[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>>From: Adam Wade <ESPRESSO_DOPPIO at YAHOO.COM>
<DIV></DIV>>Reply-To: List for general do-it-yourself EFI talk <DIY_EFI at DIY-EFI.ORG>
<DIV></DIV>>To: List for general do-it-yourself EFI talk <DIY_EFI at DIY-EFI.ORG>
<DIV></DIV>>Subject: RE: [Diy_efi] Venturi effect crankcase breather
<DIV></DIV>>Date: Wed, 9 Jul 2003 17:44:04 -0700 (PDT)
<DIV></DIV>>
<DIV></DIV>>--- Jack Vines <JACKV at AMBASSADORPROGRAMS.ORG>wrote:
<DIV></DIV>>
<DIV></DIV>> > Can you help me better understand what specific
<DIV></DIV>> > factors involved in pulling a vacuum in the
<DIV></DIV>> > crankcase cause the dramatic drop in engine life
<DIV></DIV>> > and which parts wear faster and why? Are we talking
<DIV></DIV>> > ring wear, bearing wear, piston skirt wear?
<DIV></DIV>>
<DIV></DIV>>As I was led to understand by the Harley engineer (who
<DIV></DIV>>is also a race engineer for several AMA Formula Xtreme
<DIV></DIV>>teams, I should also add), there was significant
<DIV></DIV>>additional ring wear once you got past a certain level
<DIV></DIV>>of depression in the crankcase. He didn't go into too
<DIV></DIV>>many details, but I suspect there may be bending of
<DIV></DIV>>the ring with fairly low pressures that cause the wear
<DIV></DIV>>to be concentrated on the upper edge of the ring face
<DIV></DIV>>(although this is merely supposition on my part).
<DIV></DIV>>
<DIV></DIV>>=====
<DIV></DIV>>| Adam Wade 1990 Kwak Zephyr 550 (Daphne) |
<DIV></DIV>>| "It was like an emergency ward after a great catastrophe; it |
<DIV></DIV>>| didn't matter what race or class the victims belonged to. |
<DIV></DIV>>| They were all given the same miracle drug, which was coffee. |
<DIV></DIV>>| The catastrophe in this case, of course, was that the sun |
<DIV></DIV>>| had come up again." -Kurt Vonnegut |
<DIV></DIV>>
<DIV></DIV>>__________________________________
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