If the engine is tightly sealed, and the PCV valve allows too much manifold
vacuum into the engine you can pull air in via the seals. Sometimes a
whistle, sometime a chicken type noise (buck, buck, buck).
I would try a different valve, and if that does not work, play around
different part numbers to find one that has a lower flow.
Rick
On Mon, Mar 26, 2012 at 6:58 AM, Alan Bromfield <bluehealey at gmail.com>wrote:
> Thanks Kees.
> No, the valve is plumbed in at the tee piece on top of the rocker box
> and connects to the inlet using the tapping to back of the inlet
> manifold. The whistling noise is definitely from the front of the
> engine and only when there is a high vacuum. I have a Monza style
> filler on the rocker cover on which I have blocked the breather hole
> as Norman recommends. When the filler is open (no vacuum) then the
> whistle stops. Also if I pull the dip stick, allowing air in that way,
> the whistle also clears.
>
> On 26/03/2012, Oudesluys <coudesluijs at chello.nl> wrote:
> > It is not the valve itself that makes a whistling noise?
> > Kees Oudesluijs
> >
> >
> --
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