BC12D-4-85
SPONSOR
Fairbanks, AK.
The Brackett filter is comprised of two components that could potentially capture and retain moisture...the foam filter and the perforated metal backing plate. I assume the metal plate serves as a retainer for the foam element to prevent ingestion, and flame retarder in case of intake system backfire.
I'll leave it at this...I have observed the foam element saturated and rigid with frozen moisture/snow/water, and the foam element stuck to the backing plate when removal for drying was done. Those were in unusual conditions under the right temps and visible moisture or snow/ice crystals.
I've experienced no engine stoppage with a Brackett just a loss of normal manifold pressure at full throttle when it's contaminated. I use the MP gauge to note WFO MP...I like to see no more than a 2" drop below ambient and 1" is good with a non-Brackett element. I also note just above idle MP...lower is better and 10" typical for a tight engine. As they wear or leak it'll gradually increase. If curious, test your engine MP with or without your filter in place...it may be interesting...same for static RPM open or filtered.
GAP
I'll leave it at this...I have observed the foam element saturated and rigid with frozen moisture/snow/water, and the foam element stuck to the backing plate when removal for drying was done. Those were in unusual conditions under the right temps and visible moisture or snow/ice crystals.
I've experienced no engine stoppage with a Brackett just a loss of normal manifold pressure at full throttle when it's contaminated. I use the MP gauge to note WFO MP...I like to see no more than a 2" drop below ambient and 1" is good with a non-Brackett element. I also note just above idle MP...lower is better and 10" typical for a tight engine. As they wear or leak it'll gradually increase. If curious, test your engine MP with or without your filter in place...it may be interesting...same for static RPM open or filtered.
GAP