PCV catch can install.

[RH77]

Originally Posted by Formula413

Not to threadjack but if you are running a warmer thermostat you would probably be well advised to add a transmission cooler

Apologies here for being off-topic, but yeah, the cooler is something I should look into. The synthetic fluid is merely a hopeful measure to prevent heat-related damage.

Originally Posted by Olympiadis

Perhaps you should start your own forum where instead of modification and testing, you have a policy of non-tampering, and instead encourage folks to not mess with their vehicles and just take them in for dealer service to restore them back to factory spec.
Imagine how happy you would be then.

You could remain in a world where your members goals were exactly the same as your goals, instead of this horrific world where people are happy doing things differently.

First off you should be embarrassed for being such a know-it-all and bringing such negativity to a forum that should be friendly to posting individuals modifications and results. You have more info to add that might be helpful? fine. I'm sure no one minds that at all.

Second, you give advice in what seems like absolute commands. For instance saying that using a catch-can is bad, period. Perhaps you should offer to fund the engine rebuilds for those who read your post so that what you suggest isn't advocating false economy. If you take an extra minute to imagine, the production of engine replacement parts, engine tear-down and rebuilding, and the acquirement of the funds to do so is about infinitely worse for the environment than filtering out a small amount of contaminants from a PCV line. This is not to mention the fact that not everyone is obsessed with emissions levels and may only be interested in economy, convenience, efficiency, or reliability.

I really didn't want this to be so personal, but this kind of routine is getting very old. Seriously. It is very discouraging.
People posting there exploits here may not be 100% correct about everything every time, but I don't think verbally beating them down is much of a help.

You will no doubt try to defend or counter now. Personally I have no interest whatsoever. Have at it.

As a Moderator, yet participant in this discussion, I have to expand upon mwebb's and Olympiadis' comments. Whether or not I agree with Olympiadis' statements, the purpose of the forum is to freely exchange information using courtesy, and posts not be a catalyst for a shouting match. In this case, I simply ask mwebb to utilize more information and respect in discussions.

In response to the content, my project car is a '98 model that is way out of the league of even LEV, let alone SULEV. With it's simple design, I can't imagine (without significant information) that the mod is detrimental in any way. I see contaminants collected, and remove them. What more?

Without sparking a runaway back-and-forth argument, I challenge mwebb or any other person in disagreement to the "catch can", to respectfully cite specific examples of lost FE, increased emissions, and/or data from your own experiments. Simply stating that it "doesn't work", will not cut it here. Users here should know that we need clean data in opposition before your comments are taken seriously. As it stands now, you are in the "Control Group" with unmodified vehicles, and your comments (thus far) are ambiguous and lack validity.

RH77
Moderator

[mwebb]

right
more information
here goes
blue trace is crankcase pressure at idle on the VW ALH TDi engine
every one of those pressure pulse s that is not captured by the
Crankcase vent valve or PCv system would be expelled to atmosphere through the catch can plumbing -
this would be the source of the HC pollution i was referring to

the pressure pulses are much stronger off idle at cruise or WOT .

there is no way around this when using the catch can , you will be venting / wasting HC emissions that could be burned and would provide some slight amount of power while reducing HC emissions

there is no benefit to using a catch can and the system pollutes more

blue trace
i hope this makes it easier to understand , with understanding comes
responsibility
- now you can not say -
" i do not see how this is bad "

you can not put the genie back into the bottle

[D.O.G.]

Originally Posted by mwebb

right
more information
here goes
blue trace is crankcase pressure at idle on the VW ALH TDi engine
every one of those pressure pulse s that is not captured by the
Crankcase vent valve or PCv system would be expelled to atmosphere through the catch can plumbing -
this would be the source of the HC pollution i was referring to

the pressure pulses are much stronger off idle at cruise or WOT .

there is no way around this when using the catch can , you will be venting / wasting HC emissions that could be burned and would provide some slight amount of power while reducing HC emissions

there is no benefit to using a catch can and the system pollutes more

blue trace
i hope this makes it easier to understand , with understanding comes
responsibility
- now you can not say -
" i do not see how this is bad "

you can not put the genie back into the bottle

Maybe I missed something in someone else's post, but my catch can was installed in the hose between the PCV and intake manifold, just below the carby.
The whole thing was under manifold vacuum, there was no "venting", there was nothing "expelled to atmosphere", it simply separated the heavier stuff from the lighter stuff before it reached the manifold. I then drained this heavier stuff off, when the engine was stopped.

The only down side I can see is that I may have been removing a bit of lubrication for the valve stems.

[Josh8loop]

Originally Posted by D.O.G.

Maybe I missed something in someone else's post, but my catch can was installed in the hose between the PCV and intake manifold, just below the carby.
The whole thing was under manifold vacuum, there was no "venting", there was nothing "expelled to atmosphere", it simply separated the heavier stuff from the lighter stuff before it reached the manifold. I then drained this heavier stuff off, when the engine was stopped.

The only down side I can see is that I may have been removing a bit of lubrication for the valve stems.

This is exactly how I imagined a person would want to hook it up too. Mine is hooked up in this fashion except it's a Cyclonic separator instead of the standard catch can. If you don't have the effluent air from the catch can going into the intake it's dumping HC overboard as mentioned-unless you have a superd high tech specially designed filtration setup.



..

[Josh8loop]

Originally Posted by mwebb

right
more information
here goes
blue trace is crankcase pressure at idle on the VW ALH TDi engine
every one of those pressure pulse s that is not captured by the
Crankcase vent valve or PCv system would be expelled to atmosphere through the catch can plumbing -
this would be the source of the HC pollution i was referring to

the pressure pulses are much stronger off idle at cruise or WOT .

there is no way around this when using the catch can , you will be venting / wasting HC emissions that could be burned and would provide some slight amount of power while reducing HC emissions

there is no benefit to using a catch can and the system pollutes more

blue trace
i hope this makes it easier to understand , with understanding comes
responsibility
- now you can not say -
" i do not see how this is bad "

you can not put the genie back into the bottle

Great information! Thanks for sharing. I am trying to figure out the magnitude of the pressure pulsations-I just see mV readings. Have any idea how high the pressure goes?


..

[Frank Lee]

So where does the gook from the catch can end up?

[TheEnemy]

Frank: Hopefully to the nearest collection area for proper disposal/recycling.

Mwebb: Yes on a newer engine its not necessary, and yes its a bandaid for a worn out engine.

Isn't it better to have a bandaid on a worn out engine than to just let it go?
Besides there is more in oil that can also foul the O2 sensor, and it can plug up the cat.

I'll take a bandaid over nothing.

[skyking]

Thanks for keeping this up. I had forgotten, I have a big blow by tube hanging down and dripping foulness now and then. I need to put a can on it as well. Whatever I do will hold enough to allow dumping at the oil change interval, while I am under the rig anyway.

[Frank Lee]

Frank: Hopefully to the nearest collection area for proper disposal/recycling.

But probably it goes in the regular garbage.

[D.O.G.]

Originally Posted by Frank Lee

But probably it goes in the regular garbage.

No, it goes in with the used oil from normal oil changes. I take it up to the local council recycling center when I have about 20 litres.