Kevin Hortonwrote:

I'm not sure how much manifold pressure is lost going through a well
designed filter. But, for the sake of argument, if we assume a loss of
0.5" HG manifold pressure, my O-360 power spreadsheet tells me that would
be about a 4 hp loss at a 75% cruise condition at 7500 ft, or about 3% of
the power. A 3% power loss would give about a 1% speed loss. If you want
to compensate for the loss in power by increasing the rpm, you need about
a 150 rpm increase to get the same power you would have had with no air
filter losses.
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For the sake of argument, if we assume...
My *RAM AIR* only yields 0.75" HG with NO filter...
it's not difficult to understand why a filter is anathema
to the designed RAM AIR system.


Barnyard BOb --