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From: Bill Hannahan <wfhannahan@yahoo.com>
Subject: Crankcase Vacuum
X-Original-To: MAIL LANCAIR <lml@lancaironline.net>
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  The diaphragm fuel pump on 4 cylinder Lycomings and perhaps others, generates output pressure referenced to crankcase pressure. 
   
  My carbureted engine has a 7 psi pump, so if I pull case pressure 7 psi below induction pressure the float bowl will soon be empty.
   
  Likewise, if I restrict the vent and pressurize the case, fuel pressure will go up, maybe enough to force fuel past the needle and flood the engine.
   
  This might be a good place for the “Keep It Simple” and reliable rule.
   


BILL HANNAHAN 
WFHANNAHAN@YAHOO.COM

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<DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><FONT face="Times New Roman">The diaphragm fuel pump on 4 cylinder Lycomings and perhaps others, generates output pressure referenced to crankcase pressure. </FONT></SPAN></DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><FONT face="Times New Roman"><o:p></o:p></FONT></SPAN>&nbsp;</DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
 style="FONT-SIZE: 10pt"><FONT face="Times New Roman">My carbureted engine has a 7 psi pump, so if I pull case pressure 7 psi below induction pressure the float bowl will soon be empty.</FONT></SPAN></DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><FONT face="Times New Roman"><o:p></o:p></FONT></SPAN>&nbsp;</DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><FONT face="Times New Roman">Likewise, if I restrict the vent and pressurize the case, fuel pressure will go up, maybe enough to force fuel past the needle and flood the engine.</FONT></SPAN></DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><FONT face="Times New
 Roman"><o:p></o:p></FONT></SPAN>&nbsp;</DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><FONT face="Times New Roman">This might be a good place for the “Keep It Simple” and reliable rule.<o:p></o:p></FONT></SPAN></DIV>  <DIV class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 14.4pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN style="FONT-SIZE: 10pt"><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></DIV><BR><BR><DIV id=RTEContent>BILL HANNAHAN <BR>WFHANNAHAN@YAHOO.COM</DIV><p>__________________________________________________<br>Do You Yahoo!?<br>Tired of spam?  Yahoo! Mail has the best spam protection around <br>http://mail.yahoo.com 
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