RE: RE: Valve cover vent questions

From: Bernd D. Ratsch (fasstdak@hotmail.com)
Date: Mon Jun 07 2004 - 15:43:08 EDT


Remember, the airhat is under vacuum when running - it works both ways - at
engine-off, the gases also will move into the airhat. PCV does most of the
work though.

- Bernd

-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bob Tom
Sent: Monday, June 07, 2004 8:26 AM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: RE: Valve cover vent questions

At 02:55 AM 6/6/04, Bernd wrote:
>The vent tube it to allow excess oil vapor (which the PCV hasn't take
>care
>of) and "re-burn" it with fresh air - part of emissions.

That's not quite my understanding on how this system works.

The pcv valve on the pass. side valve cover is "the vacuum source" for the
crankcase ventilation system in that vacuum in the intake manifold
determines when the valve opens and closes. The valve, itself, is the
metering device.

The hose that runs from the driver's side "breather" to the air filter
casing is the "filtered air source". Clean air is pulled from the filtered
side
of the
air filter housing through crankcase and then up through the PCV valve and
then into the intake manifold for burning as the engine runs.

>-----Original Message-----
>Also with my new airhat on the way, I am debating on whether or not to
>put a breather on the valve cover or plumb the hose back to the airhat
>(it's stock location). Suggestions? Pros or cons? While on the subject,
what is the
>purpose of the vent hose? TIA! Val Garcia

If there is any difference in changing from the stock hose connection to
the air
filter box to a push-in "breather" on the valve cover (e.g. a K&N breather),
it is only in the quality of the filtered air source. Naturally, a poor
filter or filter
seal will contaminate your engine oil directly.

If there's any failure or clogging at either end of the system (pcv valve or
breather), it can cause heavy engine sludging, poor engine performance and
stalling.

Bob



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