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So I’m thinking of installing an oil catch can on my pretty much stock rx7 FD.
I have this understanding.
on the oil fill neck, the top nipple that goes to the pcv and UIM is there to vent crankcase pressure so that boost doesn’t build up in the oil pan, the bottom nipple is where I should route to the catch can as it’s the overflow nipple that sends extra oil to the front turbo via the turbo elbow correct?
so it’s as easy as routing the bottom nipple hose to a catch can? Since I have the top nipple going to the UIM I don’t need to vent the catch can right? It can be a one way hose to the catch can and that’s it?
leave the car alone. there's no reason to do what you're doing. if you're just doing this because you want something to do then change your oil, replace your fuel filter or clean your air filter instead
leave the car alone. there's no reason to do what you're doing. if you're just doing this because you want something to do then change your oil, replace your fuel filter or clean your air filter instead
not doing this just for doing it, not sure why I wouldn’t either as I don’t want oil to be dumping into my turbos.
I’ve been doing a whole refresh of the system, stripped UIM and took it down to the block. New harness, new OMP lines, new fuel, coolant systems. Now I’ve been having an oil leak drivers side and I think it’s coming from the hardline that connects to the bottom oil nipple on the oil fill neck, If I connect that nipple to a catch can, I can test to see if that’s the leak without having to tear down everything to access that hard line. I had put a new hose on that hardline when I went through everything but maybe it found a way to leak
(The seller of the item brought his FD out to the Westcoast for a few meets. He is an aircraft engineer. He commissions a shop to make them.)
you’re always insightful brother thank you. I’m more confused on how to properly set it up. What’s your setup? Are you on stock twins? If so, do you have the top nipple on the oil filler neck going to the UIM and the bottom one going to the vented catch can?
Below are some pics of my set-up. I notice that there is a hose running away from the lower nipple. It seems to go back toward the front of the engine. It might go the front intake elbow, I could not see easily.
The hose from the top nipple runs back to the catchcan.
The tuner shop originally just left that hose open to the engine bay, somewhere near the oil filter. I took that hose and connected it to the catchcan.
My understanding is that the later JDM FD did not have the connection to the UIM, but I suspect that my filler neck might be from an earlier car.
I asked why the shop just left the hose open to the engine bay and they seemed relaxed about it. "The minimal blow by helps prevent corrosion on the undercarriage". They were not adverse to my adding the catch can.
(The shop I use is considered the top rotary shop in Western Canada.)
You can see the blue hose on the catch can is just vented to the engine bay. There is a minimum amount of oil residue in it. But that is after about 35,000 km and over six years.
Hose runs out the top nipple. Under the intake pipe and connects to the upper nipple of the "catchcan". Second pipe is connected to the lower nipple and vents to the engine bay.
Below are some pics of my set-up. I notice that there is a hose running away from the lower nipple. It seems to go back toward the front of the engine. It might go the front intake elbow, I could not see easily.
The hose from the top nipple runs back to the catchcan.
The tuner shop originally just left that hose open to the engine bay, somewhere near the oil filter. I took that hose and connected it to the catchcan.
My understanding is that the later JDM FD did not have the connection to the UIM, but I suspect that my filler neck might be from an earlier car.
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I asked why the shop just left the hose open to the engine bay and they seemed relaxed about it. "The minimal blow by helps prevent corrosion on the undercarriage". They were not adverse to my adding the catch can.
(The shop I use is considered the top rotary shop in Western Canada.)
You can see the blue hose on the catch can is just vented to the engine bay. There is a minimum amount of oil residue in it. But that is after about 35,000 km and over six years.
Hose runs out the top nipple.
Under the intake pipe and connects to the upper nipple of the "catchcan". Second pipe is connected to the lower nipple and vents to the engine bay.
I have my block vented on both sides with a small clear catch cup that recirculates vapors and odors back to the intake pre-turbo. Since my car is single turbo I tapped the rear turbo oil drain block-off plate and install a 3/8" barb which i attached a 3/8" hose to that I lined with a heat resistant sleeve. That hose returns to a 3/8" brass 90 that is in the side port on my baffled IRP oil filler neck and the main vent from the neck is a -10 port on the front. That front -10 line runs to a small clear catch can/cup that has coarse stainless wool packing in the lid, vapors that comes out of the engine collect and drain into the cup.
Depending on driving the cup will have "clean" looking oil in it or smoky black "muck", I've only filled it one time so far.
Last edited by Molotovman; Apr 22, 2024 at 07:07 AM.
Me?
Nope, just a regular guy who is struggling through FD ownership like most of the folks here. Last year the car was a stripped shell back from paint and I've gotten to know it very well.
