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#51
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The reason the omp has a vac line is so it won't get clogged and it's just easiest to do that after the air filter so they ran vac line to it. Take your own risks on venting (not too large though)
what is FI?
what is FI?
#52
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Originally Posted by Sesshoumaru
The reason the omp has a vac line is so it won't get clogged and it's just easiest to do that after the air filter so they ran vac line to it. Take your own risks on venting (not too large though)
what is FI?
what is FI?
#54
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Originally Posted by Sesshoumaru
no.
can't vent that. You'd have a vac leak.
it's to allow air to bypass the butterfiles for the primaries
can't vent that. You'd have a vac leak.
it's to allow air to bypass the butterfiles for the primaries
There are two orings/insulators that are located where the primary injector block engages with the center plate. These are to seal the connection from having a vacuum leak. This is also where the air is supplied to. Is this supposed to seal under vacuum and only allow air to be pushed in under boost but not drawn in under vacuum? Any ideas?
Mike
#55
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Originally Posted by MFilippello
This is what confusses me about this yellow line. From the factory it is connected to a nipple on the crossover pipe which places it on the discharge side of the turbos. At idle you would have a vauum leak as implimented by the factory. I see no difference as opposed to just leaving it open when not in boost. When in boost, you would pressurise the line thus accomplishing something. At idle I have to assume there would be a vacuum leak but this is the way it is stock so it must somehow work. It needs to be connected but what is the design plan in regards to the vacuum leak.
#56
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Originally Posted by MFilippello
There are two orings/insulators that are located where the primary injector block engages with the center plate. These are to seal the connection from having a vacuum leak. This is also where the air is supplied to. Is this supposed to seal under vacuum and only allow air to be pushed in under boost but not drawn in under vacuum? Any ideas?
Mike
Mike
#57
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hmmm, this is quite the interesting post... i just recently installed an rx6 kit and i capped ALL of the stock vacum lines that connected anywhere on the stock twins. been running like that for over a month now with no problems... do i have to reconnect some lines or am i fine?
#58
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depends on what you left.
you could have as few as 6 vac lines (bov,map,fpr,wg,injector bleeder,brake booster).
-oh and MFilippello that's the purpose for the yellow line. To draw air in before the butterflies so that's why it's before the tb. When the butterflies are shut not enough air is getting sucked in on the primary ports to properly atomize all the fuel down low.
The preset map uses pressure and rpms to calcuate fuel (and a few others like fuel/water/intake temps). If the pressure is artificially low due to a leak it won't use the correct points. Pretty sure the pressure maps are in accordance with that line being so and that why it doesn't look like a vac leak to the engine.
you could have as few as 6 vac lines (bov,map,fpr,wg,injector bleeder,brake booster).
-oh and MFilippello that's the purpose for the yellow line. To draw air in before the butterflies so that's why it's before the tb. When the butterflies are shut not enough air is getting sucked in on the primary ports to properly atomize all the fuel down low.
The preset map uses pressure and rpms to calcuate fuel (and a few others like fuel/water/intake temps). If the pressure is artificially low due to a leak it won't use the correct points. Pretty sure the pressure maps are in accordance with that line being so and that why it doesn't look like a vac leak to the engine.
Last edited by Sesshoumaru; 10-17-04 at 10:10 PM.
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ok well clearly my HKS BOV has a vac line and the wastegate is plumbed properly as well. now the map sensor was never gettin its pressure reading from the stock twins nor the brake booster. but now where did the FPR and injector bleeder plumb into the stock twins?
#61
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that pipe always has positive pressure...if the turbo is spinning air is flowing...might not be a lot, but definitely not a vacuum leak.
Originally Posted by MFilippello
This is what confusses me about this yellow line. From the factory it is connected to a nipple on the crossover pipe which places it on the discharge side of the turbos. At idle you would have a vauum leak as implimented by the factory. I see no difference as opposed to just leaving it open when not in boost. When in boost, you would pressurise the line thus accomplishing something. At idle I have to assume there would be a vacuum leak but this is the way it is stock so it must somehow work. It needs to be connected but what is the design plan in regards to the vacuum leak.
There are two orings/insulators that are located where the primary injector block engages with the center plate. These are to seal the connection from having a vacuum leak. This is also where the air is supplied to. Is this supposed to seal under vacuum and only allow air to be pushed in under boost but not drawn in under vacuum? Any ideas?
Mike
There are two orings/insulators that are located where the primary injector block engages with the center plate. These are to seal the connection from having a vacuum leak. This is also where the air is supplied to. Is this supposed to seal under vacuum and only allow air to be pushed in under boost but not drawn in under vacuum? Any ideas?
Mike
#62
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Originally Posted by Sesshoumaru
The oil is pulled up by the intake stroke of the engine.
Originally Posted by Sesshoumaru
the electronic omp's use a stepping motor and do no pumping like previously mentioned.
It does not rely on oil pressure. If you trace it back on the front cover it is fed by an oil return line.
The OMP is in fact supplied with engine oil pressure and it is engine oil pressure which drives the oil through the tubes and into the motor. The oil metering pump does just that; it meters the oil through a rotating gate. Here is how the OMP works:
FD OMP oil metering pump function
Last edited by DamonB; 11-03-04 at 07:04 PM.
#63
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The line in the front cover is a return line and does have some pressure.
I can see with higher rpm it would be forced in with the higher oil pressure (addressing boost). If this was true for all rpm then the vac line wouldn't be needed.
Why is the vac line part of the designed if it's jsut forced in? I didn't see the mention of the vac lines in that thread.
I can see with higher rpm it would be forced in with the higher oil pressure (addressing boost). If this was true for all rpm then the vac line wouldn't be needed.
Why is the vac line part of the designed if it's jsut forced in? I didn't see the mention of the vac lines in that thread.
#64
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Originally Posted by Sesshoumaru
Why is the vac line part of the designed if it's jsut forced in? I didn't see the mention of the vac lines in that thread.
The vac lines on the oil injectors are plumbed directly to the intake with no valves or anything in between and so vacuum is present here 100% of the time (engine running of course). If the vacuum is some how pulling oil up the tubes then the oil still wouldn't make it into the motor as the vaccum line would suck it right out of the injector the moment the oil got there and then send it through the intake.
#67
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There is a check valve (diaphram) in the injector that doesn't allow oil in the vac lines like mentioned earlier in this thread. This is evedent also by the use of a vac line. I never once implied oil flowed through the vac line.
https://www.rx7club.com/showthread.p...t=omp+injector
If they have nothing to do with the oil injection system then why are they even there (on all series). I still think they serve as bleeds like the injectors.
https://www.rx7club.com/showthread.p...t=omp+injector
If they have nothing to do with the oil injection system then why are they even there (on all series). I still think they serve as bleeds like the injectors.
#68
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if oil is indeeded forced through the injectors how does these work
https://www.rx7club.com/showthread.p...=omp+Reservoir
the premix isn't under pressure
https://www.rx7club.com/showthread.p...=omp+Reservoir
the premix isn't under pressure
#69
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Originally Posted by Sesshoumaru
If they have nothing to do with the oil injection system then why are they even
there (on all series). I still think they serve as bleeds like the injectors.
Originally Posted by Sesshoumaru
if oil is indeeded forced through the injectors how does these work
https://www.rx7club.com/showthread.p...=omp+Reservoir
the premix isn't under pressure
https://www.rx7club.com/showthread.p...=omp+Reservoir
the premix isn't under pressure
Just to make sure I'm not running in circles you do agree that the engine does not suck the oil up the tubes as you said earlier? Let's agree on that first and then I'll correct my earlier mis-statement about oil supply and pressure from the OMP...
Last edited by DamonB; 11-04-04 at 02:27 PM.
#70
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Originally Posted by DamonB
Since there is vacuum behind this diaphram (when hooked to the inlet as designed) two things happen: At the instant of startup the initial vac on the diaphram will help pull oil to the injector (imagine drawing back a very small syringe and then holding it there). Once the engine is shut off vacuum is gone and the diaphram then returns to rest and seals over the end of the oil tube (imagine putting a straw in a glass of water and then putting your finger over the end of the straw). This prevents the oil from siphoning down the tube. If the oil siphons back down the tubes they have to be re-primed the next time the motor is started and thus the engine is starved of OMP oil for a short time.
there would be no vacuum with an efficient intake it's more of an "air intake" for the nozzles - it's just atmosphric pressure with clean air.
just as stated in this -It's used as a atomizer
https://www.rx7club.com/showthread.p...t=omp+pressure
(some wrong info in there though)
Last edited by Sesshoumaru; 11-04-04 at 03:18 PM.
#71
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i guess my stance is closer to CCarlisi ideas in this thread
https://www.rx7club.com/showthread.p...t=omp+pressure
https://www.rx7club.com/showthread.p...t=omp+pressure
#72
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(not going to run in circles)
I agree on the nozzles though. Just checked the FSM and they allow airflow into the motor but not out. The vac line to the nozzle allows an alternate path to the nozzle under vacuum so that the motor doesn't draw too much oil up the tubes. If you were to cap the vac attachment on the nozzles the motor would get too much OMP oil when a vacuum is present in the chamber as without an alternate path to draw from it would suck up too much OMP oil. The engine is not to be allowed to draw oil up the tubes, only for the OMP to send it.
The presence of the one way valves in the OMP nozzles proves without a doubt that the engine cannot pull oil up the tubes via vaccum. The one way valves would provide a leak path to ensure that cannot happen.
Originally Posted by DamonB
Just to make sure I'm not running in circles you do agree that the engine does not suck the oil up the tubes as you said earlier?
I agree on the nozzles though. Just checked the FSM and they allow airflow into the motor but not out. The vac line to the nozzle allows an alternate path to the nozzle under vacuum so that the motor doesn't draw too much oil up the tubes. If you were to cap the vac attachment on the nozzles the motor would get too much OMP oil when a vacuum is present in the chamber as without an alternate path to draw from it would suck up too much OMP oil. The engine is not to be allowed to draw oil up the tubes, only for the OMP to send it.
The presence of the one way valves in the OMP nozzles proves without a doubt that the engine cannot pull oil up the tubes via vaccum. The one way valves would provide a leak path to ensure that cannot happen.
Last edited by DamonB; 11-05-04 at 08:12 AM.
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