I'm over thinking this simple ?
Thread Starter
Racer
Joined: May 2012
Posts: 354
Likes: 0
I'm over thinking this simple ?
PCV valve on the 82 its on the drivers side valve cover, ok I know what its for to vent the crankcase and purge the vapors to the purge canister. I have 15 different opinions on this. Before pcv valves all eniges had JUST a breather-no pcv. Now some one says you have to run a pcv because of ring seal, makes sense ALMOST because on the Buick Turbo cars the pcv valve is not connected to the valve covers instead its in the intake manifold so how in the hell does that have anything to do w/ring seal?-nothing. Point being on my 82 I was going to run 2 breathers one in each valve cover and run the intake vaccum line straight to the purge canister and be done. Any educated opinion on this ? thanks Lance
Race Director
Joined: Jan 2002
Posts: 11,614
Likes: 350
From: No Where USA
Your going to have a mess on your valve covers. Why do you want to run 2 breathers and no PVC.
http://en.wikipedia.org/wiki/Crankcase_ventilation_system
http://en.wikipedia.org/wiki/Crankcase_ventilation_system
Last edited by 540 vette; Mar 25, 2013 at 09:08 AM.
Burning Brakes
Joined: May 2009
Posts: 850
Likes: 36
From: Providence RI
Even the old crankcase-vents had a "draft-tube", which created some negative pressure in the crankcase (at least while the car was moving). Short of going with a full vacuum-pump and separator to evacuate the crankcase and control the oil, a PCV system is the most practical way to prevent the buildup of pressure in the crankcase from the inevitable blowby, and to contain the effects of oil residue in the vent.
I mean, you can do the two vents, but then you'll discover first-hand why people don't usually do that on a street car.
I mean, you can do the two vents, but then you'll discover first-hand why people don't usually do that on a street car.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Pre-PCV was a road draft tube. Breathers were primarily a place to dump in oil and provide some ventilation for the flow through of the draft tube. Interesting to note that PCV was not originally an emission control device. PCV started as an option from the factory and sold to the consumer as a path to a cleaner engine and less messy driveway. This is why you see some cars of the same year -both sold in CA- with and without PCV.
Running breathers alone without a draft tube is only half of the most basic system to vent crankcase pressure.
I can't see how a complete and functional PCV would aid ring seal. I believe they may be mixing the PCV with the purpose of a crankcase vacuum pump, which can aid ring seal. I suppose something like PCV could do this but you'd need much of the engine's intake airflow coming from the crankcase, rather than open to the atmosphere.
Running breathers alone without a draft tube is only half of the most basic system to vent crankcase pressure.
I can't see how a complete and functional PCV would aid ring seal. I believe they may be mixing the PCV with the purpose of a crankcase vacuum pump, which can aid ring seal. I suppose something like PCV could do this but you'd need much of the engine's intake airflow coming from the crankcase, rather than open to the atmosphere.
Thread Starter
Racer
Joined: May 2012
Posts: 354
Likes: 0
yes I thought it thru..........>
Even the old crankcase-vents had a "draft-tube", which created some negative pressure in the crankcase (at least while the car was moving). Short of going with a full vacuum-pump and separator to evacuate the crankcase and control the oil, a PCV system is the most practical way to prevent the buildup of pressure in the crankcase from the inevitable blowby, and to contain the effects of oil residue in the vent.
I mean, you can do the two vents, but then you'll discover first-hand why people don't usually do that on a street car.
I mean, you can do the two vents, but then you'll discover first-hand why people don't usually do that on a street car.
pcv going on!
Race Director
Joined: Jul 2001
Posts: 15,892
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