In this case, 'closed' doesn't mean 'sealed.' It means the system is
continuous, with an intake--the filter--and an output--the PCV valve
into the manifold. That's how OEM PCV systems work (see:
*http://tinyurl.com/yajrlzb )*. To truly breathe, you need an inlet
vent (the 'V' in PCV is for 'ventilation'). Ever try pouring gas from a
can without opening the vent hole? Pulling a significant vacuum means
you're not circulating the gases--the intent of a PCV system.
This setup does work well as is, however (I have it on my BJ8).
bs
Alan Bromfield wrote:
> FWIW the PCV fitting as described is definitely a truly closed system.
> The vacuum can definitely be felt when you open the oil filler cap or
> lift the dipstick off the sealing washer. Also when air is admitted in
> that way, engine revs increase slightly as the air gets drawn into the
> crankcase or rocker box and then imto the inlet manifold.
>
> I am surprised that this mod hasn't been adopted more widely. It is a
> major contribution to solving oil incontinence in our 'mature'
> engines.
>
> On 17 March 2010 13:21, 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
>>
>>
*******************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
*******************************************************************
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