RX CATCH CAN & BREATHER CAP PROBLEM - CAUSED OIL LEAK - BEWARE *HELP*

[jcollins91106]

Originally Posted by Whitehambone

I have had the catch can installed for almost a year with no issues. I do not take the car out when it is snowing or if the roads are salty. But today was below freezing. I took out the metered valve and installed the non-metered one.

I see alot of people running a breather and the non metered valve...I wonder if this is necessary...feedback anyone?

[The Stig]

Originally Posted by jcollins91106

I see alot of people running a breather and the non metered valve...I wonder if this is necessary...feedback anyone?

We're talking about the metered valve on the catch can right? If so...

The non-metered valve was/is offered as an option because some people were hearing a "whistling" sound with the metered valve. The "whistling" sound was/is the air going through the valve. There is no performance/real reason to swap the valves out, but if you hear the whistling and it annoys you then go for it.

[jcollins91106]

Originally Posted by stieger

We're talking about the metered valve on the catch can right? If so...

The non-metered valve was/is offered as an option because some people were hearing a "whistling" sound with the metered valve. The "whistling" sound was/is the air going through the valve. There is no performance/real reason to swap the valves out, but if you hear the whistling and it annoys you then go for it.

cool good info, I dont care about a whistle...what about the breahter......pros cons?

[The Stig]

Originally Posted by jcollins91106

cool good info, I dont care about a whistle...what about the breahter......pros cons?

Breather is just a way to help relieve positive pressure in the crank case. The RX breathers have a built in metered valve so that only a certain amount of air gets in at a time. While a breather with a non-metered valve would cause you to run lean, the RX does not because it's metered. There are really no down sides to running a breather.

[jcollins91106]

Originally Posted by stieger

Breather is just a way to help relieve positive pressure in the crank case. The RX breathers have a built in metered valve so that only a certain amount of air gets in at a time. While a breather with a non-metered valve would cause you to run lean, the RX does not because it's metered. There are really no down sides to running a breather.

Ok, I need to check to be sure what I have now...I am pretty well versed in the ls3 and upgrades but breathers are new to me, never really needed one before.
So how do I tell if I have a metered or non metered valve and breather vs non breather version.

[The Stig]

Originally Posted by jcollins91106

Ok, I need to check to be sure what I have now...I am pretty well versed in the ls3 and upgrades but breathers are new to me, never really needed one before.
So how do I tell if I have a metered or non metered valve and breather vs non breather version.

GENTLY shake your breather. If you hear a rattle then you have a metered valve in there.

[IndeedSS1]

Originally Posted by jcollins91106

Ok, I need to check to be sure what I have now...I am pretty well versed in the ls3 and upgrades but breathers are new to me, never really needed one before.
So how do I tell if I have a metered or non metered valve and breather vs non breather version.

All RX breathers have check valves, which is why the term metered is used. It still lets in a small amount of unmetered air and will change your fuel trims some. Most people needing breather will be tuning anyway.

The catch has to be specail ordered not to have a check valve. My can was making a noise and Tracy send me a fitting without the check valve. His new can design works so well it doesn't need a check valve on a NA LS3.

If you shake the can or breather you will hear it rattle from the check valve ball. No rattle no check valve.

[jcollins91106]

Originally Posted by IndeedSS1

All RX breathers have check valves, which is why the term metered is used. It still lets in a small amount of unmetered air and will change your fuel trims some. Most people needing breather will be tuning anyway.

The catch has to be specail ordered not to have a check valve. My can was making a noise and Tracy send me a fitting without the check valve. His new can design works so well it doesn't need a check valve on a NA LS3.

If you shake the can or breather you will hear it rattle from the check valve ball. No rattle no check valve.

that makes sense, now the last silly question... I have a tune already, there is no way my trims will be off installing the can, right? just making sure that I am understanding correctly.

[The Stig]

Originally Posted by jcollins91106

that makes sense, now the last silly question... I have a tune already, there is no way my trims will be off installing the can, right? just making sure that I am understanding correctly.

Correct. Installing a catch can does not alter your fuel trims at all. SC2150 also says that the breather does not alter fuel trims either.

[jcollins91106]

thanks, thats what I thought but I didnt want to be"that guy!" lol Back to the OP....any new info, now I am really curious what caused this.

[wbdinger]

Pull the lines off at the can engine running.
#1 should be vacum and hooked to the outside connection on the can.(intake connection)
#2 should go to the inner hose connection on the can.
#3 check for flow thru the can by pulling #2 off the can and vacum present there........ heres a pics of My 10 LS3 connections



Hope this helps a little

[BLACK10]

Not sure why all of a sudden your engine pressurized, but i would def think that the rear seal needs to be checked along with the vc gaskets, etc.

Was the car at operating temp yet when you smelled the oil? Is the car running fine? If not perhaps its an intake valve or piston not sealing correctly and presurizing the crankcase.

[Parag]

you for sure have a blockage. the RX breather is valved off so it would not relieve this pressure. check your lines, blow through them
or a broke piston

[Fishdadddy]

HMMMMM