View Poll Results: Do you need/have a crank case vacuum?
Yes, I have a vacuum on my crank case
6
33.33%
No, My crank case is open to the atmosphere
12
66.67%
Voters: 18. You may not vote on this poll
Crankcase ventilation/vacuum do you use/need a vacuum?
Crankcase ventilation/vacuum do you use/need a vacuum?
So this question was being discussed at out monthly club meeting last night, and I've seen people posting about needing a vacuum on the crank case for the purpose of "sucking the oil out of the turbo"
Obviously you can't have a "closed" crank case because the blow-by will cause pressure to build up and blow oil pan gaskets out ect.
And if you have a vacuum on your crankcase, please explain how it works.
Do you get vacuum from the intake manifold only with a one-way valve? (no vacuum under boost)
Or, do you you have a line going to a tap on the turbo inlet (vacuum only under boost)
Or both?
Please explain your answer choice, help us figure out which is better and why
Obviously you can't have a "closed" crank case because the blow-by will cause pressure to build up and blow oil pan gaskets out ect.
And if you have a vacuum on your crankcase, please explain how it works.
Do you get vacuum from the intake manifold only with a one-way valve? (no vacuum under boost)
Or, do you you have a line going to a tap on the turbo inlet (vacuum only under boost)
Or both?
Please explain your answer choice, help us figure out which is better and why
The stock FD system works with the crankcase (via the oil filler neck) fed to the inlet of the turbo. This area is never under positive pressure so you do not need a valve.
For racing purposes people (including me) ventilate the pressure by either tapping into the passenger side of the front cover, or using the stock oil return flange as a vent. It's important that you vent both sides of the engine, so one from the filler neck and the other from the front cover/turbo drain. Remember that if you route these vent lines to a catch can it must be a vented can otherwise you are just moving the pressure point and not achieving much.
For racing purposes people (including me) ventilate the pressure by either tapping into the passenger side of the front cover, or using the stock oil return flange as a vent. It's important that you vent both sides of the engine, so one from the filler neck and the other from the front cover/turbo drain. Remember that if you route these vent lines to a catch can it must be a vented can otherwise you are just moving the pressure point and not achieving much.
I run a line from the center iron vent to a catch can (vented) and one from the oil filler neck to the same can. Only accumulates oil if you're flogging the **** out of it.
Effectiveness vs. other methods? No idea I've only ran like this since I went single.
Any oil issues with my engine(s)? Oil control rings are always fine, no smoke under boost/decel. Only oil related issue I'm seeing is fuel contamination but don't know if thats related to how it vents at all.
Effectiveness vs. other methods? No idea I've only ran like this since I went single.
Any oil issues with my engine(s)? Oil control rings are always fine, no smoke under boost/decel. Only oil related issue I'm seeing is fuel contamination but don't know if thats related to how it vents at all.
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ls1swap
3rd Generation Specific (1993-2002)
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Jun 3, 2024 03:25 PM
