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From: Douglas Johnson <lancair1@bellsouth.net>
Subject: Re: [LML] Re: Crankcase "venting" after flight
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---670652195-683295191-1332515994=:69492
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Brent, a question: I understand the principle of the venting, but living in hot/humid Florida I wonder if venting out the humid air in the engine and "replacing" it with humid ambient air gets me anywhere? I must admit I always thought just the opposite, i.e., that down here the hot engine innards just after flight might have LESS humidity than the outside air. This has been an education...
Doug

Douglas W. Johnson MD, FACR
8265 Riding Club Road
Jacksonville, FL 32256
(904) 351-6114
www.frogdocs.com
Lancair1@bellsouth.net

--- On Fri, 3/23/12, Gary Casey <casey.gary@yahoo.com> wrote:






From Brent:
Letting the crankcase vent after a flight is a good idea. It is a better idea after a short flight where the oil has not been hot for long, after low altitude flights where the vapor pressure is low relative to the crankcase pressure or in humid climates.

Opening the oil cap will cause air to flow in the crankcase vent and out the filler due to convection. Most of the crankcase vapors will likely be displaced in the time it takes to secure the airplane. Secure the cap and close the door when ready to leave. If you have to walk away with the cap off, flag the oil door with a "Remove Before Flight" banner.

Brent Regan

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<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Brent, a question: I understand the principle of the venting, but living in hot/humid Florida I wonder if venting out the humid air in the engine and "replacing" it with humid ambient air gets me anywhere? I must admit I always thought just the opposite, i.e., that down here the hot engine innards just after flight might have LESS humidity than the outside air. This has been an education...</DIV>
<DIV>Doug<BR><BR>Douglas W. Johnson MD, FACR<BR>8265 Riding Club Road<BR>Jacksonville, FL 32256<BR>(904) 351-6114<BR>www.frogdocs.com<BR>Lancair1@bellsouth.net<BR><BR>--- On <B>Fri, 3/23/12, Gary Casey <I>&lt;casey.gary@yahoo.com&gt;</I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="BORDER-LEFT: rgb(16,16,255) 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><BR>
<DIV id=yiv1983478379>
<DIV>
<DIV style="BACKGROUND-COLOR: #fff; FONT-FAMILY: bookman old style, new york, times, serif; COLOR: #000; FONT-SIZE: 12pt">
<DIV><SPAN style="FONT-FAMILY: arial, helvetica, sans-serif; COLOR: rgb(69,69,69); FONT-SIZE: 13px" class=yiv1983478379Apple-style-span>From Brent:</SPAN></DIV>
<DIV><SPAN style="FONT-FAMILY: arial, helvetica, sans-serif; COLOR: rgb(69,69,69); FONT-SIZE: 13px" class=yiv1983478379Apple-style-span>Letting the crankcase vent after a flight is a good idea. It is a better idea after a short flight where the oil has not been hot for long, after low altitude flights where the vapor pressure is low relative to the crankcase pressure or in humid climates.<BR><BR>Opening the oil cap will cause air to flow in the crankcase vent and out the filler due to convection. Most of the crankcase vapors will likely be displaced in the time it takes to secure the airplane. Secure the cap and close the door when ready to leave. If you have to walk away with the cap off, flag the oil door with a "Remove Before Flight" banner.<BR><BR>Brent Regan</SPAN><BR></DIV></DIV></DIV></DIV></BLOCKQUOTE></td></tr></table>
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