Too much Crankcase ventalation?

[Mark R]

That is a healthy vaccuum.  Why keep the PCV valve setup?  Is running the
head ventilation though a catch can or charcoal filter, open to atmosphere
an option?

I'm not familiar with the PCV setup on the URQ, but generally the purpose of
a PCV valve is both ventilation, and emissions.  Catch can with a filter
would be approrpiate, IMHO.

Mark Rosenkrantz


On 9/4/07, Ben Swann <benswann at comcast.net> wrote:
>
> I am finally able to drive the Ur Quattro that has the new engine with
> Megasquirt - Yeah!.  Engine is balanced MC-1 with NF head.  I am now
> tuning
> it, so it will get better and better, but starting way rich, and trying to
> figure creative ways to tune since I don't have ready access to a
> dyno.  I'll
> probably need to have someone drive as I make changes to the VE tables,
> etc..
> Ideas?
>
>
>
> Anyway, after my first extended tuning session and the engine was on the
> warm
> side, I noticed a nasty squeal almost like a loose belt when the engine
> was
> idling.  I feared the worst as it seemed to be coming from the head and
> sounded a little like a metal machining noise, but went away when I gunned
> the
> engine.  Oil level was good - still on the Havalone break-in crap.
>
>
>
> I pulled the oil cap and the noise went away with a release of some
> serious
> vacuum.  I repeated this experiment only to conclude that there is so much
> vacuum on the head at idle, that it is probably evacuating the cam bearing
> or
> something to that effect.  If I left the cap loose, the noise did not come
> back, each time I tightened the oil cap, the noise cam back in a few
> seconds.
> I have the UrQ PVC hose setup, but so much is removed of the CIS stuff,
> there
> is fairly much a direct draw into the Intake manifold and the engine is
> pulling a good 18-20 lbs of vacuum at idle.
>
>
>
> So just seeing if there is any solution to this.  I would expect I should
> have
> some ventilation in the cam area, but this is too much.  Ideas?
>
>
>
> Ben
>
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