re: "the original reason for Positive Crankcase Ventilation was to improve
emissions by recycling crankcase gasses back
to the intake to "re-burn" them. Is this true?"
Yes. Most are a 'passive' system, using engine vacuum, but I believe some
cars actually had a source of positive
pressure to push the gasses through the system.
re: "It seems to me that the Healey already has a primitive form of PCV."
No. It simply dumps into the air filter instead of onto the road. Nothing
'positive' (or active) about it.
re: "Isn't the existing Healey crankcase vent system already pulling a slight
negative pressure in the crankcase & valve
cover?"
I don't believe so. All cars have some blow-by, which pressurizes the
crankcase.
re: "So what is the gain by adding this to a Healey?"
I put one in so I could run K&N air filters (couldn't figure out a clean way to
run the crankcase vent into the filter).
After installing the PCV, I noticed oil consumption was down, the 'wet spot'
was smaller and I didn't get as much smoke.
Bob
On 2/1/2012 6:15 AM, warthodson@aol.com wrote:
> I always thought the original reason for Positive Crankcase Ventilation was
>to improve emissions by recycling
> crankcase gasses back to the intake to "re-burn" them. Is this true?
> It seems to me that the Healey already has a primitive form of PCV. So what
>is the gain by adding this to a Healey?
> Isn't the existing Healey crankcase vent system already pulling a slight
>negative pressure in the crankcase & valve cover?
> Gary Hodson
>
>
>
--
*******************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
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