What's wrong with cheap PCV valves? I remember reading here that they should not be used.
In theory if it fits tight and works at standard vacuum it should be fine. Healthy engines at idle all create 15-20 Hg of vacuum, at
2000 rpm 19-21 Hg of vacuum, and at full throttle near 0 vacuum. A healthy decelerating engine jumps to 21-27 Hg as the throttle is released. Or so it says in my vacuum guage instructions. The package of a cheap Canadian Tire valve says "The postive crankcase valve uses engine vacuum to pull harmfull vapours out of the crankcase and return them to the carburetor, where they are reburned in the cylinders". (That's harmful to the environment, not the engine, I assume.) Does a PCV value have to be more sensitive than the vacuum guage numbers suggest, and therefore specific to the make and model of vehicle?Or is the objection that they do not last as long? The one I looked at today says it "meets or exceeds original equipment performance specifications". Those specs might not say anything about durability. The package says to replace the valve every year or 20k km, about 12k miles.
--
------------------------------------------------------------------------------ William R Watt National Capital FreeNet Ottawa's free community network homepage: