Engine Valve Cover Vent Hose Necessary?

Discussion in '1994 - 1995 Specific Tech' started by dstang01, Jul 2, 2012.

  1. Hey folks, doing a head swap and my new valve covers don't have a fill neck with a nipple for the vent hose. Should I look for a cap with a hose or would I be fine deleting it? Doesn't the PCV take care of venting?
  2. The PCV valve is where it goes out of the crank case, you need a vent for fresh air to come in. It doesn't have to be a hose, you can use a breather cap.

  3. Thanks, I picked up something like this from the parts store and it should work!

  4. Does that have a breather element in it, or is it just a baffle? If there is no breather filter inside of it, that nipple has to be connected with a hose back to the intake.

  5. You might also want to take metered air into consideration if you don't keep the system closed..........
  6. I know this is a technicality that is a correct consideration, but in all honesty I've never seen it be enough air to make any difference.

  7. It's baffled and I ran 1/2" heater hose from it to the nipple on the intake, still a closed system. It actually looks great with classic chrome valve covers :)
  8. Really. That's like a big vacuum leak. I wouldn't be surprised if many surging idle issues are caused by adding unmetered air into the equation.
  9. I would tend to agree with you given the size of the hole in the PCV valve, but I've never seen it make a difference.

  10. un-metered air is always bad business from what I have seen. But maybe its not enough to cause issues.