For you boosted guys I was wondering where you guys positioned it. After noticing oil streaks on the hose connector that joins the drum air filter to the blower I've decided to pick up one of these things. There's not really that much space left with the SC in place.

 

 

Is that a GReddy can I see there?

Actually I was hoping to see or hear from someone that has the regular battery in place.

 

Yes it is a greddy and that was a "test fit" of the battery a few months back... It fits with the full size battery in place...

 

I picked this up during lunch break.... now I have to figure out where it can go...

 

PDM also sells the iridium IX 2 steps colder... I saw their catch can a while back after getting mine. Space gets tight after awhile...LOL

Didn't know you lived so close to them.

 

I work only 5 minutes away from PDM. I even know Don who owns the shop. Met him through the NWN website, auto X and one or two meets. Really nice guy.

Ok, after spending some time looking for space I'm going to mount it right on the corner of the battery. With that clamp that came in the box I'm going to strap it to the black battery cover.

 

Exactly where does this thing hook up when you apply it in a turbo application?

Thanks
Bruce

 

between crankcase/valvecover and intake... "catches" all the oil vapors by condensing it out first.

 

Whats the point..I never understood the point of these

-matt

 

Crankcase vents out vapors and sometimes oil. If it's routed back directly to the intake stream, you get gunk into your intake manifold. With catch can, oil drips down.

 

Cool that makes sense, and it seems like a great thing to have that way your not ripping your intake apart every couple of months to clean all the crap out.

Bruce

 

Are this the same consept as a "crank case vent filter" off the front hole/breather of the front manifold ?? I still dont understand

-matt

 

yes because it was originally vented back to the intake tract via a hose.

 

So in the factory set up it sends all that crap back into the intake, that seems kinda stupid. But it seems like a catch can is a really good idea. No wonder my breather filter always looks like crap after a couple of months.

Bruce

 

Emissions related but it usually doesn't pose much of a problem on a properly functioning engine.

 

Bringing up an old thread but I had some questions.

Putting an Oil Catch Can on a boosted motor, do you need to worry about a check valve between the valve cover and the can ??

Anyone running these now-a-days ? I know this is a Really OLD thread, but the sujbect is good to discuss instead of making a new thread. (like I already did in the all motor forum )

Thanks guys

 

I will be putting one in my car. I subscribe to Turbo magazine and most of the vehicles in there have a catch can but I don't see any check valve. If you know how a house vaccum works the catch can is like a "quarantine area" to put it into laymans terms. Here is a link to a description.

http://www.jazzproparts.com/ProductD...tCode=00B009HB

 

Im going to purchase an Air/water serperator from Home Depot or Sears

-matt

 

For those that are wondering...

I dont know of any emission related reasons for the PCV system, but I know you cant let blowby gasses build up in the crankcase. PCV system needs a vaccum source (the intake manifold) to suck it out.

Problem is that these blowby gasses do carry small amounts of oil with them, and it creates gunk in the intake manifold and worse yet, the intake valves. Another issue (that all 3.5s are prone to due to their higher outputs of blowby) is that oil vapors in the combustion chamber decrease the octaine of the mixture. This is why alot of 5.5 and 6 geners experience engine pinging on the top end of the RPMs.

With the catch can mounted in-line between the PCV valve, and the IM, oil condensates INSIDE the can, and significantly reduces the amount of oil going into the IM. I have a small can (really is an air/water seperator from home depot, about an inch wide and 3 inches tall), and my 3.5 fills it 1/2 way in about a week. Where as my 3.0 would take a month to do that.

 

Im not worried about emissions due to the fact that I have NO cat, NO EGR valve. Im just worried about mounting it inline and running boost. Just trying to find feedback to anyone that has it on a boosted 3.0

-matt

 

It creates no ill effects.

 

Just a comment for those who don't realize. Oil deposits in the intake manifold don't just come from the pcv side of the valve covers. As you know the other side is also connected to the intake before the throttle body.

When the engine is idling and there is good vacuum the pcv system operates just like you think it would. It sucks air in through the front side valve cover and goes out the rear side through the pcv and into the intake manifold.

However when you are accelerating or when the manifold vacuum is low the air flow in the front side valve cover actually reverses and goes into the intake manifold as well. When it reverses and at how much or how little vacuum depends on the condition of you engine, more blow by then the sooner it reverses. Just putting a catch can on the pcv will not eliminate the oil in you intake you need one on both sides or some other method of vapour removal.

Many of the V8 guys I see use the Moroso or Mr Gasket evacuation system which uses a venturi you exhaust header to pull the vapour out through the exhaust. Probably not recommended for emissions testing but at least it doesn't go into your intake.

Right now I am just using a filter in each bank and it seems to work fine, no oil seems to be visible around the engine after many 7k runs. I am looking into a better system for next year.

This is directly from the FSM:

The positive crankcase ventilation (PCV) valve is provided to conduct
crankcase blow-by gas to the intake manifold.
During partial throttle operation of the engine, the intake manifold
sucks the blow-by gas through the PCV valve.
Normally, the capacity of the valve is sufficient to handle any
blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air cleaner, through the
hose connecting air cleaner to rocker cover, into the crankcase.
Under full-throttle condition, the manifold vacuum is insufficient to
draw the blow-by flow through the valve, and its flow goes through
the hose connection in the reverse direction.
On vehicles with an excessively high blow-by some of the flow will
go through the hose connection to the air cleaner under all conditions.

 

So you are running a breather on each bank and no PCV?

I have been running a breather on my front bank for at least a year but still have the rest of the PCV assembly in the stock setup.

 

I took out the oil catch can and reconnected the recirculating hose from the front bank to the pancake air filter. After putting in the Aeromotive fpr there's just no room left to put this thing in.

 

If you block off the PCV, would you not experience idle problems? Doesn't the PCV pull in a small amount of metered air through the crank case and the ecu anticipates to help adjust and maintain idle? For those running a filter on the intake side and keeping the PCV setup, any change in idle or acceleration?

 

So what is the cause of the high rate of blow-by on the 3.5? Is it the engine design? Quality of the rings or internals?

 

I was looking through my z31 FSM (you know, FSM's are nice casual reads!). I found that on these cars, they used the Charcoal canister to pull blowby out of engine. I know up through 3rd gen's at least have them. How would this work as an option to the oil catch can?

 

Using aluminum rings is the problem I believe. Not really aluminum but Ive heard from a reliable source nissan used looser rings to get more HP. Pretty retarted either way....

Chris- blocking the PCV wouldnt cause idle problems as its metered. If its not using it it wont adjust for it. It does cause burned/unburned fuel and deposits to sit in your oil if you dont pull a vacume on it. This will degrade the oil and wear your engine. Thats why its good to run it in the first place.

It'd be interesting to see how it is hooked up. Theres a Z at the local PnP maybe Ill take a look at it tomorrow....

~Alex