The engine needs to be able to vent vapors that come from the oil, leak by rings, etc., and instead of venting them straight to atmosphere like old engines used to do, by venting back into the air intake of the engine these vapors are combusted and disposed of in a clean, safe way. Lubrication? None that I have heard of. Lead used to be in gasoline partially for lubrication of the valves but they've long since figured out how to keep them free.

 

for the catch can install...

locate hose going from driver's side vavle cover to intake tube...
the catch can goes in the middle of the two..

that's it.

 

Pics of Catch-Can installed .. anyone

 

So many ppl are saying so many things!!! ~8-(

I may have to get 2 catch cans.....

 

bump

 

Does anybody really know? or are these all just semi educated quesses?

 

in re: to crankcase ventilation, there are 3 hoses that are on the car stock...
one runs the from the pcv valve to the intake manifold upper collector... this one is on the passenger valve cover. this is the only pcv valve on the car.
the next one runs between the valve covers to equalize the pressure. this is on the front side of the valve covers.
the third one is the "high load" vent, and it runs back to the intake pipe (after the MAF sensor!)

here is a pic:



here is an explaination of how the system works on our car:




in my turbo subaru, i used to get oil in my intercooler, and then someone told me its was from blow-by...(not excessive... but normal amounts) i found the following link, and realized i had the same problem as him..

http://cjsupra.kendra.com/PCV-Can.html


i bought the same catch can, and installed the same way. never had a problem with oil in the i/c again. he is right about the HC smell... that's about the only drawback to not routing your crankcase ventilation back into the non-charge side of the intake...

the catch cans i see people buying now are not designed like the one above... the greddy one and the helix one both have 2 barbs, but they are not for 2 inputs... rather for 1 in, 1 out. so, with these catch cans, you run them in-line on the crankcase vents.

now in my turbo 350, i did not want the gases going in to the non-charge side of the intake, as it would make oil accumulate in the i/c again... so, i was going to put in a catch can. i then did some research and looked at a bunch of diagrams and actual pictures, and realized the oil baffles on the Z are designed really well, and not a whole lot of oil should be coming out...

so, we just put a breather filter on the driver side valve cover, and left the pcv valve (on the passenger side) run back into the intake manifold upper collector. there is no oil on the filter after 4000miles (yes 4000mls in 3 weeks ), so i am not going to put a catch can.

now, this will still allow HCs (and oil mist) back into the manifold, (from the pcv valve), but atleast it is not fouling up my intercooler. anyone who has tore down the intake plenum knows even on a stock Z, there is a fine oil mist covering the inside walls...


so back to how to route the hoses to you catch can... you have some options...

1) if you want no HC blow-by back into your combustion, by something like the Jaz Can above, and route both the pcv and intake breather hoses to it. just remember to cap the nipple on the manifold, and on the intake tube. your car will smell like an old muscle car

2) if you dont want any oil in your intake plumbing (pre-throttle body), you can either just put a breather filter on the driver valve cover and cap the intake tube nipple (this will stop all oil AND all HC).... OR run the greddy or helix catch cans in line on the hose that connects the driver side valve cover to the intake tube. the first option will again leave your car smelling like a muscle car, while the second one will allow the HC back into combustion, but keep the oil from returning.

3) if all you want is to stop oil all together, but let all HC still be combusted... you need 2 catch cans, one for the pcv, one for the "high-load", running in-line on the hoses.

does this all make sense?

m

 

Ah, finally an answer to this confusing setup. SKiDaZZLe this is an excellent write up. Kudos

 

Thanks Skidazzle, write-up and diagram makes a lot of sense.

 

Thanks for taking the time to write that.

 

Pic of mine installed via Skidazzle's option #2

 

Thats a nice clean engine bay moog.

And TY skidazzle for that comprehensive write up.

 

Michael, awesome write up!


I'll have to re-read a few times to totally comprehend your rational. I'm staying NA, but I track a lot, with a lot of sustained WOT in the upper RPM's.


BTW....glad you're backing up your exterior mods with breathtaking performance!

 

Does anybody have the pix of how to install the can.