Fine... when the Civic came out in 1972, there was this metal thing called the cam spinning inside of this metal cover called a valve cover. At certain RPMs, this created a real weird "electronic drone" (electrical noise) sound that could he heard through the cheap ass wiring of the speakers, sometimes even when the radio wasn't on. (I forget the technical name of the phenomena when you spin a metal core at high rpms inside of a metal surround --- but it has its own special name) - it produces current (possibly... under certain circumstances) and electrical noise (definitely).
Fast forward to today... we have solid state electronics and shielded wiring, so you think that you could remove it right? Wrong.
Your valve cover "technically" isn't grounded to the block/chassis due to the rubber grometts/seals, and also the paper head gasket between the head and the block... it's isolated (this is arguable, but I won't get into that).
In short --- w/ todays HiPo shielding and super cool solid state electronics you can remove it --- but Honda seems to still think that the VC is isolated (or somewhat isolated) and you need it.
Some run it - some do not.
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Originally Posted by BABY J
