Hi Michael,
If you mean the non-vented approach pulls more vacuum on the crankcase I agree.
But, you're pulling unfiltered air in through other gaps (like around the
crankcase seal).
The 'sealed' PCV system works good on our cars, but it's not a PCV 'system' per
se. A proper PCV system circulates filtered air through the crankcase, mixes it
with blowby and sends it back through the intake manifold.
bs
--------------------------------
Bob Spidell - San Jose, CA
----- Original Message -----
From: "Michael Salter" <msalter@precisionsportscar.com>
To: "Bob Spidell" <bspidell@comcast.net>
Cc: "Healey" <Healeys@autox.team.net>
Sent: Wednesday, March 17, 2010 12:29:12 PM GMT -08:00 US/Canada Pacific
Subject: Re: [Healeys] crank case ventilation
Hi Bob,
By installing an air intake filter on the valve cover you will be missing out
on one great advantage of a PCV system for a Healey engine.
A PCV system partially evacuates the crankcase and, in so doing, eliminates the
flow of oil laden air through the rear main seal. I had a hidden PCV system on
my BJ8 many years ago and it completely stopped a substantial rear main seal
leak that was caused by wear on the crankshaft scroll surface.
On Thu, Mar 18, 2010 at 2:21 AM, Bob Spidell < bspidell@comcast.net > wrote:
That type/size filter is usually used on a PCV-fitted car as an intake filter
on a valve cover.
One possible problem with the PCV retrofit on a Healey is the PCV valve is
usually fitted to draw gases through the 'T' fitting on the valve cover. An
exactly correct PCV installation would have the T fitting removed and something
like this on the valve cover so air would be drawn in through the valve cover
and gases--including blowby and air from inside the valve cover that gets
pulled down the pushrod holes--to be sucked into the intake manifold (i.e. a
truly closed system).
I've considered this for my car but haven't tried it.
bs
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