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79 Posts
A few things that have been bugging me. Thanks.
1) Is a PCV valve *itself* just a glorified "check valve" ? I understand the part about letting crankcase gases into the intake, via the PCV and the hose... but as far as the actual valve itself, it has no job to do other than let vacuum through one way but not boost the other way. Is that right?
1.1) If yes to 1, then is there any PCV valve, for any car/year/I don't care, which incorporates a small spring to keep it normally "closed", up to say 1 or 2 lbs/in ?
2) If vapors are being slurped FROM the crankcase, then it stands to reason that vapors must be going INTO the crankcase at some other place. It just stands to reason. So where exactly is fresh air coming INTO the crankcase?
3) At the sucking side of the PCV valve, the vacuum is split between the crankcase and a tube going down to the DIRTY SIDE of the airbox, where there's a little place for a gimmicky filter to be crammed into a hole just for the PCV intake. Why didn't they just connect that tube to the CLEAN side of the airbox and cut through the madness?
1) Is a PCV valve *itself* just a glorified "check valve" ? I understand the part about letting crankcase gases into the intake, via the PCV and the hose... but as far as the actual valve itself, it has no job to do other than let vacuum through one way but not boost the other way. Is that right?
1.1) If yes to 1, then is there any PCV valve, for any car/year/I don't care, which incorporates a small spring to keep it normally "closed", up to say 1 or 2 lbs/in ?
2) If vapors are being slurped FROM the crankcase, then it stands to reason that vapors must be going INTO the crankcase at some other place. It just stands to reason. So where exactly is fresh air coming INTO the crankcase?
3) At the sucking side of the PCV valve, the vacuum is split between the crankcase and a tube going down to the DIRTY SIDE of the airbox, where there's a little place for a gimmicky filter to be crammed into a hole just for the PCV intake. Why didn't they just connect that tube to the CLEAN side of the airbox and cut through the madness?