2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Crankcase Ventilation

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Old Sep 12, 2007 | 12:03 AM
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dwb87's Avatar
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Crankcase Ventilation

Would there be a problem if I ran a line straight from the oil filler neck nipple to the TID? and another line straight from the nipple on the center iron, near bottom of oil filler neck, to The TID? Could oil possibly over flow into the TID or not?
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Old Sep 12, 2007 | 01:21 AM
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Why the hell would you run that garbage back into your intake so it can befoul your turbo blades and throttle body? Just get a catch bottle with breather filter and run from the nipple on the oil filler neck into that. You should see the disgusting crap that I empty out of mine at track events.
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Old Sep 12, 2007 | 09:31 AM
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Originally Posted by dwb87
Would there be a problem if I ran a line straight from the oil filler neck nipple to the TID? and another line straight from the nipple on the center iron, near bottom of oil filler neck, to The TID? Could oil possibly over flow into the TID or not?
Yes, there would.

Under boost plenty of oil can be forced out of that line and it will cause smoke.

The proper arrangement is to run the nipple on the middle iron to the TID, then run the nipple on the filler neck through a PCV valve (or the stock purge valve) to a vacuum source.

If you find yourself blowing a lot of oil into the TID, you will need a catch can between the iron and TID.
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Old Sep 12, 2007 | 10:02 AM
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Will I need a check valve for the line coming from the center iron?
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Old Sep 12, 2007 | 10:34 AM
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Nope. The PCV valve on the oil filler takes that job.
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Old Sep 12, 2007 | 10:55 AM
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Thanks a lot Aaron... I appreciate it!
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