[Diy_efi] Venturi effect crankcase breather

[arnie]

----- Original Message -----
From: "arnie" <arnie_ at charter.net>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Wednesday, July 09, 2003 8:21 AM
Subject: Re: [Diy_efi] Venturi effect crankcase breather


>
> ----- Original Message -----
> From: "Adam Wade" <espresso_doppio at yahoo.com>
> To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
> Sent: Tuesday, July 08, 2003 11:51 PM
> Subject: Re: [Diy_efi] Venturi effect crankcase breather
>
>
> > --- Djfreggens at aol.com wrote:
> >
> > Do you mean using a second ring with a wider gap in it?  That
> > doesn't make much sense to me.  You just defeated the purpose
> > of having the ring there in the first place.
>
> OEM (as well as aftermarket) has been prescribing (and using)
> larger gapped second rings for a decade that I am aware of.  This
> aids in the compression sealing of the top ring, by preventing
> pressure buildup below top compression ring.

This is why the gapless second ring designs are (AFAIC) flawed engineering.
The design puts the compression sealing responsibility
on the wrong ring, and defeats the purpose of the top ring by
actually diminishing it's effectiveness.   :shrug:
>
> > > the thing you are trying to releave is the boundry
> > > layer gases that bascially cuase ring fluter at high
> > > rpm.
> >
> > And here I thought it was because of the resonant
> > frequency of the ring.  Silly me.



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