View Poll Results: delete or keep pcv
Delete pcv and put breathers?
23
31.94%
keep pcv and put a catch can?
49
68.06%
Voters: 72. You may not vote on this poll
keep pcv or delete it?
TECH Regular
Joined: Jan 2005
Posts: 475
Likes: 0
From: Orlaanndoooo
The idea behind the PCV system is to recycle any unburned fumes....and to draw a little fresh air thru the crankcase to evacuate the acids & byproducts of combustion. Supposed to help keep the oil cleaner longer too. That is the purpose of the vent line that hooks up before the throttle body...to draw filtered air into the crankcase.
In our cars it also seems to be a way to lubricate the intake manifold & combustion chambers.
In our cars it also seems to be a way to lubricate the intake manifold & combustion chambers.
Without a metered vacum source pulling the vaoprs out & filtered fresh air through the crankcase most of the harmful vapors recondense in the crankcase after the motor cools contaminating the oil & leaving corrosive residue on the internal parts. On a street car you MUST pull filtered fresh air from metered vacum source through the crankcase.
Staging Lane
Joined: Jan 2008
Posts: 58
Likes: 0
Without a metered vacum source pulling the vaoprs out & filtered fresh air through the crankcase most of the harmful vapors recondense in the crankcase after the motor cools contaminating the oil & leaving corrosive residue on the internal parts. On a street car you MUST pull filtered fresh air from metered vacum source through the crankcase.
after talking with tracy from rev extreme, im a big time believer in a GOOD pcv setup, check out some of the stuff they have built and raced with and then tell him he doesent know what hes talking about. thanks for your help tracy, maybe someday there will be an end to the never ending discussion on pcv setups
where are the harmfull vapors when the engines running? No chance of them contaminating the oil then? Its all going to get mixed regardless, theres no avoiding it. All your bearings are not exposed and I dont see it eating your camshaft away. Its never happened to me anyway. I think its just paranoia.
Some good reading:http://www.whowon.com/Results.asp?Tr...StoryID=200304
I'm also a graduate of the Reher Morrision Pro Stock engine building school & have been building street & race engines for over 35 years.
This is set up that I have been using for over 45,000 miles and it seems to be working fine..Did a head swap last spring (about 20,000 mils ago) and it looked good inside. I use the LS6 PCV and LS6 valley cover with a breather in the oil fill hole on the valve cover and GMPP valve covers with no emissions connections on them.
Last edited by slt200mph; Feb 28, 2008 at 11:27 AM.
PCV system The PCV system is a MUST have item. the engine is an air pump right? well theres just as much air moving around under the pistons and gasses that get by the rings - (AKA blow-by) has to be vented out some how, from what ive been reading the stock PCV systems do need to be updated to the ls6 style when you have the intake off. my .02C
You have to believe in something!I believe I'll have another Beer
You have to believe in something!I believe I'll have another Beer
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I run the LS6 valley cover and LS6 PCV system with a breather in the oil fill hole on the pass side valve cover. The valve covers are from GMPP and have no holes or fitting on them. I welded a baffle under the oil fill hole to keep the oil from the rocker arms from throwing a lot of oil up into the breather..I clean the breather once a month with brake clean and compressed air. I have been running this combination of parts for about 40,000 miles now with no problems.
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That relieves the crankcase pressure, but does nothing to evac the harmful & corrosive vapors that condense back into the crankcase....and the hoses if not filtered hanging down at speed one will have a stronger vac from the venturie effect than the other & pull unfiltered dirt, dust, moisture & who knows what directly into the engine.
