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Old 05-06-2008, 08:58 PM   #11
Scooby Guru
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Join Date: Jun 2006
Chapter/Region: MWSOC
Location: North Dakota
2015 WRX Limitec


Originally Posted by magnum2066 View Post
When the oil cap is on the engine is constantly creating a vacuum, which could be like saying the engine is "pulling itself", which creates a constant vacuum. You may notice on some high-powered Chevy motors that the valve covers have breathers (usually have K&N style filters on top of them.)
my 1.9L ford escort had exactly that. It came factory with a line plumbed into the intact tract behind the filter, and was replaced along the way with a mini k&n style filter. (held on by hose clamps, it wasn't moving!)
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