Gary said:
>Matching the bores when there is such a small step size, and especially
>if they are smaller, rather than larger, than the phenolic blocks, is,
>as some other posts mention, probably not worth the effort.
I'm not so sure. Even a small and/or partial lip anywhere in the airflow
path MIGHT tend to create interference swirls far out of proportion with
what you'd think. You're pushing the air column against and past a (so to
speak) flat wall. Has anyone seen any photos of airflow under these
conditions? Of course you could just measure the difference, if any, in
airflow between unmatched and matched ports, but that would be as much
fun to look at.<G>
It would also be interesting to find out at what point a difference in
manifold and port size does become a major factor. For instance, the SU
(SSS) intake for an L-16 has 1 1/2 inch ports whereas the OEM L-16 heads
had 1 1/4 ports. It would be interesting to compare flow with that
combination, with the head opened up to match (Street Prepared legal) and
with the SSS 1 1/2 inch port head. That info may be floating around
somewhere or you might be able to model it in one of the desktop engine
programs.
FWIW, Ron
Ronnie Day
rday@cyberramp.net
___________
The ACL Group
Arlington, Texas
(817) 572-0873 (V)
(817) 478-2896 (F)
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