[Shotimes] Engine Vacuum

[Robert Bruce]

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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