About air filters:
I flew a while with a cheap foam
filter,
Sounds like a UNI-Filter. I used
to use them on my modified Ski-Doos when I was too poor to afford the
K&N. They work OK.
So
keep those filters from collapsing.
I was concerned about this,
so I built a vacuum relief valve, which is an integral part of my filter
box. In the unlikely event of a filter plug due to dirt or more likely ice,
it will simply overcome the spring pressure and allow unfiltered air from
inside the cowl to flow. I probably won't even know if it has
opened.
S. Todd Bartrim
Turbo 13B rotary powered
RX-9endurance (FWF)
C-FSTB
(reserved)
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
"Imagination is more important than knowledge"
-Albert
Einstein