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Location:
cambo
Registered:
May 2002
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sc12 using HEAPS of oil.
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Mon, 27 October 2003 09:26
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i asked on this forum not long ago if anyone knew the possible cause of my s/c using its entire 130ml or so of oil in approx 2 days but i never really made an effort to investigate further cause i was too lazy to take it off.
it does not leak any oil that i can see, so i assumed it was using it through the engine possibly by a blown seal. now that i have gone through my book on the AW11 covering the 4agze (which i think is the same as the other versions of thre 4agze) i have discoverd that there are no seals in the charger whatsoever, only three gaskets. but if the gaskets were leaking, the oil would leak out of the s/c rather than go into the combustion chamber. how is this possible? im a bit reluctant to remove the s/c due to the difficulty and i doubt it will be cheap/easy to get replacement gaskets for it. any ideas?
cheers, kevin.
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 02:32
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are your pressure hoses to the inlet manifold hooked up correctly (the 3 hoses coming out of the s/c and onto the inlet manifold)???
these hoses equalise the pressure across the s/c when it is switched off at idle, and if you don't have them hooked up you get a similar problem as drawthru turbo applications where if you don't use a carbon front seal and the butterfly is shut the engine sucks the oil out of the turbo core thru the compressor seal.
you may be having a similar problem, so check those hoses. a lot of workshops just blank them off and this is a no go.
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 05:55
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ill have to check that tomoz when i have a day off work. it looks like its all hooked up correctly, however the browny-red plug ontop of the s/c with the 3 hoses isnt connected and i thought this was due to having an aftermarket ecu. does it require this valve to equalise the pressure?
also i have a solid pulley on the s/c which raises the boost to 15psi so its always on anyway. but i think your onto something here with the suction... cause at idle with the throttle closed the intercooler hoses really suck in, so its probably sucking the oil out.
just incase my hoses ARE hooked up correctly, is there some other way to equalise the pressure so the oil doesnt get sucked out if this is the problem? (which it sounds like)cheers, kevin.
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Location:
Melb
Registered:
June 2002
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 05:59
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you wont get replacements for the charger, you'll have to by another one
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 06:00
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it won't be anything else if the hoses are sucking in as you say.
there is a massive pressure differentiation between before and after the s/c if the engine is sucking THAT hard.
those hoses need to run to the inlet manifold, you should have the lugs sitting there waiting to be connected. it doesn't have to be any kind of pressure rated hose, hell, garden hose will do it until you can get around to buying some good stuff.
hook them up and see the difference and let us know how you went.
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 07:17
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yeah getting hose isnt the problem i got heaps at work, but there are a few hoses coming from the s/c, and like i mentioned 3 go to the brown valve. i dont think i got a diagram of the s/c hoses in my book but ill double check, other than that all i can do is look for pics on the net to see how the hoses differ from mine, that is if mine arent already hooked up.
shoulda checked with someone elses on the megacruise 
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 07:19
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don't freak out, it's an easy fix.
just check your inlet manifold for 3 blanked off lugs and unblank them and hook those 3 hoses up to them.
someone's gotta have a picture on here somewhere...c'mon fellas.
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 07:31
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it would need to be bellow the throttle butterfly to work wouldnt it? also, wouldnt it be some other hoses cause the hoses on the valve look to be in stock locations but i spose if the other have been removed they will do the job in anycase.
btw thanks onjayzed youve been a great help 
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 07:37
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yeah no worries man.
it's been ages (read: years) since i've looked at either a stock 4A or 1G (im used to retro fitting the SC14 onto other engines like std 12A rotaries and L series datto engines) so i'd be unable to advise you there, but being 'below' the throttle body i think means between engine and butterfly? if so, then yes. otherwise i have NFI what you're on about!!!! 
and as far as i can see, there's only one port on the s/c with 3 lugs so hook them up properly.
you can't fk it up coz if you do it just won't idle properly (which is your original prob.).
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Location:
ADELAIDE - Lenswood
Registered:
March 2003
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hmm
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Tue, 28 October 2003 09:31
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do u think this could be my problem with my sc14, as in i cannot get it to idle below 1500rpm..
its really bothering meever since i fitted it to my 4agze, but i have all three hoses off the sc14 going to a brown valve thing then to the top of the throttle body so that would be before the butterfly rather then after it=\
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 09:31
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yeah sorry by bellow the throttle i meant in-between throttle and engine, was just picturing the engine in my head when i said it cause thats the way the piping goes, from above the butterfly.
will let you know how i go, i got a feeling theres gonna be a LOT of oil in the intercooler
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Tue, 28 October 2003 10:14
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 the s/c crancase vents that run to the ACV is plumbed before the thottle body on the gze.
i took mine off completely and had the three piped joined to each other for 2 years at the least. it was documented on a site i read years ago that boost could be lost through the AVC back into the inlet track.
my s/c never used any oil what so ever with the three pipes just joined to each other.
i have seen other s/c's with this done as well.
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Wed, 29 October 2003 00:28
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| feral4mr2 wrote on Tue, 28 October 2003 21:14 |
the s/c crancase vents that run to the ACV is plumbed before the thottle body on the gze.
my s/c never used any oil what so ever with the three pipes just joined to each other.
i have seen other s/c's with this done as well.
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that's interesting. i've hooked them up both ways and found that after the tb i get a better idle and i lose no boost...which could be the case if it runs out of puff after 5000rpm.
similar story i've heard is some bloke running his 12A rotor without oil for 2 years with no probs too...  it's amazing what will work on one car won't work on the other.
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Wed, 29 October 2003 02:53
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well i spose on a 4agze it wouldnt really mater if it where plumbed before or after the throttle body, it is still in a vacum.
they are plumbed before the throttle body from factory.
yeah i have heard people say the s/c runs out of puff after 5000/5500 rpm.
i dunno, my gze kept full boost all the way to 7500 rpm no probs. 
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Wed, 29 October 2003 03:14
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yeah mate i think we're gonna need a pic or two here to work out your problem!!! 
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Wed, 29 October 2003 07:10
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man this is just confusing now. i just went and took some pics but will need a few days to get them developed and scanned.
the brown valve on top of the s/c has 3 hoses going to it. the one at the front goes to a pipe which divides into to and goes to either side of the s/c. one of the hoses on the back of the valve goes to the back of the s/c and the thick hose on the valve goes to the inlet BEFORE the butterfly. does this sound right? it looks stock. however i can see something that has been blocked off after the butterfly.
so what should i do? im think that i should remove the valve (as its not connected anyway) and run 2 hoses going into the s/c to the thick hose that goes to the inlet. should i do this?
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Wed, 29 October 2003 07:12
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dude let us see the photos before we do any diagnosing 
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Location:
Perth
Registered:
September 2003
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Re: sc12 using HEAPS of oil.
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Thu, 30 October 2003 00:42
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i musta missed the fact you have an aftermarket ECU, in which case study the pics because you won't need them. but make sure that ACV is hooked up.
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Thu, 30 October 2003 06:23
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onejayzed, sorry i must have forgot to mention the aftermarket ecu. but you say make sure the ACV valve is hooked up? i dont think thats gonna happen unless i took it to a place that deals with haltechs and get them to wire it into the ecu, and as im a tight ass its even less likely to happen.
feralmr2, so your saying to run the pipes from the front of the s/c to the ones at the back and then just block off the one to ther intake? so all i need to do to equalise pressure is connect the front to the back? i thought the intake would need to be involved somewhere.
just another thought, whats the point of having the hose from the intake anyway? wont that just do what the rest of the intake is doing anyway ie. sucking in oil?
thank you guys both for your help and the effort you's are making. ill try and get my photos developed by this weekend so i can post the pics, but i think it will show its relatively stock 
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Thu, 30 October 2003 10:56
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| EVOSTi wrote on Thu, 30 October 2003 16:23 |
feralmr2, so your saying to run the pipes from the front of the s/c to the ones at the back and then just block off the one to ther intake? so all i need to do to equalise pressure is connect the front to the back? i thought the intake would need to be involved somewhere.
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yes thats what i am saying, i cant find a pic of mine after i did this sorry. once i pulled the ACV off i just joined the front and rear vent pipes together. blocked off the bit where it went into the inlet with a rubber cap.
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just another thought, whats the point of having the hose from the intake anyway? wont that just do what the rest of the intake is doing anyway ie. sucking in oil?
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i have flipped through my manual on the s/c system, there doesnt seem to any mention of the ACV's actual purpose.
i suspect it is to vent any built-up pressure that may arise in the s/c crankcase. at some stage whether it be when at idle of full boost? the ECU must open the soleniod to the intake vacum.
as i said, mine ran no problems with-out it on at all.
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Thu, 30 October 2003 11:25
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i will try it tomoz then leave it a few days and see how the oil level goes.
cheers fellas
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Location:
cambo
Registered:
May 2002
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Re: sc12 using HEAPS of oil.
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Wed, 05 November 2003 05:57
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just letting you guys know that last friday i removed the valve ands connected the front hose from the s/c to the back one and blocked off the inlet pipe. checked it again today and it has used a bit of oil, but not much considering it would use it all in 2 days previously. so ill keep an eye on it regularily for the next couple of weeks and see how it goes, but it looks like its definately made a difference so thanks alot guys
also took of my intercooler and cleaned it out, had some oil in it, but not as much as i expected
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