Wouldn't an 'inlet upstream of the throttle plate' supply fresh,
filtered air? Something like this:
http://beesandgoats.com/boostfaq/stock_pcv.jpg
bs
Richard Ewald wrote:
> Actually modern cars do have completely sealed systems with no fresh
> air introduced into the system.
> On the cars I service there may or may not be a valve, but in either
> case there are two hoses from the crankcase. A small hose going to
> manifold vacuum, and a larger hose going to the inlet upstream of the
> throttle plate.
> the dipstick has an o-ring to seal it, and the oil cap is sealed.
> At idle, the small vac hose pulls a small vacuum in the crankcase.
> Not enough vacuum is pulled to draw air in past the crank/cam seals.
> At high load, the blow by is sucked out the large hose.
> Simple and works great. How it would adapt to a LBC I am not sure.
> Rick
>
> On Wed, Mar 17, 2010 at 2:00 PM, Bob Spidell <bspidell@comcast.net
> <mailto:bspidell@comcast.net>> wrote:
>
> 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
>
> --------------------------------
>
>
--
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Bob Spidell San Jose, CA bspidell@comcast.net
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