cam cover blowby flow and crankcase pressure, tiny hole modification - Page 5 - Miata Turbo Forum -Boost cars, acquire cats.

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Old 01-09-2015, 08:17 PM   #81
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Originally Posted by MSMjohn View Post
Scotch-Brite is abrasive. If oil get into the Scotch-Brite & loosens the abrasive grit from the fibers, then drains onto the oil, abrasive grit will get in the oil & wear out all the close tolerance parts causing severe damage. I would remove the Scotch-Brite as soon as possible.
Thanks John. This engine was "Night of the Living Dead" before the Scotch Brite was added, so no harm no foul. I ended up using stainless scrubber material on a different valve cover.

Since this episode I've spoken at the track with a couple of guys who have lots of experience with this issue. More than the scrubber material, the larger hole helps.

The biggest thing you can do is make sure that the stock baffles are sealed so that they work properly. I also re-installed my PCV valve and run either a catch can out the vent or a mini K&N breather. My newly-built engine with these changes has NONE of the issues and none of the blow-by of the old engine...mainly because it's not a tired old engine with crap rings.
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