Trevor said:
> The top of the PCV valve has a tiny hole that opens
>the top of the diaphragm to atmosphere. This provides
>a reference to deside if the crankcase pressure is
>positive.
I was thinking that that tiny hole was there to allow the air on the top of
the diaphram to escape (or be pulled in) so that the diaphram could move
freely, instead of compressing the air on top or creating a vacuum on top.
Robert D.
-----Original Message-----
From: Trevor Boicey <tboicey@brit.ca>
To: Robert Duquette <RobertDuquette@Sympatico.ca>
Cc: Spridgets <spridgets@autox.team.net>
Date: July 2, 1999 1:08 AM
Subject: Re: P.C.V. ( LBC content :) )
>Robert Duquette wrote:
>> So, all this to ask how the PCV really works.
>>
>> Here are my thoughts:
>
> This doesn't quite agree with my line of thinking,
>but again this is only my observation.
>
> The top of the PCV valve has a tiny hole that opens
>the top of the diaphragm to atmosphere. This provides
>a reference to deside if the crankcase pressure is
>positive.
>
> The crank pressure is applied to the bottom of the
>diaphragm, where it is "compared" to the atmospheric
>at the top.
>
> If the crankcase pressure is positive, it
>lifts the diaphragm. This lifts the bullet-like
>cylinder out of the intake tube, opening a pathway
>up to allow it to flow into the manifold.
>
> So essentially, if crankcase pressure is positive
>compared to atmosphere, it vents into the intake.
>
>--
>Trevor Boicey, P. Eng.
>Ottawa, Canada, tboicey@brit.ca
>ICQ #17432933 http://www.brit.ca/~tboicey/
>"Was Casper truly as friendly as they say?" - Ajax
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