Crankcase venting do's and don't's
#1
Crankcase venting do's and don't's
I know nothing about the physics involving proper venting of a crankcase system. i am guessing that most of this is for emissions
and environmental concerns? I see that a number of products exist that modify the factory set up, and while attractive,
these are not just high on the priority list.
what I do understand is that the crankcase needs to breath, but I hate the idea of those vapors going back into
the intake and/or throttle body.
with that in mind, is there some minor modification that can be done? my first thought is to cap the venting that goes into
the intake. can those lines just be capped off and the hoses from the valve covers vented to that atmosphere? I had a 3.0CS
a while back, and the only engine venting was a tube coming off the valve cover, that fed a hose into the air cleaner. I ran
a very long tube, off of the valve cover, and extended that under the car and behind the passenger compartment, and
capped that off with a small filter. can I do something similar with this set up, or is it a lot more complicated?
PS I don't seem to have any "issue" to address with the breathing system, but I am swapping my plastic oil filler for a metal one, and thinking I
could deal with some of the breather tubes off of the filler while I am in there
suggestions???
and environmental concerns? I see that a number of products exist that modify the factory set up, and while attractive,
these are not just high on the priority list.
what I do understand is that the crankcase needs to breath, but I hate the idea of those vapors going back into
the intake and/or throttle body.
with that in mind, is there some minor modification that can be done? my first thought is to cap the venting that goes into
the intake. can those lines just be capped off and the hoses from the valve covers vented to that atmosphere? I had a 3.0CS
a while back, and the only engine venting was a tube coming off the valve cover, that fed a hose into the air cleaner. I ran
a very long tube, off of the valve cover, and extended that under the car and behind the passenger compartment, and
capped that off with a small filter. can I do something similar with this set up, or is it a lot more complicated?
PS I don't seem to have any "issue" to address with the breathing system, but I am swapping my plastic oil filler for a metal one, and thinking I
could deal with some of the breather tubes off of the filler while I am in there
suggestions???
#4
You are not boosted so stay stock, there’s little to none to be gained by changing it
the rear of the oil filler to the TB, or still a waste of time???
FredR is running a setup on a near stock car that might be interesting to you.
#7
Only thing you need or want to do, is the Greg Brown oil separator under the filler neck when you get in there.
is it fair to say that this is primarily a GTS issue with GT/S4 and earlier not to worry about?
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#8
You need the crank case to vent somehow. If it is blocked off you will damage your engine internals, blow out gaskets, and spew oil all over the front of the engine from the dipstick tube.
The pressure will find the weakest link and escape using it.
I have a Provent hooked up to the passenger side cam cover and a few hoses hooked elsewhere. It then vents to the smog pump which I setup to only vent to the filter housing.
It separates over 3 oz on extremely spirited driving with runs to redline over 25 miles.
If this wasn't in place the engine would suck in massive amounts of oil (like the stock system) and shoot out blue smoke.
If you don't feel like making a custom setup you can get Greg Brown's Provent system which connects to the intake like the stock system does.
Now the engine in my 89 doesn't drink a drop of oil.
If you do any really spirited driving above 3K RPM I highly recommend you use an air/oil separator to reduce ingested oil and to keep your intake clean.
The pressure will find the weakest link and escape using it.
I have a Provent hooked up to the passenger side cam cover and a few hoses hooked elsewhere. It then vents to the smog pump which I setup to only vent to the filter housing.
It separates over 3 oz on extremely spirited driving with runs to redline over 25 miles.
If this wasn't in place the engine would suck in massive amounts of oil (like the stock system) and shoot out blue smoke.
If you don't feel like making a custom setup you can get Greg Brown's Provent system which connects to the intake like the stock system does.
Now the engine in my 89 doesn't drink a drop of oil.
If you do any really spirited driving above 3K RPM I highly recommend you use an air/oil separator to reduce ingested oil and to keep your intake clean.
#9
All S4+, GTS has -other- issues WRT oil management beyond this, but is certainly affected the most by it.
All I have is GBs "Oil Filler neck baffle" via http://www.precisionmtrwerks.com/products/products.htm
And I dont suck up a single drop.
#10
This thread mentions a lot of specifics in terms of venting and engine management.
End result for me was to pull everything back off and go back to stock set up, but with Greg’s Baffle...
https://rennlist.com/forums/928-foru...catch-can.html
End result for me was to pull everything back off and go back to stock set up, but with Greg’s Baffle...
https://rennlist.com/forums/928-foru...catch-can.html
#11
End result for me was to pull everything back off and go back to stock set up, but with Greg’s Baffle..
your post was interesting to read, and more interesting to hear that you came full circle. since you mention in that post about oil in your intakes,
can you report your results by going back to stock venting along with the GB baffle? did you also install the stock S3 baffle?
#12
Crumpler, this is exactly my plan, but I am curious to learn about what others have done and what cars are most problematic.
your post was interesting to read, and more interesting to hear that you came full circle. since you mention in that post about oil in your intakes,
can you report your results by going back to stock venting along with the GB baffle? did you also install the stock S3 baffle?
your post was interesting to read, and more interesting to hear that you came full circle. since you mention in that post about oil in your intakes,
can you report your results by going back to stock venting along with the GB baffle? did you also install the stock S3 baffle?
This is a 20-25-30yr old topic. Some things are best left as history and reviewed. An insane amount can be learned via google, search here on RL...and the decades long boiled down answer is the GB part.
There are others like it, but has seemed to work the best.
Boosted apps, full racing...may require other solutions, or not..
#13
This is a 20-25-30yr old topic. Some things are best left as history and reviewed. An insane amount can be learned via google, search here on RL...and the decades long boiled down answer is the GB part.
There are others like it, but has seemed to work the best.
Boosted apps, full racing...may require other solutions, or not..
There are others like it, but has seemed to work the best.
Boosted apps, full racing...may require other solutions, or not..
One thing that I think the RL knowledge-base under appreciates is the benefits from breathing out from the back of the engine under deceleration and from the front of the engine under acceleration.
#14
Crumpler, this is exactly my plan, but I am curious to learn about what others have done and what cars are most problematic.
your post was interesting to read, and more interesting to hear that you came full circle. since you mention in that post about oil in your intakes,
can you report your results by going back to stock venting along with the GB baffle? did you also install the stock S3 baffle?
your post was interesting to read, and more interesting to hear that you came full circle. since you mention in that post about oil in your intakes,
can you report your results by going back to stock venting along with the GB baffle? did you also install the stock S3 baffle?
Results are good, or at least much better then the accumulation found in the stock set up.
The only other change I made, and I think Seth did the same, is to replace a plug with a vent on the other cam cover.
This is capped, in anticipation of a better vent system some day....
Maybe Greg can give us an update on his system in development for the S3, if he is following.
Best, Dave.
#15
This is a 20-25-30yr old topic. Some things are best left as history and reviewed
sorry for the redundancy; no one need comment or respond if they are bored or sick of it.
personally, I never tire of learning more, and all the information obtained, helps me make the most informed decision
i have learned from this thread and already commented that i will be install the GB baffle, S3 baffle, metal filler neck and, leave
all the stock plumbing for breathing.
thanks to everyone for there comments and insight. HUGE help. thanks again