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Rick, et al;

The theoretical rise from ram air at our speeds (190 kts, a rise in itself)
is about 1.5 inches.  I see this difference by measuring and computing the
ambient air pressure and the reading on my EPI 800 manifold pressure
instrument.  I use a straight, smooth walled opening (little or no leakage,
parts connected with a rubber plumbing sleeve) directly to the front mounted
servo inlet.  There is no filtered or alternate air, therefore I have no
comparison numbers.  I expect my cylinders will reach their demise long
before TBO.

However, our compatriot wild and crazy builder Tom Giddings has fitted a ram
air pressure plenum with a large K&N filter and feeds his servo with
high-pressure low-speed air and sees about the same rise.  Perhaps he will
comment on his installation.

Scott Krueger
N92EX
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