PCV Oil Catch Can, see what your engine is burning!

[Brian R.]

"GM has a new pcv valve that is used on their trucks that is suppose to help reduce oil consumption that some customers have complained of. The new pcv valve (GM P/N 12572717) is known as a “fixed orifice” pcv valve. It does not have any internal moving parts, like many pcv valves do, and will not rattle when shaken."

I'd be interested in finding out more about that valve.

[BlazerLT]

Originally Posted by drdd

doesn't the pcv valve control airflow (mass) by how far it opens? At low idle, blowby is not strong which means the pcv valve will only open slightly. Under heavier engine load, the blowby is greater and the pcv opens wider allowing more airflow (mass) to go thru.

Thus, if vacuum is normal (as determined by MAP and idle), then the PCV is under normal conditions / circumstances to do its job controlling the (mass) ... ???

also, if the blowby is so strong that the pcv cant allow ALLl blowby to escape (or perhaps the catchcan filter is slightly dirty) then the excess goes back thru the breather hose? is that right?

seems like changes in airflow (mass) caused by a filter (gradually over time becoming saturated) would be compensated for at the PCV valve.

thoughts ??

Ok, once and for all, liquids cannot plug this filter. We cannot compare this to an air filter. It is so coarse and stiff it will not plug. The filter element is NOT SOLID, it is just a shell and take a look at the previous photos of a cut away of it.

So please guys, stop saying this filter is going to plug up seeing that any excess in the filter will just drip out and into the vial once you turn your engine off if there is any oil in it at all.

If you have that much blow-by, even a stock system would have a problem with it.

This system does not restrict the PCV line at all. It is made to flow compressed air at over 150psi or the negatice pressure here is practically child's play for it.

[BlazerLT]

Originally Posted by Brian R.

"GM has a new pcv valve that is used on their trucks that is suppose to help reduce oil consumption that some customers have complained of. The new pcv valve (GM P/N 12572717) is known as a “fixed orifice” pcv valve. It does not have any internal moving parts, like many pcv valves do, and will not rattle when shaken."

I'd be interested in finding out more about that valve.

Now THAT is what you call a restriction.

Now you can see that this filter is not a big deal now if GM uses sucha small opening there.

[Brian R.]

Originally Posted by BlazerLT

Now THAT is what you call a restriction.

Now you can see that this filter is not a big deal now if GM uses sucha small opening there.

Here we go with another $64,000 question: What is the point of greatest restriction in a stock PCV valve? It's obvious where it is in this new valve.

[BlazerLT]

Stock system?

I think the major restriction is probably within the crankcase itself.

Can we downgrade to a $64 question, you are emptying my AF bank account here.

[ZL1power69]

LT, i have had this system on for 30 miles now and already contamenents are being trapped in the separator.

[BlazerLT]

Originally Posted by ZL1power69

LT, i have had this system on for 30 miles now and already contamenents are being trapped in the separator.

Doesn't surprise me at all. That stuff would be in your if you never extracted it..

[ZL1power69]

Originally Posted by BlazerLT

Excellent, take photos of your install.

Here ya go dude. sorry for the size and quality of the pics. my digital camera is not working so i used my cell phone, lol.



as u can see this is the crap this thing caught after having it installed for about 30 miles.

[BlazerLT]

Originally Posted by ZL1power69

Here ya go dude. sorry for the size and quality of the pics. my digital camera is not working so i used my cell phone, lol.



as u can see this is the crap this thing caught after having it installed for about 30 miles.

Holy hell bro, you have more than I have after over 400 miles. Good thing you installed that system, that is one helluva lot of oil going back into the intake.

Also, I noticed where you have the hose going from the filter to the intake. Remove the tubing and have the tube going behind the throttle intake bracket instead of through it just in case it interferes with the throttle cable at all just to be cautious.

Like this.



Also, do you have the filter positioned so the arrow is pointing towards the intake?

Can you show me a pic of where it is attached to the PCV valve?

Make sure you give it lots of slack so the PCV valve sits in its rubber grommet properly. Having not enough slack will have the PCV valve sitting on an angle.

[nrlemons]

hmm just curious would the oil that the engine burns normally without the catch can make for a slightly oil burning smell in the exhaust, makes sense it would.

[BlazerLT]

Originally Posted by nrlemons

hmm just curious would the oil that the engine burns normally without the catch can make for a slightly oil burning smell in the exhaust, makes sense it would.

Not all of it burns, but a portion will. The rest will accumulate in the upper plenum and drain back into the crankcase where it will contaminate the engine oil faster.

[ZL1power69]

no prob LT, i'll get that pic of the pcv up for u tomorrow. I do have the hose from the filter to the intake behind the throttle bracket, u just can see it in that pic. yes the arrow on the filter is pointing toward the intake.

[BlazerLT]

Originally Posted by ZL1power69

no prob LT, i'll get that pic of the pcv up for u tomorrow. I do have the hose from the filter to the intake behind the throttle bracket, u just can see it in that pic. yes the arrow on the filter is pointing toward the intake.

Take a photo os where it is going to the intake so I can see it along with the PCV valve one.

In my pic you can see the slack I have on the hose just before the PCV valve.

[ZL1power69]

Originally Posted by BlazerLT

Take a photo os where it is going to the intake so I can see it along with the PCV valve one.

In my pic you can see the slack I have on the hose just before the PCV valve.

again, not a problem. when i get back from class in the morning, i'll snap those pics for ya.

[BlazerLT]

Thanks bud, I appreciate it.