Re: Effects of no PCV valve
[Re: moparmikethree]
#746336
07/12/10 12:55 PM
07/12/10 12:55 PM
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Joined: Nov 2004
Posts: 9,312 SoCal
68HemiB
master
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master
Joined: Nov 2004
Posts: 9,312
SoCal
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Positive Crankcase Ventilation is not simply a "smog device", it is a good thing for total engine health. Removing blow-by, condensation, and the like with a PCV system will result in a much healthier engine than any passive breather or road-draft tube will accomplish.
A proper "type IV" system will include two lines connecting to the crankcase. One will be to manifold vacuum, and will contain the PCV valve proper. The other will be the fresh air supply. Ideally, it will pull from inside the area contained by the air filter (to provide a filtered fresh air source), and will have a small dedicated screen-type filter.
During normal operation, a small amount of crankcase air (and any excess pressure) will be drawn through the PCV valve into the intake manifold to be burned in the engine. The air will be replaced by the fresh air side. During unusual periods of low vacuum and/or excessive blow-by, the fresh air line can handle the excess load, and flow "backwards" into the carb to be burned by the engine.
Down to just a blue car now.
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Re: Effects of no PCV valve
[Re: Stanton]
#746342
07/12/10 03:25 PM
07/12/10 03:25 PM
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Joined: Jun 2003
Posts: 21,429 It's a dry heat
gtx6970
Too Many Posts
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Too Many Posts
Joined: Jun 2003
Posts: 21,429
It's a dry heat
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Quote:
Had nothing to do with emissions what-so-ever. PCV valves were around long before emissions regs.
sorry, but this is not entirely true.
PCV was/is the 1st real attempt at emissions regulations. It's designed to draw unburned fuel vapors and crankcase/combustion gases byproducts to be re-burned in the engine and not allow them to be vented/escape into the atmosphere
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Re: Effects of no PCV valve
[Re: gtx6970]
#746343
07/12/10 03:31 PM
07/12/10 03:31 PM
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Joined: Jan 2003
Posts: 21,072 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,072
Niles , Ohio
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GTX is correct.It was one of the first attempts at emissions.Ive run 2 breatgers on my 440 for probally 20 years.My kid does the same on his never been apart 413 in his 62 300.The 360 in his truck is the same even though its been run little since rebuild.None have any problems.His 413 sees probally 6000 miles a years street and strip.My built 440 has an M1 and Dominator and neither have vacuum provisions and Im not drilling any when I have no problems.Rocky
Chrysler Firepower
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Re: Effects of no PCV valve
[Re: moparmikethree]
#746347
01/25/11 01:38 PM
01/25/11 01:38 PM
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Joined: Jan 2003
Posts: 338 Montreal Quebec
STROKIE
enthusiast
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enthusiast
Joined: Jan 2003
Posts: 338
Montreal Quebec
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Quote:
I just realized that my 360 engine in my challenger doesn't have a PCV valve hooked up. There are aftermarket valve covers that have vent breather on either side.
The top of both valve covers are damp with oil coming out of the breathers. do i need a pcv valve, and if so how do i hook it up.
I use 2 breathers on my 451 engine since 4 years... No problems at all. For me introducing oil fumes into intake manifold it's not the best octane booster
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Re: Effects of no PCV valve
[Re: stumpy]
#746349
01/25/11 04:51 PM
01/25/11 04:51 PM
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Joined: Aug 2005
Posts: 4,799 ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Depends on the condition of the engine it could build extreme postitive crank case pressure and start leaking everywhere trying to push oil out.
logan426
Last edited by Logan426; 01/25/11 04:55 PM.
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