can't the intake opening on the ports at least consistantly track up to the closing line for a conservative street port?

If I want to be more aggressive can't I push it almost up to the leading edge line all the way through the port? (No S shaped opening or belly bump on the primary)

Mazda had a lot of engineers working on the renesis to get every HP out of it they could with the constraints they had. I can't understand why the aux seem to open so late. Well beyond the trailing edge of the side seal. I think I could open the aux .15 earlier just to get to the trailing edge of the aux. I know opening the aux earlier would probably have required Mazda to run a shorter runner on the aux but I can't see why they didn't. I wonder if I am missing something. Is there another good reason to have the aux opening so late?

Any reason I should leave that conservative aux port opening when not using the stock renesis intake manifold?

Again thanks