[Shotimes] Engine Vacuum

[Carl Prochilo]

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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