VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: Ohiobenz on December 31, 2021, 07:35:46 am
-
As I'm wrapping up putting the engine in my Samurai back together I'd like to set up the crank case ventilation a little better than what it was like when I bought this rig - a loose hose dangling in front of the intake.
The BOV is eliminated, Air intake is via K&N style cone filter.
I still have the original 1.6TD valve cover breather, which has 2 ports - a larger and a smaller one, there is a fitting coming out of the crank case, it is running a Corrado valve cover.
If I want to avoid a catch can, what is the best way to plumb this?
Should I add a fitting to the intake tubing post intercooler?
Does the smaller port on the breather go to the crank case fitting?
Thanks!
-
I would say that you can use that breather. My setup has the lower crankcase hose going to a tee that joins a hose that feeds in after the airfilter but before the turbo.
The routing you propose seems reasonable if I am envisioning it correctly.
-
Thanks
What about the 2 outlets on the valve cover breather?
-
You don't want to tee into the intake tract after the turbo, if you do you'll be pressurizing the crankcase under boost. You'll want to tee in just before the turbo so there's no boost pressure. You can tee it in after the turbo, but you'll need to add a checkvalve to keep the boost pressure out of the crankcase. This method will block off ventalation whenever you're under boost though.
-
Right.... I wasn't thinking straight there. Didn't want to run any oily vapors through the intercooler, so I guess a catch can will be the answer :-(
-
https://images.app.goo.gl/JZK4NwUHBewUoyGL8
Looking at this solution.
-
I can see running a catch can if you want to have the air sucked up into the front end of the turbo. You would have cleaner air entering the system and keep it out of the intercooler. But if you tee into the air being sent to the intake after the intercooler you wouldn't need to clean it. It would be burned in the engine.
Do the two ports on the valve cover breather connect and allow air to flow out one of them. I am thinking that there is one air entry coming in from the valve cover and then one of the two ports on the breather can be used for the lower hose from the crankcase. Then the remaining port gets a hose that goes post intercooler or on the intake.
Does that work for you?
-
I run a hose from the port on the front of the block
up to a 3-port vw gassser, 2.0, ABA, PCV puck that sits on top of the valve cover like the 2-port TD puck.
-
Fatmobile, where does the large hose from the PVC go to when there's no intake box?
-
ORcoaster, any air post turbo is pressurized and would not work for scavenging the crank case.
I'm not sure where I have room to mount the catch can....
-
Absolutely Correct! Where did my brain go on that one? The only choice for scavenging oil is at the front end of the system then.
Any room to mount a can on the front fender areas? Maybe a small diameter can be between the air filter and passenger strut?
-
This engine is in a Suzuki Samurai...
How do I post pics off my phone?
-
Save the pics to a third-party service like Dropbox and then insert them from there using the icon under the bold icon on this page.
No way to just post photos from your phone directly.
at least not that I know of.
-
PCV goes between the filter and turbo.
-
But not as I tried to explain it; Pre turbo not post with the boost on it. Must have been all the nog for the day that did me in on that.
-
Sounds like you are trying to figure out how to clean the vent gasses before they enter the turbo.
Alot of what my plumbing does is vent the block somewhere other than the valve cover.
The old 1.5s had such a small oil return hole that when it got worn
so much gasses were trying to make it out that hole while oil was trying to drain back.
Eventually the vent gasses would carry so much oil with them that the engine would run away.
The factory cure was to run another hose from the front of the block
where the vacuum pump vents to
to the intake.
I think they did this to the 1.9 AAZ too.
So I made up something to do the same on my 1.6s.
And hooked it to the 3rd port on the 2.0 ABA puck.
Would be nice to have a catch can that drains the oil back into the port on the front of the block.
-
Crankcase vapors/oil mist don't hurt the turbo or intercooler.
-
Maybe not relevant here but
On the mk4 ALH, some say the intercooler works just like a catch can.
Apparently, it's not uncommon for turbo diesel intercoolers to collect oil like that.
As recommended I drilled a small hole in the bottom of it and, sure enough, a couple oz of oil drained out.
I plug it with a gasketed sheet metal screw and drain it periodically now.
-
There is a vent in the "front" of the block, left of the oil filter.
I prefer not to have oil deposits in the intercooler, or coating the turbine.
So I think I'll run the block vent up to the puck on the valve cover and the outlet of the puck to the catch can. Then maybe, if its even an option, I'll run the catch can vent to the intake ahead of the turbo.
With the possibility of condensate collecting in the catch can I'll probably have to put it on the oil change schedule for dumping.
The trick is finding a place to mount the Moroso catch can....
-
Is not there blowby pressure in the crankcase? Would gravity be enough to push the oil down or would the pressure push it up.
I have put long lines made from tubing from the valve cover out the back of cars back in the 60's. The long line helps to keep dirt out of the motor. Have seen filters to keep dirt out.
https://images.app.goo.gl/JZK4NwUHBewUoyGL8
Looking at this solution.
-
I prefer not to have oil deposits in the intercooler, or coating the turbine.
I think you said that earlier. I just thought I would mention that those oil deposits don't hurt either one any. Doing extra work for a non-problem doesn't make sense to me. It's a lot like refusing to eat because your peas are touching your potatoes. Also, venting unburned crankcase vapors to the atmosphere can both make a mess and is certainly environmentally irresponsible.
-
I'm routed to the Moroso catch can now.
It has a breather filter as well, so solid pollutants going into the atmosphere are highly unlikely.
There's a lot going on under the Samurai hood with EPS, remote oil filter, intercooler and now a catch can...
When I go to a snorkel air intake routing the catch can vent to the intake could possibly happen.