If you were to install a breather cap in place of the oil cap, the odds are your vehicle would notice a lean condition due to the PCV system drawing in un-metered 'fresh' air through the crankcase. There is no performance benefit to using one.
-Joe
I'm assuming that if you add a crankcase breather, you remove the PCV valve and plug the port in the intake manifold. Otherwise you would have a huge vacuum leak.
Nope, the PCV valve is left intact. There is no vacuum leak.
Are you using a breather that replaces the oil cap? I was thinking that it was a breather that would install in place of the PCV line coming out of the crankcase.
No. The breather replaces the hard plastic line from the passenger side valve cover that goes to the intake tube.
instead of putting it through the intake again and getting oil in your manifold, it just releases the gas into the atmosphere! (sp?)
Does the breather have a check valve? (i.e. Can air flow both directions through the breather, or just one way?)
I imagine that this mod plus plugging the erg valve would make some difference? Does anyone have this done also?
If I were to disconnect the Oil fill breather from the intake, should I plug it, install a filter, or install a one way valve?