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Old 01-29-2005, 05:38 PM   #1
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PCV delete questions

On the subject of a PCV delete, I have done some reading on this and am wondering when this could be beneficial. I understand basically why it might be a good option on a 99+ but what about 94-98. What are the benefits vs. detriments to doing this? I have heard in a supercharged application it isn't always a good idea.
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Old 01-29-2005, 08:01 PM   #2
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Basically it's just so you don't have oil being sucked up into your intake manifold and then into your engine. I personally think you could get away with leaving your PCV on and build a little catch can in the line. But if you insist on delete it I have two brand new filters for $10 shipped.
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Old 01-30-2005, 05:22 PM   #3
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I really didn't want to delete it from the start because I couldn't see a benefit for me other than cleaning up all the lines in the engine compartment I guess. I had someone the other day pushing me to do it and I was just wondering if there was something about deleting it I hadn't considered. Thanks!
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Old 01-30-2005, 05:41 PM   #4
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well breather filters are good but they smell at idle, you will smell the oil fumes.... I would get an inline filter, an inline fuel filter will work fine. Or you can figure out a collector box, have a hose going in to a box then another hose comming out so the oil will fall out of the air and only the air will go though to the intake.
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Old 02-01-2005, 04:55 PM   #5
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Any of you every work on an engine without a working PCV system?

Oil cruds up inside without a PCV system.

PVC stands for Positive Crankcase Ventilation. In a PCV system manifold vacuum sucks air thru the crankcase to pull fumes, blowby and water vapor out of the engine. Breathers do not do this.

Not running a PCV would also be illegal and wouldn't pass any visual smog check, if that applies.

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Old 02-02-2005, 12:10 AM   #6
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i say keep it personally

for the same reasons Steve posted above, and also that by applying vacume to the crankcase, it also helps your rings seat better
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Old 02-02-2005, 06:18 AM   #7
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Here are the pro's and cons of the removing the PCV system

Pro's. The PCV pulls engine vapors from both valve covers one goes to the Air intake tube before the T/B gunking it up and the other goes to the upper intake before the runners gunking it up. Any engine more than a couple of years old has gunk in the upper and lower intakes from the PCV. Older carburated engines did not have this problem because the fuel would wash most of it away, on Injected engines there is no fuel in the intake system to wash it away. It also looks better without the 2 hoses.

Con's Removing it will cause the car, especially in idle, to smell of oil fumes from the vent box that pulls in fresh air in front of the windshield. There is a remote possibility that you could increase the chances of having detonation in the crankcase if fuel vapors are not excavated properly, especially if you have worn rings that cause more than normal fuel to slip by. This can cause a blown head gasket, oil pan gasket or even put a hole in the block. It is also illegal in every state with car inspections.

I have deleted the PCV but I am considering putting it back on simple because of the damn oil smell that can get odiferous especially with the A/C or heat on.

My advice keep it.
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Old 02-02-2005, 12:09 PM   #8
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I did the inline filter modification.
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Old 02-06-2005, 03:11 PM   #9
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OK, I wasn't going to delete the pcv system but... there is no place on my intake piping to connect the vacuum line. What would happen if you connected both vaccum lines running from both pcv valves into one t - then ran that into the upper intake?
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Old 02-06-2005, 11:07 PM   #10
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Just customize a catch can, have the line comming off the valve cover go into the top of the "can" then another comming out the other side, this will let the oil drip down to the bottom and then only "clean" air go into the upper intake, just drain it every now and then and your fine, it will take forever for her to get alot of oil in it. Its just hard designing such a set up.
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Old 02-06-2005, 11:14 PM   #11
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Quote:
Originally Posted by wendyc
OK, I wasn't going to delete the pcv system but... there is no place on my intake piping to connect the vacuum line. What would happen if you connected both vaccum lines running from both pcv valves into one t - then ran that into the upper intake?

Yes you can run it to one with a T that can be purchased at any automotive store
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