Phil99TA

Can someone explain why we shouldn't eliminate the PCV system all together? Isn't the purpose of it to reduce crankcase pressure? If we vented the valve covers using open breathers wouldn't that accomplish the same?

I'm just sick of oil consumption. I'm sick of trying to bandaid this problem. I have 2 fuel filters inline with the PCV system as well as having the PCV valve vertical and i'm still getting oil into the intake.

Damian

iTrader: (89)

Well I am by no means an expert on all this PCV stuff, but I do know that you must have a certain amount of crankcase pressure for the motor to run properly. Completely eliminating the PCV and running breathers would vent out way to much pressure. Maybe someone else can elaborate on this....

There is a new PCV valve out now, used for the truck motors. "They changed the orifice size to lower the amount of air flow the system would deliver to the intake. By doing this the air(vapors) wont carry as much oil with it from inside valve covers to be burned by the motor." That is a direct quote from a master tech at GM <img src="gr_stretch.gif" border="0">

I too have been fighting the PCV valve war for over two years, so far I have been getting my *** kicked along with everyone else. But, this new valve "may" be some hope. Another guy on the board has already tried it, and noticed about a 75% decrease in consumption. That's definately a start! You can also covert over to the LS6 system, but you will need the valley cover, and there is some machining required on the block for it to fit.


Josh

thxone

iTrader: (1)

I've have the new PCV valve in my car now. I have notice no oil consumption at all(over about 1,500 miles). But, the big plus was no high rmp ping.

LS1derfull

Phil, (Master TEch here) you have most likely restricted suction side of pcv to the point where vent side is backing pressure into throttle body and hence still burning oil. I would use Metco breather on passenger valve cover and plug factory vent to throttle body. Or eliminate filters and try truck pcv valve. A livable situation cant be that hard to figure out IMO.

mmiller

iTrader: (1)

Can someone post the part number for the truck PCV valve you are talking about? What is the difference between the PCV that comes on the LS1's and the truck PCV?

antsam17

New PCV valve # is "12572717". I put this in my Z along with some Royal Purple 5W30 and hopefully my consumption of 2 qts per 3K will reduce. Its only about $3.00 from the dealer <img src="gr_eek2.gif" border="0">

antsam17

The difference is that the LS1 Stock PCV is a valve that opens and closes with a larger diameter orifice than the new valve. The new valve is not a valve at all but rather a fitting because it is empty with just a smaller hole on the throttle body side. Hope this answers the question.

Diesel

I just picked up my revised PCV valve yesterday and can definitely see how it will reduce oil entering the intake, as opposed to the stocker.

I don't have oil consumption issues, but this was good insurance anyway IMO.

CHRISPY

Someone else had a good idea too. They used a washer in between the rubber boost and the stock PCV valve. The hole in the wash was smaller than the orifice on the PCV valve effectively restricting it. He eliminated his oil consumption by doing this.
Cheers,
Chris

highgear

If you have a true Vertical PCV Mod; I fail to see how you can still be sucking oil. I have had the Mod for 2 yrs and NO oil burning. I use the Purolator PV98C pcv valve. However, the stock PCV also worked in the Vetical position. The 98C is calibrated the same but gives another 90 degree turn. Also, I use a clear Fram fuel filter from the PCV to the intake.

bigSS

[quote]Originally posted by highgear:
<strong>If you have a true Vertical PCV Mod; I fail to see how you can still be sucking oil.</strong><hr></blockquote>

Where can I find out how to do this mod?

mmiller

iTrader: (1)

[quote]Originally posted by highgear:
<strong>If you have a true Vertical PCV Mod; I fail to see how you can still be sucking oil. I have had the Mod for 2 yrs and NO oil burning. I use the Purolator PV98C pcv valve. However, the stock PCV also worked in the Vetical position. The 98C is calibrated the same but gives another 90 degree turn. Also, I use a clear Fram fuel filter from the PCV to the intake.</strong><hr></blockquote>

Highgear,

I am glad to hear that since you went to the vertical PCV mod and used an inline filter that you have had no oil consumption. Can you provide in detail how your revised PCV system is configured and also part numbers for everything? <img src="gr_stretch.gif" border="0">

WayneSS01

There are two PCV mods listed in the Install Documents at http://www.installuniversity.com Lots of other goodies there also. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />

zombiedude

iTrader: (1)

--------------------------------------------------------------------------------
I did this awhile back. Update! You have to change the element more often if you RUN the crap outa it like I do. Elcheapo mod


I have been reading on the oil use thing since I have 1. Seems to be PCV in most cases. I think I came up with another mod. I took a crankcase filter out of an older chevy breather and removed the element, using 1/3rd of it and puting it in the tube rite before the pcv vave. Pullout pcv valve and put it in. Not stuffing but making it fit. 1 oil change on record but NO OIL USE! Change element every oil change. Monitor at ur driving habits. hopes this helps!

35th SS LE vert 325hp M6/hurst

<img src="gr_images/icons/wink.gif" border="0">

RPM WS6

iTrader: (3)

I’m just running a ‘vert PCV deal right now, but I used to use a Metco too. Same thing with me, the ‘vert mod in conjunction with the Metco seemed to stop the usage, but when I took the Metco off the usage came back <img src="images/icons/confused.gif" border="0"> <img src="gr_sad.gif" border="0">

So I’m going to try that new PCV valve now and see how it works. If not, then the Metco is going back on.

LS1derfull

Where specifically can Metco be purchased?
TIA

C5 Tweaker

PCV is required to remove moisture, fuel, and combustion byproducts from the oil. Without, the oil will quickly loose its detergent capability, have possible fuel dilution, and sludge will form if oil is not changed Very frequently.

The crankcase runs just below ambient pressure under most conditions (thus the flow from the TB).

If you have reduced PCV flow at the throttle body, you have an equivalent reduction in PCV flow. Not good.

Phil99TA

Just a little update. I now have a Metco breather along with the vertical PCV going into 2 fuel filters. Here is a pic of the setup
http://www.fbody.com/members/phil99ta/pcv5.jpg
I'm no longer getting any oil into the intake, however, there is no longer any suction coming from the fresh air tube that goes into the throttle body. Does this mean that the PCV system is no longer functioning? I like the fact that the oil usage is gone but I'm a little concerned that I've restricted the PCV system and it could damage the motor

Phil99TA

I think the lack of suction at the TB hose is because of the Metco breather, not a restricted PCV. If you think about it, the breather is replacing that hose as the fresh air source, no? I did a little testing last night (thx Chris for the idea) and pulled a PCV hose at the back of the valve cover. I did feel some suction in that hose, although just a little bit. I then bypassed the filters and ran a straight shot from the PCV into the intake manifold, checked the hose at the back again, and felt the same amount of suction, so I think i may be ok after all. I did order that new PCV fitting, so if that stops oil consumption without using any filters then I'll just keep that.