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PCV Delete??

Posted By: ScreaminEagle91 On: 12-09-2008 @ 21:37:09         Reply | Edit
Im sure its been asked before, and i found a good bit of detail on removal of the PCV valve and hoses on an LS1, but nothing on LT1s. Are there any downsides to removing it and replacing it with a breather?
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1995 Camaro Z-28... air-foil, CAI, TB Bypass, ORY, cut-out, Magnaflow catback, more to come!
13.971 @ 99 mph

Posted By: RamAir95TA On: 12-09-2008 @ 21:59:13     Reply | Top | Edit
I think you have the PCV system confused. The PCV valve is on the driver side of the intake manifold in a large rubber grommet.

You simply cannot delete the PCV valve system on an LT1. It is responsible for pulling harmful vapor and gases from the crankcase/lifter valley.

The line from the throttle body to the passenger side valve cover simply supplies the PCV with filtered air from the intake so that the vacuum from the PVC valve can pull the gases out.

If you want to remove the tube from the valve cover to the throttle body and replace it with a breather, you can. But you're basically replicating the system that's already on the car (open system versus closed system).
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95 T/A. Big cam. Stock heads, stock rear, stock suspension, stock bottom end, 100% naturally aspirated. Video Clip.
First and only pass: 12.52 @ 107mph.
Best 60' on 3.42s: 1.68
[ Edited on 12/09/2008 @ 21:59:44 ]

Posted By: ScreaminEagle91 On: 12-10-2008 @ 20:09:33     Reply | Top | Edit
Thanks for the reply, and i want to do exaclty that, remove the hose, and put a breather ontop of the valve cover. The reason LT1 and LS1 intakes get gunked up it because the PCV hose pulls oil into the TB. The TB plate on my car gets covered in oil, so jsut imagine what the intake looks like. Ive also heard that removing the hose and making it an open system, although not emissions legal, can help solve false knock and misfire issues due to oil mixing with the air and fuel. Ive read that the PCV bung on the valve cover needs to be plugged, and a breather needs to be put in place of the oil fill cap. Obviously, the vacuum "pulls" the pressure build up out of the crankcase, and a breather would just allow it to vent naturally. I would like to do it not only to clean up the engine bay a little, but keep the intake a little cleaner as well.
--

1995 Camaro Z-28... air-foil, CAI, TB Bypass, ORY, cut-out, Magnaflow catback, more to come!
13.971 @ 99 mph

Posted By: blackbird93 On: 12-10-2008 @ 22:01:06     Reply | Top | Edit
If you are just wanting to remove the fresh air inlet hose from the throttlebody and replace it with a filtered breather, then you would be ok. But if you are wanting to remove the PCV valve from the left side of the intake, you do that at your own risk. Ever see an engine that blew up from gas vapors in the crankcase, not a pretty site. The PCV system is a necessity on any street driven gasoline engine, without it moisture, and explosive gasses will build up in the crankcase. I've had engines that were getting worn out like yours evidently is (too much blowby), and to keep them in service longer I added a second PCV valve and hose to the intake to them in order to remove more of the blowby. Goodluck with whatever you decide to do.
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1993 Trans Am
Completely Stock
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1993 Trans Am
Completely Stock
[ Edited on 12/10/2008 @ 22:02:09 ]

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