turbo bearing smoke
07-01-2002, 10:37 AM
#4
Nordschleife Master
Thread Starter
[quote]Originally posted by special tool:
<strong>Luke - block pics yet?</strong><hr></blockquote>
WEll I also have quite a bit of oil in my intake tract. ( about four tims what I used to have
) I hope this turbo is ok. it only has about 2k miles on it for ch@&t sake 
If rings were the issue, wouldn't I be blowin' more smoke under a load? I see *NOTHING under a load and *NOTHING on deccelloration
If I keep oil pressure at around 4bar (1200 rpm) it does smoke <img src="confused.gif" border="0">
<strong>Luke - block pics yet?</strong><hr></blockquote>
WEll I also have quite a bit of oil in my intake tract. ( about four tims what I used to have
) I hope this turbo is ok. it only has about 2k miles on it for ch@&t sake If rings were the issue, wouldn't I be blowin' more smoke under a load? I see *NOTHING under a load and *NOTHING on deccelloration
If I keep oil pressure at around 4bar (1200 rpm) it does smoke <img src="confused.gif" border="0">
07-01-2002, 01:25 PM
#5
Race Director
Hmm smoke at idle but not under acceleration? That's bizarre...
Oil in the intake could be from the crankcase breather. If you have too much blowby past the rings, it'll blow oil out the breather through the intake of your turbo. At which point, you can't tell where the oil came from.
I'd do a compression check to test the rings to see what condition they are in. Then we can eliminate or pinpoint that as a cause.
Oil in the intake could be from the crankcase breather. If you have too much blowby past the rings, it'll blow oil out the breather through the intake of your turbo. At which point, you can't tell where the oil came from.
I'd do a compression check to test the rings to see what condition they are in. Then we can eliminate or pinpoint that as a cause.
07-01-2002, 02:52 PM
#6
Race Car
Turbo lubrication supply comes from or drains to the left hand (drivers) balance shaft...?
Hmm, can't remember what the direction of turbo lube flow is, but if it returns to the RH balance shaft bearing a damaged bearing (smeared) could be blocking the drainback effect.
Keep in mind that there's a vacuum present at idle, which could clue you in as to the source.
What is your oil consumption rate Luke....?
Our turbo's are virtually the same spec, and it's quite possible there are manufacturing tolerance differences. I'm having no trouble, but only with 500 miles so far, but 499 of them ON boost.
If the oil drainback from the turbo goes through the pedestal instead of the balance shaft route, are you sure you didn't place a towel or a piece of a rag in the drainback tract while your car was disassemble to insure no debris got in there....?
Check that the drainback is free and clear....
Good luck
Hmm, can't remember what the direction of turbo lube flow is, but if it returns to the RH balance shaft bearing a damaged bearing (smeared) could be blocking the drainback effect.
Keep in mind that there's a vacuum present at idle, which could clue you in as to the source.
What is your oil consumption rate Luke....?
Our turbo's are virtually the same spec, and it's quite possible there are manufacturing tolerance differences. I'm having no trouble, but only with 500 miles so far, but 499 of them ON boost.
If the oil drainback from the turbo goes through the pedestal instead of the balance shaft route, are you sure you didn't place a towel or a piece of a rag in the drainback tract while your car was disassemble to insure no debris got in there....?
Check that the drainback is free and clear....
Good luck
07-01-2002, 04:53 PM
#7
Nordschleife Master
Thread Starter
Drain back is free and clear.
Oil consumption is still surprisingly within factory tolerances, at about 3/4 per 1000 miles. It used to be MUCH less
Oil consumption is still surprisingly within factory tolerances, at about 3/4 per 1000 miles. It used to be MUCH less