Would this have made me smoke (vent prob)..?
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silver ghost
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Would this have made me smoke (vent prob)..?
this is my at my set-up.. (full non-seq) and crankcase vent. check valve eliminated (93). I noticed that the line running from the bottom of the oil fill neck to the hard line was connected (@ the other end of the hard line) to the "t" that runs under the UIM to the vacuum side..WTF? The other end of the hard line is supposed to run to the nipple of the intake side of the primary while the other nipple (of the intake side of primary) is supposed to run to the "t" connector.. On a side note the top nipple of the oil fill neck is vented to atmosphere and i took off the oil neck cap and still was smoking a bit .. Now do I need to clean the oil out of those vacuum lines or will it do it itself? Eg. brake cleaner.. Please help.. Thanks Garret..
Last edited by G's 3rd Gen; 06-07-05 at 07:26 PM.
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silver ghost
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well i took it for a drive... still smoke on decel and when i pull outta gear. Def. oil smoke light blueish..Not losing any coolant. Have another set of turbos on the way.. i hope that cures it. Only 6k on this rebuild (all new parts). Better not be engine oil seals.. Or heads will roll..
Last edited by G's 3rd Gen; 06-07-05 at 08:07 PM.
#3
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If you want to clean your vacuum lines, I wouldn't recommend using brake cleaner. It's pretty corrosive.
In addition, do you understand what a PCV valve does? I can't think of any reason to remove it, at least for a piston engine. It's possible that the the rotary doesn't need to releive pressure at that point, but why did Mazda put it there?. Also, I'm pretty sure you'll want to keep the check valve in that line.
-s-
In addition, do you understand what a PCV valve does? I can't think of any reason to remove it, at least for a piston engine. It's possible that the the rotary doesn't need to releive pressure at that point, but why did Mazda put it there?. Also, I'm pretty sure you'll want to keep the check valve in that line.
-s-
#4
it will need to be vented at least. not hooked to a manifold vac source. manifold vac becomes maniflod boost. boost into the case is not good. you can run it to the inlet elbow on the turbo as that is the only place that sees constant vac. the pcv valve was a check valve to prevent boost from going into the case. a catch can to the turbo inlet is ideal as it will stop the oil blow-by from getting all inside the intake tract.
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Eeehh
The guys above are right, you are essentially now pressurizing the filler neck....put the PCV valve in or remove the line completely and cap the filler neck and UIM nipples -- this is how 95+ FDs are setup.
The guys above are right, you are essentially now pressurizing the filler neck....put the PCV valve in or remove the line completely and cap the filler neck and UIM nipples -- this is how 95+ FDs are setup.
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silver ghost
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Originally Posted by rynberg
Eeehh
The guys above are right, you are essentially now pressurizing the filler neck....put the PCV valve in or remove the line completely and cap the filler neck and UIM nipples -- this is how 95+ FDs are setup.
The guys above are right, you are essentially now pressurizing the filler neck....put the PCV valve in or remove the line completely and cap the filler neck and UIM nipples -- this is how 95+ FDs are setup.
#7
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well i just pulled off all the accesories to the turbos and inspected the primary and secondary intake sides. Feels real good minimal side to side and no front to back shaft play. No oil in either intake side of the turbines or piping. This is starting not to look good as I am suspecting engine oil seal problems. I will take them off and slap the new ones on to see if it cures the smoke.. Wish me luck..
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#8
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Stock twins although not extremely likely can also go bad at the exhaust side (secondary turbine) and leak oil right into the exhaust burning it off before its able to cause any drip or leakage.
I had this happen to me with 110k miles on oem turbos. The primary had minimal shaft play, but sure enough secondary was worse off. Had me going nutts at first bec. all the IC piping and intake piping showed no sign of excess oil.
I had this happen to me with 110k miles on oem turbos. The primary had minimal shaft play, but sure enough secondary was worse off. Had me going nutts at first bec. all the IC piping and intake piping showed no sign of excess oil.
#9
Originally Posted by rynberg
Eeehh
The guys above are right, you are essentially now pressurizing the filler neck....put the PCV valve in or remove the line completely and cap the filler neck and UIM nipples -- this is how 95+ FDs are setup.
The guys above are right, you are essentially now pressurizing the filler neck....put the PCV valve in or remove the line completely and cap the filler neck and UIM nipples -- this is how 95+ FDs are setup.
Thanks in advance.
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you can't cap both nipples on the oil filler neck thoguh right? Cause then crankcase pressure has no where to go. Can you just leave one open to atmostphere or run a line to a catch can and thats it, instead of running another one from the catch can to the turbo inlet? Basically can it just be left open to vent or does it need to be pulled out by some vacuum source?
Also on a side note, how many o-rings are supposed to be where the filler neck connects to the block?
Also on a side note, how many o-rings are supposed to be where the filler neck connects to the block?
#11
a vac ONLY source is ideal. thus the turbo inlet, or use of a pcv/check valve when using the manifold. the catch can does just that catches the oil droplets and seperates them from the air so you do not get oil streaking the manifold,turbos etc... iirc there is one rather large o ring that seals it to the block, 2 10 mm bolts on the sides. you could just let it vent but it will spray everywhere.
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Originally Posted by mad_7tist
a vac ONLY source is ideal. thus the turbo inlet, or use of a pcv/check valve when using the manifold. the catch can does just that catches the oil droplets and seperates them from the air so you do not get oil streaking the manifold,turbos etc... iirc there is one rather large o ring that seals it to the block, 2 10 mm bolts on the sides. you could just let it vent but it will spray everywhere.
#14
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inlet(vac only) ---> catch can <----lower nipple on oil filler neck.
cap the top one (and the UIM).
95's only had a vacuum line from the oil filler neck to before the turbo inlet for any venting. My emission's numbers improved after installing the catch can...other mods went in at the same time too however, total decrease was 50% with new cat, AMP, catch can, lower fuel pressure and bigger timing split.
cap the top one (and the UIM).
95's only had a vacuum line from the oil filler neck to before the turbo inlet for any venting. My emission's numbers improved after installing the catch can...other mods went in at the same time too however, total decrease was 50% with new cat, AMP, catch can, lower fuel pressure and bigger timing split.
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yes I understand peopel run it through a catchcan but my question is: is the vacuum source needed and why? If the purpose is to vent pressure this will be done on it's own without the assistance of vacuum. Using vacuum to "suck" out the pressure would just increase the likelyhood of sucking up the oil that sloshes around in the filler neck.
I want to avoid additional vacuum lines and also injesting air with an unmeasured amount of oil/gas vapor which could possible affect tuning.
BASICALLY: Someone explain to me why a vacuum is needed to vent the crankcase.
I want to avoid additional vacuum lines and also injesting air with an unmeasured amount of oil/gas vapor which could possible affect tuning.
BASICALLY: Someone explain to me why a vacuum is needed to vent the crankcase.
#16
development
the way I see it is it relieves some pressure, I've known people who just vent them. If you plug those two filler neck nipples...engine most likely will smoke.
you have a pressure source; the crankcase
you have a vacuum source; the turbo
the higher the rpms the higher the crankcase pressure to a regulated point. (oil gets to about ~120psi; not sure about the crankcase)
just so happens the higher the rpms the high the vacuum (due to boost) up to another regulated point. (say 17psi pushing 52lbs/min can produce [I really have no idea, but to be simple...]~60in-hg.)
you can have a pressurized system static with a force feeding it, or you can put that system on a see-saw...while cleaning up some blow by vapors
two vacuum lines won't complicate your set-up too much
can't see a thing
you have a pressure source; the crankcase
you have a vacuum source; the turbo
the higher the rpms the higher the crankcase pressure to a regulated point. (oil gets to about ~120psi; not sure about the crankcase)
just so happens the higher the rpms the high the vacuum (due to boost) up to another regulated point. (say 17psi pushing 52lbs/min can produce [I really have no idea, but to be simple...]~60in-hg.)
you can have a pressurized system static with a force feeding it, or you can put that system on a see-saw...while cleaning up some blow by vapors
two vacuum lines won't complicate your set-up too much
can't see a thing
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