Pcv ?

[Lupo]

What about running AN lines right to the exhaust, past the cats to prevent any damage to the cats & 02s? I was contemplating this as it would reduce pressure and prevent the mess from building in the engine bay.

Input?

You would have a nice burning oil smell all the time.

 

[AutoSHO]

Jason has his PCV run through the exhaust... It does not cause any significant odors. However, if you live in a strict emissions area you might want to put in a valve to turn it off while getting E-tested.

 

[Bizzy]

I have the same CCV as Jason. I don't notice any odors or muck at the tail pipe. Bout the only thing I do notice about it is the clicking of the one-way valve underneath the car at the y-pipe at idel. Even at idle the exhaust pulses are enough to pull a small amount of vac on the crank case.

I need to get a breather filter and hook it up so that the engine has someplace to get a little more air from, to actually have a little flow thru. Right now the system is capped off, and just a nice vac is pulled.

 

[SHOZ123]

Better off with it capped. Flow through will add moisture from the atmsophere.

 

[SonicRiot]

This is confusing...

I thought to ditch the PCV, the valve cover should be capped with a breather with a one-way check valve. Then the intake lines should just be capped all together to prevent a pirate air leak.

Am I getting this right?

Also, I didn't know that a PCV could make the car more prone to detonation. Removing the PCV and replacing with a breather to the air will prevent detonation? How significant is this? Enough to up the compression a point? A few points? Or is it just enough that the car won't pull timing as much?

I guess I'm just trying to figure out if this could also benefit a N/A SHO... or If I just secretly want a breather for looks... :corn:

 

[Lupo]

This is confusing...

I thought to ditch the PCV, the valve cover should be capped with a breather with a one-way check valve. Then the intake lines should just be capped all together to prevent a pirate air leak.

Am I getting this right?

Also, I didn't know that a PCV could make the car more prone to detonation. Removing the PCV and replacing with a breather to the air will prevent detonation? How significant is this? Enough to up the compression a point? A few points? Or is it just enough that the car won't pull timing as much?

I guess I'm just trying to figure out if this could also benefit a N/A SHO... or If I just secretly want a breather for looks... :corn:

The purpose of the PCV system is "Positive Crankcase Ventilation". It's supposed to cycle clean air through the crankcase, as well as relieve pressure from blowby and oil vapors (especially at WOT). This is why your intake gets all crudded up with oil/gunk. It's from the PCV system that takes oil vapors and blowby, and lets them get sucked into the intake vacuum to be sucked up and burned.
Any time you introduce oil/oil vapors in the intake, you increase the chance of detonation a little. Not anything to worry about on a N/A motor. Maybe a little bit to worry on a S/C turbo motor, but I'm just being ****.

If you can duplicate the action on the PCV system, without blowing positive pressure in the crankcase, or sucking the oil vapors/blowby into the intake, then you will have a clean intake, and won't have to worry about oil vapors and blowby increasing the detonation factor.

Extra credit for supplying a vacuum to the crankcase, which puts less drag on the crank, as well as seal the rings better.

I'm working on an electric vacuum pump setup which hopefully should meet all the criteria.

 

[1slickRED89]

I found some interesting information from a family friend who restores 1950's vintage miller Indy car engines. Miller engines use a small camber that uses baffles to separate oil particles and return the recondensed oil to the crankcase. The design has very little pressure drop and, according to him, works very well. Corey

 

[AREA 91]

I have also ran filters on both of my sho's. I like it. The intake stays MUTCH cleaner, and adds a little "bling " under the hood. The Honda boys like that. :laugh_ti:

 

[K-Dawg]

So for my N/A car, I have the choice of: stock, stock w/ catchcan, stock w/ filter(s), out the exhaust, or electric vacuum pump. Don't really think I'm going to put together a electric pump setup (unless its cheap, compact, easy, and lightweight). I guess my main goals are clean intake/heads and maximum ring sealing. Which is best for me? I can see flaws with each of them.

 

[PanamaPat]

Can i just cap the connections at the TB/Intake and run 2 K&N breathers?

You might get oily fumes coming into car and oily residue around the filters.

I use a catch can with an K&N filter to catch fumes and residue, then run from their to the intake (pre-blower) to get rid of the fumes.

The first hose between the valve cover and the TB is capped on both ends. The second hose from between the block was routed to a Summit catch can (the one with a K&N filter on the top). The pcv hose is shoved around 1/3 the way down the can through one of the side ports, then the other end of it is routed back to the elbow on the inlet of the Vortech.

The catch can takes car of all of the oily resisdue that gets blown out of the engine during boost. I periodically check it and drain it.

The return line from the catch can back to the blower maintains a slight vacuum on the catch can and keeps the oily vapors from penetrating the engine compartment.

Not a perfect setup, but it works.

 

[K-Dawg]

So the concensus is that the catch can keeps the intake clean?

 

[Yamaha V6]

Well, there's still oil vapor in there, so it'll keep it much clean-ER than just the line, but doesn't completely remove oil from the air circulating in there. For a N/A app, it's fine.

 

[Yamaha V6]

Would be interesting to run a drain line back to the oil pan, just like under the Vortech, huh Pat? Maybe tie in the bottom of the catch to a Y under the blower's return & leave that petcock open. I have the catch can on the shelf, I didn't make it that far before selling the track car.

 

[SHO Nick]

I have a question on this....

I have some oil in my intake on my N/A setup at any given time..I dont like this...

I want to add a breather filter to the crankcase line, and cap the TB off...BUT...

Would a Catch can between the Line that goes to the Valve Cover to the top of the TB a good idea?


ALSO..from the posts here is the Line that connects to the the UNDERSIDE of the TB part of the PCV System? If so, can I cap it off with a breather filter, or what would you suggest, leave it be or what?

 

[SHOZ123]

If you have a NA car do not put a filter on the PCV intake. This will lean out your mixture as the air entering the filter and being drawn into the TB will be unmetered by the MAF.

What you want to do with a NA car is plug the PCV intake port and then run a catch can between the oil separator and the TB PCV intake hose. Be sure to have a means to drain this as it will need to be done about once a week.

I have a self draining one on my '97 and it will puke out a little but every time I shut off the motor. The more humid the air the more muck. The more air going through the PCV system the more muck.

I have tried electric pumps but could not maintain any vacuum at WOT, which was my goal. The exhaust pipe vacuum generator is a good idea too.

 

[Sho-Driver]

Another option is to route your PCV through your exahust utilizing a check valve and a notch/angled bung. Basically, you would run a line from the oil seperator to the exhaust, post catalytic converter. On the throttle body where the PCV would normally connect, would need to be capped in addition. At idle, there is MORE than enough vacuum on the crankcase. As you progress in RPM, you increase flow which also increases vacuum on the crankcase. At WOT, you have maximum flow. The stock configuration will have no real vacuum at WOT.

There are also no noticable oil smells nor oil soot at the end of the tail pipes.

 

[SHO Nick]

What you want to do with a NA car is plug the PCV intake port and then run a catch can between the oil separator and the TB PCV intake hose. Be sure to have a means to drain this as it will need to be done about once a week.

Im confused...the only lines I have running to my TB right now, is the one from the Valve Cover(Cyl#6), and one Directly under the TB that runs somewhere between the Cylinders in the "Engine Valley"....This one in the "valley" looks to have moisture comming from it....I think...

 

[Sho-Driver]

Jason has his PCV run through the exhaust... It does not cause any significant odors. However, if you live in a strict emissions area you might want to put in a valve to turn it off while getting E-tested.

It would actually be easier to pass emmisions if you were to just disconnect this and let the exhuast vacuum suck in fresh air.

 

[SHO Nick]

Bump for my last post...

 

[Sho-Driver]

How do you know moisture is coming from it? I do not think we quite understand what you are asking.

If you are running the stock set up, you'll be fine. Yes, moisture can come from the crank case, but this will not hurt anything under combustion.