Catch Can Full
#1
Registered User
Thread Starter
Catch Can Full
Hi Z Friends,
this is my my first post on here and I’ve searched for this issue but haven’t come up with anything. My 04 Z is strictly track, I bought it this way. Caged with bolt ons. It came with a plastic generic oil catch can and it seems after every race my catch can is completely full, sometimes to the point that it’s spitting out of the breather. It’s a messy situation and was wondering if anyone know what could be causing this. One friend told me could be crankcase pressure? I’m not sure.
thanks!
this is my my first post on here and I’ve searched for this issue but haven’t come up with anything. My 04 Z is strictly track, I bought it this way. Caged with bolt ons. It came with a plastic generic oil catch can and it seems after every race my catch can is completely full, sometimes to the point that it’s spitting out of the breather. It’s a messy situation and was wondering if anyone know what could be causing this. One friend told me could be crankcase pressure? I’m not sure.
thanks!
#2
New Member
Where do you race in mass?
Is the catch can vented or still attached to the plenum?
Crankcase pressure would be from the rings as you know, I would do a dry/wet compression test. I believe 185 psi is the target. I had one way down at 85 dry/115 wet once...
Is the catch can vented or still attached to the plenum?
Crankcase pressure would be from the rings as you know, I would do a dry/wet compression test. I believe 185 psi is the target. I had one way down at 85 dry/115 wet once...
#3
Registered User
Thread Starter
I race at New Hampshire Motor Speedway, Thompson, and Palmer! Hopefully racing at Watkins Glen this year.
My catch can is vented, I’m not sure where it would attach to the plenum. I did notice that I was missing a hose or plug to my throttle body on the bottom side of it which points toward the driver side strut tower.
I’m not sure the difference between wet/dry compression test but when we did a compression test I didn’t have anything under 170!
My catch can is vented, I’m not sure where it would attach to the plenum. I did notice that I was missing a hose or plug to my throttle body on the bottom side of it which points toward the driver side strut tower.
I’m not sure the difference between wet/dry compression test but when we did a compression test I didn’t have anything under 170!
Last edited by Thefbomb13; 01-03-2018 at 05:01 PM.
#4
New Member
iTrader: (1)
Dry is dry. Just compression test it.
Wet test is when you drip a little bit of oil onto the piston rings and do it again to see if the oil seals the ring gaps.
Also that hose is probably for the PVC boss that goes into your intake. You can delete it to help prevent crank case pressure or plug it back in. It's mostly for emissions. I'm running mine vented with my turbo kit. It's up to you.
Wet test is when you drip a little bit of oil onto the piston rings and do it again to see if the oil seals the ring gaps.
Also that hose is probably for the PVC boss that goes into your intake. You can delete it to help prevent crank case pressure or plug it back in. It's mostly for emissions. I'm running mine vented with my turbo kit. It's up to you.
#6
New Member
iTrader: (1)
Wet is to test the piston rings and cylander walls.
If you do a wet test and you gain compression over a dry, you are having pressure escape past your rings. Because the oil will seal those gaps increasing pressure.
If it's the same as a dry test or with in a couple psi your rings and cylinders are sealed properly and aren't letting pressure to enter your crank case.
Edit: also shows for valve seal and head gasket leaks but most the time it really shows if your cylander is worn or not sealing.
If you do a wet test and you gain compression over a dry, you are having pressure escape past your rings. Because the oil will seal those gaps increasing pressure.
If it's the same as a dry test or with in a couple psi your rings and cylinders are sealed properly and aren't letting pressure to enter your crank case.
Edit: also shows for valve seal and head gasket leaks but most the time it really shows if your cylander is worn or not sealing.
Last edited by CK_32; 01-04-2018 at 02:45 PM.
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Thefbomb13 (01-04-2018)
#7
Registered User
Thread Starter
Say my seals, head gaskets, cylinders are all good.. then what do you think the culprit of an overfilling catch can would be?
thanks for the info by the way!
thanks for the info by the way!
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#8
New Member
iTrader: (1)
Could be a number of things, some Z owners literally chase that down for years. But it's not just to Nissan, it plagues all sorts of different cars. Many cars see this in boost. Some people find a solution, some never do.
I'd start with putting a small pod filter on the open hose behind the intake. Then do a leak down and see what we get before we explore the rabbit hole.
I'd start with putting a small pod filter on the open hose behind the intake. Then do a leak down and see what we get before we explore the rabbit hole.
#9
New Member
First thing I'd check before doing all the compression testing b.s. would be to check the pcv valve. Dude has this chepo c.c. vented, so he may have removed the pcv guts. That's typical for someone who might vent to the atmosphere.
#11
Registered User
Thread Starter
I think it would have to be plugged for this to be the cause? If it was just open wouldn’t I just get misfires?
#12
Registered User
Thread Starter
Could be a number of things, some Z owners literally chase that down for years. But it's not just to Nissan, it plagues all sorts of different cars. Many cars see this in boost. Some people find a solution, some never do.
I'd start with putting a small pod filter on the open hose behind the intake. Then do a leak down and see what we get before we explore the rabbit hole.
I'd start with putting a small pod filter on the open hose behind the intake. Then do a leak down and see what we get before we explore the rabbit hole.
Which open hose behind the intake?
#13
New Member
If the guts in the pcv are missing, it's wide open and the vacuum via intake is going to town. Crank case ventilation would have nothing to do with misfires.
#14
Registered User
Thread Starter
So you’re saying vacuum created by intake that the pcv is suppose tobe regulating is pulling oil from my valve covers into the catch can?
#15
New Member
Vacuum via intake is what positive crank case ventilation is all about. On the drivers side fresh air is drawn through a connection on the intake pipe then into the crank case, though the passenger side valve cover, then through the pcv valve and finally into the lower collector. The lower collector or intake plenum pulls this air in through the crank case via the intake pipe.
#16
Registered User
Thread Starter
Makes sense now!
I also forgot to mention that the Z was turbo’d by the previous owner.. so it would make sense for them to have gutted the PCV. Obviously the catch can oil fills under load, so there’s no real way to test it until I have a track day. Ugh
I guess I’ll have to check that out and maybe run another compression test.
I also forgot to mention that the Z was turbo’d by the previous owner.. so it would make sense for them to have gutted the PCV. Obviously the catch can oil fills under load, so there’s no real way to test it until I have a track day. Ugh
I guess I’ll have to check that out and maybe run another compression test.
#17
New Member
Makes sense now!
I also forgot to mention that the Z was turbo’d by the previous owner.. so it would make sense for them to have gutted the PCV. Obviously the catch can oil fills under load, so there’s no real way to test it until I have a track day. Ugh
I guess I’ll have to check that out and maybe run another compression test.
I also forgot to mention that the Z was turbo’d by the previous owner.. so it would make sense for them to have gutted the PCV. Obviously the catch can oil fills under load, so there’s no real way to test it until I have a track day. Ugh
I guess I’ll have to check that out and maybe run another compression test.
#18
Registered User
Thread Starter
Alright so I checked my pcv, it still has its guts and it seems as if it’s opening and closing fine.
But it when I went to take a pic of a pipe coming off the intake that I plugged I found another one that is not plugged at all.. tell me what you think..
But it when I went to take a pic of a pipe coming off the intake that I plugged I found another one that is not plugged at all.. tell me what you think..