I need to install an oil catch can since I got a nice oily drivers side of the engine at the track. A friend of mine gave me a catch can which has a big vacuum hose nipple which is about the size of an -8 AN line. I'm thinking of swapping out the big vacuum hose nipple on the can for a -8 AN male fitting so I can run -8 AN line to the catch can. My engine is pretty stock and was wondering what the best way to go about using a -8 line with this catch can. Anyone running something similar? I'd like to see what other people's setup look like. I did a search but didnt find a good thread with pictures of everyone's setup.

 

Here is the best setup by Damian

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/oil-catch-can-setup-my-race-car-792344/

 

I've seen his setup before but unfortunately I can't do mine like his because Im still running the sequential turbos. My catch can is similar to his.

 

Here's my setup. Only works if you've deleted the cruise control bits though.

 

Thanks. How did you connect those big hoses to the engine? My catch can has a hose nipple thats looks to be the same size as yours. I was thinking of buying a Greddy can and thought about putting it there since I dont have the cruise control. It's good to know that it fits perfectly right there.

 

Same can I have... What do you put the inlet and outlet to?

 

I've updated the oil filler neck vents to '95 style (removed and capped off the PCV line to the intake manifold). The remaining line that used to go to the turbo now goes to the catch can first, and from the outlet of the can, returns to the turbo. I just spliced the catch can plumbing into the existing lines without having to run any new ones.

 

The diagram shows a continuous line from the neck to the primary inlet, however, in reality there are two rubber hose locations to splice the can into, one by the primary turbo inlet and one right off the filler neck. Can I connect the catch can to either location? Does it matter which I use? I remember reading a warning regarding a siphon effect and I want to avoid improperly plumbing the catch can.

 

By connecting the outlet of the oil catch can to the compressor inlet (as shown in the pic and sketch) you are defeating the main purpose for installing it.
You want instead to avoid oil/oil vapor getting ingested by the compressor, then soiling the I/C.
You should disconnect and plug the return line to the compressor inlet. You could now use the unused fitting to vent the can to the atmosphere. The difference in pressure will make collecting excess oil more effective. Also you shall make the crankcase "breathe" and relieve blow-by gas, that have now no other ways to go.
You can just turn the unused fitting up and put a small filter on it.

- Sandro