I'm using a K&N air filter. I considered going without, but since I
expect to operate out of allot of dirt strips and I really don't think it would
be too healthy for the turbo compressor, I decided to incorporate one.
Hi Todd,
I’m curious, what size is your
filter? I have a K&N cylindrical style filter, that’s 6”
long, and 3.5” diameter, and is made to fit over a 2.5” diameter
flange. They claim it will flow 900 cfm, and I can only hope that they
mean at a reasonable pressure differential. Spruce sells preformed
aluminum flanges in several sizes, so I plan to rivet a couple of those back to
back on the side of a simple air box. Since the right cheek is empty, I’ll
probably go ahead and install the filter over there. I’ll use the
same size tubing for the inlet and outlet of the filter box, so I can bypass it
for tests. Actually, while thinking about the issue of gyro loads on the
turbo bearings, I wish I had some sort of filter or screen between the turbo
and intake. A broken compressor blade would ruin your day.
Another factor to consider is the turbo
boost. Unrestricting the intake has the same effect as unrestricting the
exhaust, and doing both will get you in real trouble with a 3rd gen
RX-7. If boost creep is a serious problem, maybe I can borrow Mark’s
oil soaked filter :-)
Cheers,
Rusty (eternally two months from flying)