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I have the Airflow Performance ram air valve on my Lycoming IO360.
This valve does not close off the filter when ram air is selected. I
have wondered how much ram air pressure I was losing back through the
air filter (and believe this has been debated on the LML). According
to the following test by an RV builder, with a similar installation to
mine, there is no loss. See the attached RV link and a photo of my
installation.
http://www.rvproject.com/20050426.html
Clark Baker
LNC2 360
660hrs
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