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cpayne(at)joimail.com
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 Posted: Fri Feb 03, 2006 4:08 am Post subject: Foam Filters |
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I have used a Brackett air filter for several years now with no problems. I believe the stock # is BA197E. On the CJ flame arrester, I unsoldered the wire mesh but left the arrester body in place to hold the filter. To compensate for any lost MP, the air scoop is isolated from leakage into the cowl side and a low drag lip installed at the opening.
The oil analysis for each 50 hour change come back with low levels of silicon (dirt), 12ppm is highest, 4ppm the lowest. There is also a 10 micron oil filter installed. All engine vents are covered with foam socks. Nary a problem in 800 hours.
Craig Payne
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rogerbyak(at)yahoo.com
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| Posted: Fri Feb 03, 2006 6:48 am Post subject: Foam Filters |
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Craig; Did you do any before and after testing concerning the MP and the effect of the scoop and removal of the screen?
I have used the Brackett filter since I got my CJ...approx 300 hours and did neither of the mods that you mention. I wonder if I have lost any MP? rb
Craig Payne <cpayne(at)joimail.com> wrote:
| Quote: | I have used a Brackett air filter for several years now with no problems. I believe the stock # is BA197E. On the CJ flame arrester, I unsoldered the wire mesh but left the arrester body in place to hold the filter. To compensate for any lost MP, the air scoop is isolated from leakage into the cowl side and a low drag lip installed at the opening.
The oil analysis for each 50 hour change c ome back with low levels of silicon (dirt), 12ppm is highest, 4ppm the lowest. There is also a 10 micron oil filter installed. All engine vents are covered with foam socks. Nary a problem in 800 hours.
Craig Payne
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cpayne(at)joimail.com
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| Posted: Fri Feb 03, 2006 12:42 pm Post subject: Foam Filters |
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Roger,
In an absolute sense, filtering of any kind will incur some MP loss. That's why Mooney's had a cruise position in the intake to draw in unfiltered air for efficiency at altitude. In my case, I'll live with a little loss in order to get those great oil analysis reports. Not all my flying is at cruise altitude, lots of FOD on low passes :>)
Craig Payne
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