[Diy_efi] Venturi effect crankcase breather

Zenon Two zenon222 at hotmail.com
Thu Jul 10 04:09:07 GMT 2003


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<P>does increasing manifold pressure (via forced induction) have the same effects as decreasing crankcase pressure?<BR><BR></P></DIV>
<DIV></DIV>&gt;From: Adam Wade <ESPRESSO_DOPPIO at YAHOO.COM>
<DIV></DIV>&gt;Reply-To: List for general do-it-yourself EFI talk <DIY_EFI at DIY-EFI.ORG>
<DIV></DIV>&gt;To: List for general do-it-yourself EFI talk <DIY_EFI at DIY-EFI.ORG>
<DIV></DIV>&gt;Subject: RE: [Diy_efi] Venturi effect crankcase breather 
<DIV></DIV>&gt;Date: Wed, 9 Jul 2003 17:44:04 -0700 (PDT) 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;--- Jack Vines <JACKV at AMBASSADORPROGRAMS.ORG>wrote: 
<DIV></DIV>&gt; 
<DIV></DIV>&gt; &gt; Can you help me better understand what specific 
<DIV></DIV>&gt; &gt; factors involved in pulling a vacuum in the 
<DIV></DIV>&gt; &gt; crankcase cause the dramatic drop in engine life 
<DIV></DIV>&gt; &gt; and which parts wear faster and why? Are we talking 
<DIV></DIV>&gt; &gt; ring wear, bearing wear, piston skirt wear? 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;As I was led to understand by the Harley engineer (who 
<DIV></DIV>&gt;is also a race engineer for several AMA Formula Xtreme 
<DIV></DIV>&gt;teams, I should also add), there was significant 
<DIV></DIV>&gt;additional ring wear once you got past a certain level 
<DIV></DIV>&gt;of depression in the crankcase. He didn't go into too 
<DIV></DIV>&gt;many details, but I suspect there may be bending of 
<DIV></DIV>&gt;the ring with fairly low pressures that cause the wear 
<DIV></DIV>&gt;to be concentrated on the upper edge of the ring face 
<DIV></DIV>&gt;(although this is merely supposition on my part). 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;===== 
<DIV></DIV>&gt;| Adam Wade 1990 Kwak Zephyr 550 (Daphne) | 
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