Those that are already flying are much
better equipped to answer the tuning question, but IIRC, Tracy has
talked about one of the 'problem areas' of tuning that can't be
tuned on the ground is the high rpm/low MAP region as you'd see
in a decent. Might be worth a dive into the archives to see what
he recommended.
On port diameter: The 'conventional wisdom' is that you need to
maintain some (not well defined) level of air velocity in the
manifold runners. So it logically follows that the entire length
should be the same diameter. Some tuning techniques use a tapered
runner that is smallest at the valve (our intake port) so that the
air is accelerating as it reaches the combustion chamber, but
seems to me that simply necking down the port at the side of the
block would just create a really bad flow separation at that
point.
On 6/5/2021 9:51 AM, Matt Boiteau
mattboiteau@gmail.com wrote: