from another forum wrote:
Top view is correct. The roof is connected with the adaptor correct to allow the airflow flow without big restrictions.
Is that correct?
I'm not sure you have it, I believe(not sure by how you described it) your visual is perceiving it correctly... but you don't quite have the grasp on what you see. First, the views are upside down... the top of each photo is actually the floor of the port.
So if you were going for roof alignment, then the choice was the bottom one... but this is a highly technical question.... and it somewhat refers back to changing the port roof angle. The VERY LAST thing I want to touch is any ports floor just before it bends to the valve. So if I position the manifold to the very bottom edge of the port, and hold that as my constant, I can then add a bit more angle to the port roof by matching the port to the manifolds roof. So the top view is correct, but because by placing it that way I can further increase the port roof angle....
and to paraphrase Margaret Stewart.... , "and that's a good thing"
A hint... before you look at anything of mine describing ports/bowls/valves... always look for the cues that tell you if it is port/bowls/valves up, or down
The 4 manifold/port/bowls...
These will be my controls... Since this is the first time I've worked an ITB manifold and the matching head.
note how all of them, even the 2 ports mostly shaped... can still benefit for a bit more removed
from the roof...
It is also more than it appears...
So besides now being able to further raise the roof, I also need to shape the inside of the itb manifold too
The T3 manifold has a mild slope built into them, the round boring, which is also the mounting face of the ITB, is @ a shallow angle, while the manifold boring is horizontal, similar to the head. Where these two bored holes meet will also be ported...
The floors machined edge will get blended to minimize air disturbance directly behind the throttle plates.... I'm also working on a way to minimize those vacuum ports....
other person in forum above wrote:
I'm wondering what will turn out of this, because I've done the same thing (smallport head, T3 adapter, Blacktop 45mm ITBs) last year, with the same ideas, and I had to remove a "half kg" of aluminium from the head to look like something good flowing thing. What cams will you(costumer) use for this setup, with what C/R ?
Cams... Toda 272 9.00mm lift... 1SZ buckets.... I've advised... the client to purchase a set of silvertop throttles... the blacktop throttles are unnecessary
I'm only doing the head work... but I'm advising a 4-4.25cc piston dome, as flat as possible... made for STANDARD valves... NOT OVERSIZE.(will provide a static CR between 11.9 and 12.9 depending on his choice of chamber volume (36cc down to 33cc) Final squish should be .9mm(.035"), deck and gaskets is by choice as long as squish gets to .035" and no less!
More to come.....