I’m back.....and misfires

[Kimovitzh]

That is the oil separator and the PCV unit. Its a terrible idea to just leave it open. Its the PCV that system keeps the crank case pressure down and helps keep carbon more at bay.

With that in mind wouldn’t negative pressure in the crankcase then encourage blow-by?
Also, 2 x 22mm pipes ensure that there is no pressure.

On some cars without the oil separator maybe its not as impactful but since the V10 has a long history of blowing out gaskets venting to atmosphere wouldn’t be the greatest idea. Also remember that on the closed ring gaps you need to have vac pulled out to keep the rings sealed. So for multiple reasons it would be a terrible idea to not have the system hooked up.

Can you elaborate what part you mean when you say “the closed ring gaps”, what part do you refer to?

Lastly if you know that unhooking and blocking off the oil separator and PCV unit stops any misfires why wouldn’t you just replace the unit. In theory you basically just proved its bad.

A working PCV-system is still letting a lot of oil (relatively) in to the intake manifold, and then there is the longlivity of the PCV in it self.
The previous owner had it replaced a year ago at Audi in germany and already it is broken again. When I removed the manifold to clean the valves, 250-300ml of oil was sitting in the manifold, only way it can get there is from the PCV (also the water cooled pipe from the PCV to the manifold was full of it).

As I said before, my A3 with free venting crank had no problems at 335.000km, that’s 160.000km, over 7 years, with no mechanical failure and no engine parts replaced (The EGR was deleted as well).
I’ve seen multiple cars run fine for years with a free venting crank, from 3-cylinder to V8’s, and not just old v8’s ;).

If you read around the internet, and that’s a bad start to begin with, many people has the same concerns as you.
And equally the other way around. And I get that people are concerned.

Thanks for the welcoming!
I’ll be the ignorant guinea pig with this controversial fix, maybe start my own topic with interval reports, huh?

[justincredible]

Well to put it simply. Your venting to atmosphere so only when pressure in the crank case is enough do you see any venting.

The PCV system is self is SUCKING air out of the crank case. BIG DIFFERENCE and even bigger results.

If you have too much negative pressure in the crank case yes that could encourage blow by but since the vac is equal to the intake of the air that is negated.

If there is a good amount of oil in the intake then by default the oil separator isn’t working efficiently and thus the PCV system. Also if you unplugged the PCV system and resolved your issues you just proved it was broken in the first place. So if the part was replaced a week ago or a year ago its not working properly.

This gets me off on a tangent on shops getting cheap replacement parts and not the better made OEM or close to oem units.

And sure you can unplug lots of stuff and have lots of stuff not hooked up but that doesn’t make it right or the correct way to do things. It also doesn’t mean you’re not causing other issues.

With that being said and that is just the word of reason and caution. HELL if your getting workable results great. Just report all the good and bad because if you were getting 300ml of oil in the intake with a non working oil separator your still going to get that oil its just going to be coming out the hose or other pipes you have hooked up.

As you said. The internet is full of BS bullshitters and just endless shit when you read some forums. I would strongly suggest you start a thread on this. I think its a great idea. The only thing I would say is don’t be that guy… and by that I mean if this ends up being the worst idea ever and works like shit… just say so. SHOW ALL THE GOOD AND>>> THE BAD…

This forum is small but we have been lucky. We have kicked out or ran out all of the ultra bullshitters. Its amazing how full of it some guys were. So if its good info or good info on something bad. Please post it.

[compugeek5150]

I’d still love to replace the PCV with something like a catch can if it were possible…

[SIX6SIX]

I’d still love to replace the PCV with something like a catch can if it were possible…

We have a kit available but there’s a new version to be released soon so you may want to wait a few weeks.

www.savicorp.com