I disagree with racefan966. Eventually running without a pcv valve will cause oil and most importantly gas fumes to buildup within the crankcase because that is the job of a pcv valve, to remove and burn excess gas/oil fumes. Without a pcv valve, gas fumes will build up, which could one day not only dilute the engine oil causing lubrication problems, early bearing failure, etc. It could also cause the excessive crankcase pressure to blow out gaskets and may even one day lead to an explosion. Just suppose the engine would backfire for some other reason, with all them gasoline vapors floating around, it would make a bomb. The gasoline flowing through the engine oil may also lead to wiping the cylinder walls of oil causing premature ring failure, which would cause even more and more blowby and even more gas fumes building up.
So, to make a long story short, install a pcv in one valve cover and a breather cap on the other.
Saturday, October 5th, 2013 AT 8:11 AM