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Old 10-08-2010, 02:15 AM
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PCV setup SBC.

I am wondering how to setup the PCV system to have the exhaust pull out the fumes and run it out the exhaust. I always see rubber hoses coming from the PCV valves back towards the exhaust be never see how they attach to the exhaust. Also for correct O2 operation, would they be connected upstream or downstream of the O2's in the headers? I have always wanted to do that on my engine. I'm just thinking of different options before I cut the valve covers for the breathers. Any ideas?

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Old 10-08-2010, 06:58 AM
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Crankcase Evacuation System The photos of the system are there.

You run the PCV normally. From the crankcase to the intake manifold. On a SBC that usually means from the valve cover to the intake manifold.

Your run the evacuation system from the closed breathers to the exhaust. There is a check valve on the tube that enters the exhaust.

I would definitely mount the tubes downstream from O2 sensors. The chances of fouling the O2 sensors with oil would be a problem if you were upstream of them.
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Old 10-08-2010, 02:55 PM
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If you are feeding these into an exhaust system with mufflers you are wasting your time, it only works with open exhaust, any backpressure in the exhaust system renders an evac system useless.
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Old 10-08-2010, 03:12 PM
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Further: Any interduction of air (a leak) for or aft of the 02 sensor will throw it off. must be leak free (10x pipe diameter distance up stream and down stream)

You don't need a "Pan Evac system" on a street car.
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Old 10-08-2010, 06:37 PM
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Quote:
Originally Posted by ericnova72
If you are feeding these into an exhaust system with mufflers you are wasting your time, it only works with open exhaust, any backpressure in the exhaust system renders an evac system useless.
Gonna have to disagree with you Eric. The velocity over the end of the tube creates a low pressure area. Certain cars in the 80's from the factory had A.I.R. systems without the pump. They designed the entrance into the exhaust so that it would "suck" air into the exhaust. Also, NHRA now requires mufflers and racers are still using pan-evacs. I will admit it makes it tougher to do, but it will still work with mufflers.

Quote:
Originally Posted by F-BIRD'88
Further: Any interduction of air (a leak) for or aft of the 02 sensor will throw it off. must be leak free (10x pipe diameter distance up stream and down stream)

You don't need a "Pan Evac system" on a street car.
Was not aware of the 10 diameters, but that does make sense.

I agree with your last statement. The idea behind a pan-evac is to pull every last ounce of power out of an engine and to compensate for the lack of PCV due to the low to zero (or even negative) vacuum in the intake manifold during most of the race. No return on the street.
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Old 10-08-2010, 06:43 PM
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Why don't you want to run a conventional pvc system ? A $20 set of aftermarket valve covers will already have the ports and baffles in them .
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Old 10-08-2010, 06:55 PM
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Quote:
Originally Posted by Caballerokid
I am wondering how to setup the PCV system to have the exhaust pull out the fumes and run it out the exhaust. I always see rubber hoses coming from the PCV valves back towards the exhaust be never see how they attach to the exhaust. Also for correct O2 operation, would they be connected upstream or downstream of the O2's in the headers? I have always wanted to do that on my engine. I'm just thinking of different options before I cut the valve covers for the breathers. Any ideas?
For future reference, you may remember seeing those metal one-way check valves that are used on air injection emissions systems? Those check valves are similar to what's used in a crankcase evac set-up between the engine and the bologna-cut aspiration pipe that's plumbed into the collector.

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Old 10-08-2010, 07:55 PM
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The reason I went with the valve covers I did is because of a specific look i want for the engine. i always though it was neat to run this evac. setup. i have always wanted to build a race motor but for the street and when i say street i mean barely streetable. i have also wanted to run the a/fs so as to better tune the engine bank by bank, run the evac setup and also run a flame thrower setup with the MSD box. And Cobalt... i have seen those, i knew they were check valves but weren't sure how they worked exactly. thanks for al the input guys!
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Old 10-08-2010, 08:27 PM
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I'm sure by the time you are done it will shoot flames out both ends.
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Old 10-08-2010, 09:01 PM
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Quote:
Originally Posted by Caballerokid
I'm just thinking of different options before I cut the valve covers for the breathers. Any ideas?
So if I read this correctly you are planning on just cutting holes in the covers ? No baffles ?
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Old 10-09-2010, 01:11 AM
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Quote:
Originally Posted by adantessr
So if I read this correctly you are planning on just cutting holes in the covers ? No baffles ?
The valve covers are like these valve covers but the covers I have came with baffles that I will be installing once i cut the holes for the breathers.
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Old 10-09-2010, 01:11 AM
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Quote:
Originally Posted by F-BIRD'88
I'm sure by the time you are done it will shoot flames out both ends.
What's that supposed to mean?...
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Old 03-05-2011, 12:48 PM
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Evac kit definetly works dude...welded mine up yesterday. I have flowmaster 44's dumped at the rear axle and a hairy cam in my 383...and the breather will suck and stick to my hand at idle. It works like a damn charm. Its a no brainer...SAY NO TO PCV!
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Old 03-05-2011, 06:59 PM
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Quote:
Originally Posted by BigLeoRocks
Evac kit definetly works dude...welded mine up yesterday. I have flowmaster 44's dumped at the rear axle and a hairy cam in my 383...and the breather will suck and stick to my hand at idle. It works like a damn charm. Its a no brainer...SAY NO TO PCV!
Sounds good. But, I would keep an eye on the engine oil level for a little while just to make sure it isn't sucking too hard. Also, I still don't understand why you are so against PCV .
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Old 03-06-2011, 03:39 PM
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Cuz it just doesn't look *****in enough. Works great and is more than enough for a street engine but it just ain't *****in enough.
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