[Shotimes] Engine Vacuum

Sat, 19 Jun 2004 19:39:40 -0500

I don't think anything I do is generally accepted.......

Paul Nimz
'97 TR
'93 EG mtx

----- Original Message ----- 
From: "Carl Prochilo" <gr8sho@prochilo.myserver.org>
To: <shotimes@autox.team.net>
Sent: Saturday, June 19, 2004 7:20 PM
Subject: Re: [Shotimes] Engine Vacuum

> Apparently I misunderstood your previous post where you suggested plugging
> the hose from the TB to the front valve cover.  Is this a generally
> accepted change to most V6 SHOs?
> -- 
> Cheers,
> Carl Prochilo
> 92 Ultra Red Crimson
>
> On Sat, June 19, 2004 4:23 pm, Paul Nimz said:
> > Yes I don't defeat the PCV system.  I only stop the air from coming in.
> > There still is blowby and this will be drawn out by the vacuum.  There
is
> > just much less water vapor and actual blowby on a healthy engine when
the
> > crankcase is under a vacuum.  And the lighter, more volatile
contaminates
> > will quickly be boiled off and exhausted from the crankcase.
> >
> > The V6 all I can get is around 2" with the venturi type vacuum
generation
> > in
> > the TB.  On the V8 with the normal PCV valve I can get near 10" at
> > cruising
> > speeds.  I tried to connect a typical PCV valve to my V6 motor once but
> > got
> > quite a bit of whistling through the TB.  Probably from one of the three
> > PCV
> > venturi ports.
> >
> > Paul Nimz
> > '97 TR
> > '93 EG mtx
> >
> >
> > ----- Original Message -----
> > From: "Robert Bruce" <rbruce@bellatlantic.net>
> > To: <shotimes@autox.team.net>
> > Sent: Saturday, June 19, 2004 3:01 PM
> > Subject: RE: [Shotimes] Engine Vacuum
> >
> >
> >> I wouldn't want to defeat the PCV system.  That could lead to engine
> >> leaks
> >> at the f & r main seals, valve covers, cam seals, plug well gaskets,
> >> etc.
> >> You need you maintain a vacuum on the crankcase in order for the main
> > seals
> >> and cam seals to work properly.
> >>
> >> A fluid separator in the PCV system would be beneficial.  It helps
> >> reduce
> >> the varnish buildup in the intake that is common with the SHOs.  Paul
> >> Nimz
> >> and I both run versions of a separator.  Maybe a few others use it as
> > well.
> >>
> >> Actually a high vacuum in the crankcase increases hp a couple of ways.
> > Oil
> >> droplets and mist can't stay suspended in the air of the crankcase
under
> > the
> >> high vacuum conditions.  Therefore the oil tends to fall off the rods
> >> and
> >> crank, then drain back to the pan quickly.  If there is less oil
> >> sticking
> > to
> >> the rods and crank, then there is now less rotating weight.  The second
> > way
> >> a high vacuum helps is it's effect on helping the piston rings seals
> > better
> >> under heavy loads.
> >>
> >> Robert Bruce
> >> 93 atx street
> >> 92 track
> >>
> >>
> >> -----Original Message-----
> >> From: shotimes-admin@autox.team.net
> >> [mailto:shotimes-admin@autox.team.net]On Behalf Of Carl Prochilo
> >> Sent: Saturday, June 19, 2004 1:53 PM
> >> To: shotimes@autox.team.net
> >> Subject: [Shotimes] Engine Vacuum
> >>
> >>
> >> Why is this subject important?  Looking for a primer type dissertation.
> >> I've already heard that the PCV system should be defeated...
> >> --
> >> Thanks and Cheers,
> >> Carl Prochilo
> >> 92 Ultra Red Crimson
> >>
> >> On Sat, June 19, 2004 1:41 pm, Alan Fanning said:
> >> > FWIW, I recently tested several SHO's for engine vacuum at a group
> >> > get-together. I saw a steady 25 inches as a typical reading on a
stock
> >> > SHO.
> >> > On my engine with Stage 1 cams I was down to about 15 inches, but
> >> still
> >> > steady.  If the needle is flopping all over you have problems, but I
> > don;t
> >> > recall the details.
> >> >
> >> >     Alan
> >> >
> >> >> From: "Kevin & Cheryl Airth" <clubairth@peoplepc.com>
> >> >> To: "Paul Nimz" <pnimz@v8sho.com>, <cmichaelo@optonline.net>
> >> >> Cc: "shotimes" <shotimes@autox.team.net>
> >> >> Subject: Re: RE: [Shotimes] What can destroy a cat?
> >> >> Date: Sat, 19 Jun 2004 12:12:21 -0500
> >> >>
> >> >> Thanks Paul!!
> >> >> I had forgot about using a vacuum gauge. Here is why. Have you
> > attempted
> >> >> this? I have found the vacuum gauge and it's actions are so wide
open
> > to
> >> >> interpretation that everyone who looked at the readings came up with
> >> a
> >> >> different answer!! I think vacuum tests would be more useful if we
> > could
> >> >> some how get a baseline for each engine. Maybe with 2 SHO's side by
> > side
> >> >> and
> >> >> using the same gauge and the same tests. That might give you a leg
up
> > on
> >> >> what is actually happening inside the engine. You do mention
> >> something
> >> >> that
> >> >> may have messed up my experiences. My vacuum gauge does NOT have the
> >> >> gauge
> >> >> damper control. I have not seen one with it? Maybe my gauge is a
> >> cheap
> >> >> one
> >> >> but the damper adjustment would put another variable in the system
> >> that
> >> >> has
> >> >> too many already?
> >> >> .
> >> >> .
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