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Registered:
June 2003
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SmOkIn
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Mon, 26 April 2004 09:01
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yeah, having probs with my 3tgteu, put a rb20det turbo on it running 5psi.. same performance as ct20 @ 8psi. very nice.
It starts blowing what would appear to be white/grey smoke, there is no smoke at idle, and no smoke up untill about 3500 in 1st and 2nd and 3rd, however in 5th i can plant it at 100k and come upto full boost for 10-20 seconds and see no smoke at all, its not as noticeable in day, but at night with headlights behind you its very noticeable and its quite a bit of smoke.
A compression test resulted in 145psi on every cyclinder, i just went outside with the torch and had someone rev it to 3500rpm for about 20-30secs, not a sign of smoke at all.. nothing nudda
the funny thing is it did it with the old turbo as well, but since there was so much oil in the intake i always thought it must have been the turbo, however its nowhere near as much now as it used to be with ct20.
WTF could it be? only other thing i can think of is overfuelling, but thats ment to be black!?
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Registered:
June 2003
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Re: SmOkIn
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Mon, 26 April 2004 09:05
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oh and oil return or crankcase pressure is not a issue.
however with the crankcase venting to atomshere and currently having no rubber around the gearstick i can see a fine mist of smoke coming from the engine bay into the car on acceleration, im told this is normal tho.,
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Location:
Brisbane
Registered:
February 2003
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Re: SmOkIn
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Mon, 26 April 2004 09:20
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what condition are plugs in? oiled up or petrol soaked?
is the PCV system plumbed up correctly - nope- you say it's vented to atmosphere? then that fine mist you see is probably blowby and crankcase fumes - you should really be feeding that back into the motor as designed - or at least via a oil catch can.
when you did compression test did you do a dry/wet test?
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Registered:
June 2003
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Re: SmOkIn
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Mon, 26 April 2004 09:25
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| thechuckster wrote on Mon, 26 April 2004 19:20 |
what condition are plugs in? oiled up or petrol soaked?
is the PCV system plumbed up correctly - nope- you say it's vented to atmosphere? then that fine mist you see is probably blowby and crankcase fumes - you should really be feeding that back into the motor as designed - or at least via a oil catch can.
when you did compression test did you do a dry/wet test?
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you the fine mist is the blowby and crankcase fumes, im aware of that.
and accidently i spilled quite a bit(3-4 full teaspoons perhaps) into cyclinder one then i deceided i'd repeat the test, got 180psi...
but the first time i did it straight after a decent run and got like 145,143,146,145psi .. spark plugs are pitch black, but not wet..exhuast is crazy black also.
But i would think overfuelling would be far easier to see, as ive had a leaking bov beofre, and it did appear very black, ive actaully blocked up the bov just to test that its not that this time.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: SmOkIn
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Mon, 26 April 2004 12:36
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Did you use the oil restrictor on the turbo....
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Registered:
June 2003
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Registered:
June 2003
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: SmOkIn
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Mon, 26 April 2004 13:51
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If a dry test is ok, a wet test will be ok also.
Looks like its somthing else...
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Registered:
June 2003
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Location:
Brisbane
Registered:
February 2003
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Re: SmOkIn
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Mon, 26 April 2004 14:25
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significant increase (e.g. more that 10-15psi) when wet tested usually indicate leaking rings - or at least leaky combustion chamber.
but the fact that the intital dry readings were consistent (should be no more than 5psi dif between pots) and high throws theory A into some doubt.
are there any error codes from the ECU? this runs an 02 sensor? if so, is it OK?
Is the black coating carbon (e.g. pooly burnt petrol) or oily (stuffed rings/something)?
is timing OK?
do exhaust fumes have high petrol odour?
R u sure it's white not blue-white smoke?
Have you gone over engine and tightened/checked electrical and plumbing connections?
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Registered:
June 2003
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Re: SmOkIn
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Mon, 26 April 2004 14:34
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-3t doesnt have error codes, the oxygen sensor is not hooked up as it has a custom 2.5" downpipe/1" wastegate pipe and 3" exhuast with no cat, and single muffler at the rear.
-Oxygen sensor wont matter a pinch when I keep my foot planted upto 3.5k-4k then it starts smoken. as it will not be in closed loop mode.
-Last time timing was checked, it was stock timing.
-Hard to tell the color of the smoke, would deffinatly appear to be white.
-The blackness in the exhuast is carbon for sure. rich carbon, as when i run my finger across it, my fingers black and its not greasy at all. sorta like a fine sand ;p
-Deffinatly a odd smell from the exhuast, however i wouldnt know what burning oil from the exhuast smells like, i'd be inclinded to say the smell would be the richness tho.
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: SmOkIn
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Mon, 26 April 2004 20:16
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did it happen at all before you put the rb20bb turbo on there? if not then i'd suggest the seals in the replacement turbo might be on their way out...
from your comp test readings your engine seems fine. don't put too much oil down the bores or you may end up hydraulic lock and that can be quite harmful.
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