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Re: Breathers

To: <kturk@ala.net>, <land-speed@autox.team.net>
Subject: Re: Breathers
From: "Jim Dincau" <jdincau@qnet.com>
Date: Mon, 15 Jan 2001 16:04:44 -0800
Hi Keith,
     That was why I was asking. This is not for the modified, that thing
develops a ton of pan pressure if we lose a ring seal or a piston. There is
no way a scavenge pump can keep ahead of the PSI running 50% over. I was
asking about what I ought to do for the unblown four cyl. I am building for
the street roadster.
Jim


----- Original Message -----
From: Keith Turk <kturk@ala.net>
To: Skip & Joyce Higginbotham <saltrat@pro-blend.com>; Jim Dincau
<jdincau@qnet.com>; <land-speed@autox.team.net>
Sent: Monday, January 15, 2001 1:18 PM
Subject: Re: Breathers


> Jim ... I kinda had a question along the same lines...
>
> If one of the advantages of a Drysump is that it develops a Vacuum to aid
> in sealing the rings... why would I vent the Valve covers to the Outside
> atmosphere...
>
> We do some Vacuuming in our business here... and I know it doesn't take
> much of an air leak to decrease vacuum to atmospheric Pressure...
>
> Just a curious thought.... K
>
> ----------
> > From: Skip & Joyce Higginbotham <saltrat@pro-blend.com>
> > To: Jim Dincau <jdincau@qnet.com>; land-speed@autox.team.net
> > Subject: Re: Breathers
> > Date: Monday, January 15, 2001 3:11 PM
> >
> > Hi Jim,
> > The tank vent will probably be enough unless you hole a
> > piston......then......??????
> > We run rocker cover vents.....open to the atmosphere. Might be on the
> safe
> > side and use both?
> > Skip H
> >
> >
> >
> >
> >
> >
> >
> > At 12:17 PM 1/15/01 , you wrote:
> > >Hi all, another poll,
> > >     On the modified (blown/fuel), because of past experience with
> torching
> > >pistons, we run two number 12 lines direct to atmosphere from the valve
> > >covers. I know this isn't the most environmentally friendly thing to do
> but
> > >we have ballooned oil pans and catch tanks before and they are
expensive
> to
> > >replace.
> > >      On unblown gas dry sump engine, will a two scavenge stage pump
> pull
> > >enough vacuum to allow venting the tank only? If additional vents are
> > >required is the rocker can or the tappet chamber a better place to
vent?
> > >Jim in Palmdale where it has actually rained an inch this month

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