[Diy_efi] Venturi effect crankcase breather
efi student
efi.student at sbcglobal.net
Thu Jul 10 07:38:12 GMT 2003
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No, it dramatically increases the blowby and can actually cause seal
failures on some engines when the crankcase pressure goes positive.
Lance
-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Zenon Two
Sent: Wednesday, July 09, 2003 8:55 PM
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] Venturi effect crankcase breather
does increasing manifold pressure (via forced induction) have the same
effects as decreasing crankcase pressure?
From: Adam Wade
>Reply-To: List for general do-it-yourself EFI talk
>To: List for general do-it-yourself EFI talk
>Subject: RE: [Diy_efi] Venturi effect crankcase breather
>Date: Wed, 9 Jul 2003 17:44:04 -0700 (PDT)
>
>--- Jack Vines wrote:
>
> > Can you help me better understand what specific
> > factors involved in pulling a vacuum in the
> > crankcase cause the dramatic drop in engine life
> > and which parts wear faster and why? Are we talking
> > ring wear, bearing wear, piston skirt wear?
>
>As I was led to understand by the Harley engineer (who
>is also a race engineer for several AMA Formula Xtreme
>teams, I should also add), there was significant
>additional ring wear once you got past a certain level
>of depression in the crankcase. He didn't go into too
>many details, but I suspect there may be bending of
>the ring with fairly low pressures that cause the wear
>to be concentrated on the upper edge of the ring face
>(although this is merely supposition on my part).
>
>=====
>| Adam Wade 1990 Kwak Zephyr 550 (Daphne) |
>| "It was like an emergency ward after a great catastrophe; it |
>| didn't matter what race or class the victims belonged to. |
>| They were all given the same miracle drug, which was coffee. |
>| The catastrophe in this case, of course, was that the sun |
>| had come up again." -Kurt Vonnegut |
>
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<DIV><SPAN class=3D939372507-10072003><FONT face=3DArial size=3D2>No, it =
dramatically=20
increases the blowby and can actually cause seal failures on some =
engines when=20
the crankcase pressure goes positive.</FONT></SPAN></DIV>
<DIV><SPAN class=3D939372507-10072003><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D939372507-10072003><FONT face=3DArial=20
size=3D2>Lance</FONT></SPAN></DIV>
<DIV><SPAN class=3D939372507-10072003></SPAN> </DIV>
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> =
diy_efi-bounces at diy-efi.org=20
[mailto:diy_efi-bounces at diy-efi.org] <B>On Behalf Of </B>Zenon=20
Two<BR><B>Sent:</B> Wednesday, July 09, 2003 8:55 PM<BR><B>To:</B>=20
diy_efi at diy-efi.org<BR><B>Subject:</B> RE: [Diy_efi] Venturi effect =
crankcase=20
breather<BR><BR></FONT></DIV>
<DIV>
<DIV>
<P>does increasing manifold pressure (via forced induction) have the =
same=20
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=20
<DIY_EFI at DIY-EFI.ORG>
<DIV></DIV>>To: List for general do-it-yourself EFI talk=20
<DIY_EFI at DIY-EFI.ORG>
<DIV></DIV>>Subject: RE: [Diy_efi] Venturi effect crankcase breather=20
<DIV></DIV>>Date: Wed, 9 Jul 2003 17:44:04 -0700 (PDT)=20
<DIV></DIV>>=20
<DIV></DIV>>--- Jack Vines <JACKV at AMBASSADORPROGRAMS.ORG>wrote:=20
<DIV></DIV>>=20
<DIV></DIV>> > Can you help me better understand what specific=20
<DIV></DIV>> > factors involved in pulling a vacuum in the=20
<DIV></DIV>> > crankcase cause the dramatic drop in engine life=20
<DIV></DIV>> > and which parts wear faster and why? Are we talking =
<DIV></DIV>> > ring wear, bearing wear, piston skirt wear?=20
<DIV></DIV>>=20
<DIV></DIV>>As I was led to understand by the Harley engineer (who=20
<DIV></DIV>>is also a race engineer for several AMA Formula Xtreme=20
<DIV></DIV>>teams, I should also add), there was significant=20
<DIV></DIV>>additional ring wear once you got past a certain level=20
<DIV></DIV>>of depression in the crankcase. He didn't go into too=20
<DIV></DIV>>many details, but I suspect there may be bending of=20
<DIV></DIV>>the ring with fairly low pressures that cause the wear=20
<DIV></DIV>>to be concentrated on the upper edge of the ring face=20
<DIV></DIV>>(although this is merely supposition on my part).=20
<DIV></DIV>>=20
<DIV></DIV>>=3D=3D=3D=3D=3D=20
<DIV></DIV>>| Adam Wade 1990 Kwak Zephyr 550 (Daphne) |=20
<DIV></DIV>>| "It was like an emergency ward after a great =
catastrophe; it |=20
<DIV></DIV>>| didn't matter what race or class the victims belonged =
to. |=20
<DIV></DIV>>| They were all given the same miracle drug, which was =
coffee. |=20
<DIV></DIV>>| The catastrophe in this case, of course, was that the =
sun |=20
<DIV></DIV>>| had come up again." -Kurt Vonnegut |=20
<DIV></DIV>>=20
<DIV></DIV>>__________________________________=20
<DIV></DIV>>Do you Yahoo!?=20
<DIV></DIV>>SBC Yahoo! DSL - Now only $29.95 per month!=20
<DIV></DIV>>http://sbc.yahoo.com=20
<DIV></DIV>>=20
<DIV></DIV>>_______________________________________________=20
<DIV></DIV>>Diy_efi mailing list=20
<DIV></DIV>>Diy_efi at diy-efi.org=20
<DIV></DIV>>http://www.diy-efi.org/mailman/listinfo/diy_efi=20
<DIV></DIV></DIV><BR clear=3Dall>
<HR>
Help STOP SPAM with <A href=3D"http://g.msn.com/8HMUEN/2731??PS=3D">the =
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