Thanks, these are good points. The throttle condition does not appear to
be an issue, in fact with the setup I've got this valve opens too much if
anything. I had thought of that while building the engine. I was going to
do an ejector for wide open throttle (Vizard calls it an evacusump or
something in his book), which plumbs PCV into the exhaust where the exhaust
pulls the vapors out of the system, but was talked out of it by David Anton
who suggested that the exhaust pressures in a street engine weren't high
enough to make it work, and that the amount of wide open throttle conditon
was brief enough (and followed by a lift off the throttle) so that I didn't
have to be too concerned. The dirty air stuff I didn't think about and
will correct. The engine is very tight right now with zero leaks, so I'm
reluctant to mess with it. The deadhead system was recommended to me by a
drag racer friend (he uses it with an ejector and picked up a few hp on the
dyno for reasons Vizard discusses), and it does appear to be effective for
oil control, but filtration is an issue that needs to be corrected.
We Tight,
Ron
----------
> From: Peter Samaroo <mrbugeye@hotmail.com>
> To: redlotus@spacey.net; ulix@u.washington.edu
> Cc: spridgets@autox.team.net
> Subject: Re: PCV Valve/Drippy 1275
> Date: Tuesday, December 15, 1998 4:19 PM
>
> Ulix,
> A couple of the disadvantages I see to no breather is under wide open
> throttle there is very little vacuum and maximum blowby if the
> restrictor in the pcv is too small you will be pressurizing the
> crankcase, and two under normal circumstances where there is vacuum in
> the crankcase air has to be coming from somewhere like the dipstick tube
> if there is no breather with a filter on it this will be unfiltered air.
> On new cars this filtering is done by the charcoal evap canister.
> Regards,
> Peter.
>
> >Date: Tue, 15 Dec 1998 09:17:30 -0800 (PST)
> >From: Ulix Goettsch <ulix@u.washington.edu>
> >To: Ron Soave <redlotus@spacey.net>
> >cc: spridgets@autox.team.net
> >Subject: Re: PCV Valve/Drippy 1275
> >Reply-To: Ulix Goettsch <ulix@u.washington.edu>
> >
> >Ron,
> >
> >what you say makes sense. It would be the best oil leak control. I
> tried
> >to come up with disadvantages, and could only think possibly more
> blowby.
> >
> >I think I'll try your way if I ever go to a Weber.
> >
> >Ulix
> >
> >On Mon, 14 Dec 1998, Ron Soave wrote:
> >
> >> I re-read what I wrote. Not quite right. My way is a dead-headed
> system,
> >> not a vacuum. Any pressure build up in the case from blowby, etc.
> results
> >> in flow. Common on new cars. I have to remember the proper sequence
> when
> >> I get home: Unwind with beer, then answer challenging e-mail.
> >>
> >> ----------
> >> > From: Ron Soave <redlotus@spacey.net>
> >> > To: Ulix Goettsch <ulix@u.washington.edu>
> >> > Cc: spridgets@autox.team.net
> >> > Subject: Re: PCV Valve/Drippy 1275
> >> > Date: Monday, December 14, 1998 4:42 PM
> >> >
> >> > It doesn't have to be. For the "tightest" oil control you would
> plug the
> >> > valve cover or do what I did putting the crankcase at a vacuum.
> You can
> >> > also put a filter on either the valve cover or the timing cover,
> putting
> >> > the crankcase at essentially atmospheric with some flow thru the
> system.
> >> I
> >> > went for maximum oil control, and figured I'd work my way towards
> >> > atmospheric from there.
> >> >
> >> > ----------
> >> > > From: Ulix Goettsch <ulix@u.washington.edu>
> >> > > To: Ron Soave <redlotus@spacey.net>
> >> > > Cc: Scott & Glenda Meyers <autox@earthlink.net>;
> >> spridgets@autox.team.net
> >> > > Subject: Re: PCV Valve/Drippy 1275
> >> > > Date: Monday, December 14, 1998 12:31 PM
> >> > >
> >> > > Ron,
> >> > >
> >> > > isn't the valve cover usually the INLET for the carankcase
> ventilation?
> >> > > Where is air entering your crancase? A vented oil cap?
> >> > >
> >> > > Ulix
> >> > >
> >> > > On Sun, 13 Dec 1998, Ron Soave wrote:
> >> > >
> >> > > > > For those of us who only 'kinda' paid attention to the other
> posts,
> >> > would
> >> > > > you
> >> > > > > mid sharing in some detail how you hooked this up to your
> 1275?
> >> > > >
> >> > > > Personally, I routed two hoses, one from the valve cover spigot
> and
> >> one
> >> > > > from the timing cover into a "Y" fitting. The "y" is then
> routed
> >> into
> >> > the
> >> > > > valve, which I am using inline in heater hose (it is not an
> inline
> >> > valve,
> >> > > > I'm just using it that way, it has pipe thread on one end, and
> a hose
> >> > bead
> >> > > > on the other, 1/4 inch or 3/8 if memory serves, and it'll have
> to
> >> serve
> >> > > > since I'm too lazy to walk 9 feet to the garage). From the PCV
> >> valve,
> >> > it's
> >> > > > more heater hose into a 1/4" pipe-to-hose adapter fitting (90
> angle)
> >> > into
> >> > > > the intake of my Cannon manifold (no hole provided on the
> intake,
> >> just
> >> > a
> >> > > > flat; drill and tap it yourself). I did it this way for max
> PCV, and
> >> > > > routed it for esthetics. It is very low profile, and I wire
> brushed
> >> > and
> >> > > > clearcoted all the fittings to give a polished look. Actually
> on my
> >> > car, I
> >> > > > was pulling a bit too much vacuum with this valve on throttle
> lift,
> >> and
> >> > was
> >> > > > seeing puffs of smoke, never on power or under load, just at
> "vacuum"
> >> > > > situations. I feared it was guides (although they are new),
> but
> >> > jetting
> >> > > > down the PCV with orifices has worked well.
> >> > > >
> >> > >
> >> > > Ulix
> __/__,__
> >>
> >> >
> >> > > ..........................................................
> >> (_o____o_)....
> >> > > '67
> Sprite
> >> > >
> >>
> >
> > Ulix __/__,__
> >..........................................................
> (_o____o_)....
> > '67 Sprite
> >
> >
>
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
|