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Opinions on Valve cover Oil breather. Come on in

9852 Views 20 Replies 8 Participants Last post by  6speeder
So after I had the porous block/main seal repair work. My dealership questioned the crankcase pressure. I completely discounted that comment by telling them my PCV tubing, intake plenum were completely dry. I also advised them that I had a catch can installed for approximately 2000 miles and collected not a drop of oil. If the leak were associated with increased crank case pressure, I would have oil in the pcv tubes etc. We agreed on that.

I started to research the pros and cons of a valve cover breather and thought I would try one. I know it will not improve performance but if it will help the existing PCV system reduce pressure, it may be a good thing. I found a Metco breather and installed it along with the existing PCV system. I took a spirited after the install drive and there was no cabin odor, or oil mist collecting on the valve covers and no leak.


Here is the product:

Here is the install photo. I opted to install it in the plastic fill tube although it can also be installed directly into the valve cover.

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You won't really decrease crankcase pressure at all with the breather. Rather, you will just vent it to the atmosphere instead of back into the intake which is a good thing. Like baabootoo said, it was removed in the 60/70's from cars so that we would not be venting these oil fumes and other gases directly into the air. In doing this you will keep some heat out of the intake but better yet, any engine oil from being introduced into the cylinders above the rings. A big issue with introducing oil is that not only does it gum stuff up and interfere with the combustion process of gasoline/ethanol as these engines were designed, it also lowers octane level as oil has a lower rating. See you are a genius.

Did I hear that you run 100 octane 100% of the time?
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