[Healeys] PVC value question

[Bob Spidell]

Because you need manifold vacuum to operate a PCV valve properly.  There's little vacuum to speak of upstream of the 
throttle plates.  If you did this, the PCV valve would likely only serve to somewhat block ventilation of the 
crankcase--you'd pressurize the crankcase and get oil leaks from around the valve cover and elsewhere (this happened to 
me when I tried an aftermarket filter that had a too-narrow blowby vent tube).

Bob


On 12/15/2012 4:16 PM, john spaur wrote:
> An article on John Sim's website shows the installation of a PVC valve. However, the vacuum source is from the intake 
> manifold on the front carburetor for a tri-carb.
>
> Why can't the vacuum source come from the rear carb air filter where the existing crankcase ventilation hose connects?
>
> Thank you,
>
> John Spaur
> '62 BT7
> _______________________________________________
>
>
>


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Bob Spidell           San Jose, CA            bspidell at comcast.net

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