Experiments and discoveries are moving forward over the past few days with some
entertaining results.
A rudimentary study of some baffle concepts were drafted and run through the
simulator;
the variations happened by accident due to forgetting to half the density
consumption to rpm speed; so the elongated porting was developed and employed
on these over calculated equations of x2 actual rpm; once recalibrated the
results were pleasing on all the variations.
Flow analysis through the air box was applied at 6000, 5500, 5000, 4000 rpm at
1013.25 atmosphere at 20.05C. Filtering for Static Pressure primarily, and
Acoustic
Energy and Flow Path as added features.
Red represents Ambient Atmospheric Pressure which indicates zero restriction to
air flow within the airbox at engine rpm.
Testing revealed the carburettor porting tubes are slightly undersized causing
a pressure drop in these regions at engine speeds above 4000rpm on normally
aspirated
setups. At 6000rpm the pressure drop equates to approx 600' altitude increase,
and at 5500 rpm approx 300' altitude increase, and at 5000rpm around
80' altitude increase.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510475#510475
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