Just got the engine back... have some questions about this Vac tube
 

Hey guys,
I just got the engine back from KD rotary, and I have started to reinstall the engine. However one of the vaccum lines has me confused on the engine. It doesn't have any clamps on it. As a matter of fact I can slide it up and down. I have attached some pictures for your opinion,
TIA
Here is an overview of where I'm at:
http://www.snoby.net/forum/connected_overview.JPG

Here is a close up of the hose fully on the nipple
http://www.snoby.net/forum/connected.JPG

And here it is with me sliding it off,
http://www.snoby.net/forum/connected1.JPG

This vaccumm line seems to be a molded prebent line.

So do I need to put some type of hose clamp on this?

That is part of the engine ventilation system, although there is no pressure or vacuum on it, it should not be loose. If the hose is in good shape, tie it down with a tie wrap, if not replace it with a 6mm ID tube.


Hope this helps,
Dan

"Engine Ventiliation System"? What is that? Oh and why would they want to take the air from the compressed side of the intake?
Thanks for your help!

"engine ventilation system"?
 

I think Chadwick meant to say PCV system or positive crankcase ventilation system. These hoses are attached to the compressor side of the primary turbo because it is constantly spinning, thus creating a vacuum inside the inlet housing. Even under boost this phenomenon occurs and this will help stabilize the churning air in the "crankcase" where the oil sits and other "vapors". This also helps keep the gasoline smell inside the engine and not eminating into your garage and also helps in the evaporative emissions system, whereby the charcoal canister by the rear diff. is keep free from vapor buildup. The PCV system also helps keep oil from shooting back up the oil fill tube(notice the hose descending from the fill neck) and keeps the fumes from following also. You need to keep those hoses attached otherwise you'll get noxious vapors coming from the motor compartment and also will keep the check ball in the PCV valve closed(unless it's a later model, whereby the pcv valve is bypassed all together with a different hose.)
Hope that helps.
Art

There are two lines that come out of the rotor housings under the "Rats nest" that conect to this tube. It is on the intake side of the turbo so that is has filtered air to breath. Think of it like a crankcase vent. There is alot of pressure inside an engine other then just the combustion chamber, the air has to be able to move in and out or it puts an unnessisary load on the engine components.

Dan

Ok,
That makes compete sense, thank you very much for the information. I think that this particular line is a molded line so I don't know how I tie down that line. I will call dave at KD rotary after the holidays and ask him if I should buy a new line or not...
I love this forum...
Thanks guys
Oh and Merry Xmas!

RTS3GEN,
The PCV vent is the line right behind the one he has marked in his picture. The line in question does not have a PCV value in it. The 2 lines run straight from the top left side of the rotor housings into a single metal tube that comes off the "Rats nest" with a 6mm hose into another 6mm metal tube which comes out in the picture shown.

Hope this helps,
Dan

Doesn't matter, it's all part of the evaporative system. Keeps the fumes inside the charcoal canister and in the crankcase. It just makes a big loop thru the system.;)
But thanks for the input!
Art

If you follow the lines on your engine you'll see how the whole system feeds back into itself. Notice that the PCV valve feeds into the oil fill neck, then follow the fill neck down and you'll see another hose, this dumps back into the "rats nest" lines. It doesn't really matter where it comes from or goes to tho, the question was if he needs to retain it! Yes, I say keep the hose, and only replace it if you'd like to, as long as it isn't cracked it will be just fine to use again. Sorry if I confused the issue.
Art:D