So I have been doing some reading on oil catch cans and decided to go the damian routing. I plan on doing from the oil fill neck to the vented can to the rear engine oil return hole. While reading I saw that you wanna have the lines short and large enough for air to vent out. So the -10 AN lines are what I would go with, but I also have heard that in the catch can setup you wanna have the vent lines as long as possible. Now with the conflicting ideas or long hoses vs short hoses it will change where I mount my catch can. I plan on having one made that can mount into the mounting location for the from washer fluid tank and then run the lines out from there but if I go with short hoses I would want one made to fit nicely where the ABS module previously sat. So more or less I am trying to see if I should run the hoses longer or shorter? Any input would be great TIA!

 

Personally I would route the vent line from the rear return to the bottom of the oil filler neck instead of directly to the can. I want to say that long left turns can cause a scavenging effect from that port. Better to have that hose drop off where it can return to the engine while still allowing your catch can to vent excess pressure without filling unnecessarily.

Doing that would also allow you to save a few bucks by running a slightly smaller line.

 

Hey man!

There's a whole world of ways to go for the catch can for track use, it's quite different from a street car. My simple Jaz catch can with the stock oil fill neck has given me zero problems in hard street driving and multiple passes on the Dragon. But, full track use is a different story.

May want to check out IRP's oil fill neck, it's top quality and has the AN bungs on it for a serious catch can setup.

Dale

 

I have the oil neck from IR coming in soon. I'm just debating on if it would be more beneficial to have the catch can with longer hoses or shorter hoses. I plan on taking it to the track more often once the build is done. That's the main reason I'll be going with the Damian routing of it. I have a buddy who is gon a help build a custom catch can so I'm thinking about putting it where the old washer tank sits so it's kinda out of the way and clears the bay up with easy access to drain it if needed.

 

What's old is new again...

If I were really tracking on R comps I would look into the solution on this thread starting at post #205. https://www.rx7club.com/race-car-tec...5/#post5601139

Read the description of the problem and the results. It's a pretty brilliant solution IMO.

If you're just running around on 200 tw tire for HPDE it is probably overkill.

I have also been advised to fill the oil no more than halfway up the dipstick by a certain FD track junky who knows their stuff. The dipstick fill line is actually above the oil pan to block interface.

Between "under-filling" a little and drainable catch can between the filler neck and pri turbo intake elbow I have no issues with parking lot racing and hard turns on RH ramps. I have a stock plastic neck with the bottom nipple capped.