Recent content by Walt Puryear

I think I have managed to answer my own question. Using Bernoulli’s equation with a few assumptions like laminar flow, which is certainly not the case, and a nice online calculator at http://hyperphysics.phy-astr.gsu.edu/hbase/pber.html I came up with the results that follow. Using my...

I agree that the airflow volume remains essentially the same, however air mass is 28% less at 9,000 feet. Since the venturi pressure drop is proportional to the working fluid density, it would seem less fuel would be drawn.

I’ve been trying to understand why a carbureted engine runs richer with altitude. I understand there is not as much power since less dense air results less mass charge and that oxygen percentage is lower at higher altitudes. Since a venturi’s drop in pressure is given generally by the...