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Old 11-18-2004, 09:47 AM
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pcv valve

Quick question, what is the pcv valve used for? Emissions? Also should i hook it up or is it not needed. tnx

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Old 11-18-2004, 10:38 AM
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Its used to scavenge engine blow by and run it into the intake, usually right at the carb, so it can be burned. Its good to have and costs nothing. Just have a good breather in the other valve cover so it doesn't draw in dirty air to supply the PCV valve.
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Old 11-18-2004, 11:59 AM
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pcv stands for positive crankcase ventilation, just figured i'd add to what jmark said
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Old 11-18-2004, 05:42 PM
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PCV

[size=3]Doc here

It'll also keep the engine/engine compartment and undercarriage much cleaner (won't dump oil overboard)

If you have one keep and maintain it...If not I would advise installing one!

Doc
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Old 11-18-2004, 06:56 PM
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All true,also,be sure it has a baffle in the valve cover where you put it or it will drink oil flung off the rockers,you don't want people to think you have a two stroke under the hood. I once saw a ford that blow the oil pan and valve covers near off,bulged and stretched em out from a backfire because the crankcase was loaded with fuel vapor.
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Old 11-22-2004, 08:32 AM
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i put the pcv valve in and it looks close to plate in my valve cover. when i look down the baffle i can touch the plate and im just curious to know what the plate is used for. also will my pcv work correctly or will it suck oil.
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Old 11-22-2004, 09:29 AM
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Re: pcv valve

Quote:
Originally posted by bigford556
Quick question, what is the pcv valve used for? Emissions? Also should i hook it up or is it not needed. tnx
It sucks internal engine fumes back to air intake to be reburnt,,..
older engines had a breather tube that let all fumes oil etc go out the engine any and everywhere ,onto roads into air without a thought of sucking it back to intake for reburning,,..

pcv
positive crank vent

aka breather pipe,,.

aka blow by tube,,..

Last edited by Simo; 11-22-2004 at 09:22 AM.
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Old 11-22-2004, 12:31 PM
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PCV

I have a 350 small block and the valve covers don't have baffles inthem , at high RPM's it looks like a 2 stroke as someone mentioned, What are my options besides having baffles welded in my valve covers, can I just use breathers on both sides or do I have to have a vacuum hooked up to keep from exploding something. I bought this car setup like this and am new to high horsepower engines so thanks for any help.
Dan
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Old 11-22-2004, 12:43 PM
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Something I'm suprised nobody mentioned is that the vacuum on the crankcase expands the rings and helps them seal. That's why you see 800 hp Big Blocks with the PCV hooked into the header collecter.
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Old 11-22-2004, 03:16 PM
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PCV

[size=3]Doc here:

To be quite honest, actually I've never heard of that aspect of a PCV valve before...

But I guess it makes sense. I know , from the Very first Comp engine I built,

my local parts guy sold me 2 PCV kits and told me to use them both, said they'd keep the engine cleaner since I'd be pulling it down all the time, Just wipe down the parts/block with Thinner and it's good to go again on reassembly. And he was right!

I know a lot of Street rodders use them for the same reason.

I used to think of them as an "EVIL" smog part (years ago, when they first came out) NOW, I wouldn't run an engine without one!

Us olde Dawgs LEARN something NEW everyday! Thanks NXS..

Doc
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