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The Terminator
Engine/Tuning
03/04 Cobra Vacuum Lines Documented
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<blockquote data-quote="mwolson" data-source="post: 10210519" data-attributes="member: 16006"><p>I figured out that the "IPS" is the Intake Pressure Sensor" integral to the IAT2 sensor.</p><p></p><p>Regarding the T and the oil separator, here is my theory: When the engine is at idle or part throttle, there is about 22" of vacuum in front of and behind the blower (upper and lower intake), so air is flowing from the air intake pipe, into the passenger side valve cover, down through the crankcase (where it picks up oil vapor), up through the PCV valve in the driver's side valve cover, and through both sides of the T into the upper and lower intakes.</p><p></p><p>The way an oil separator works is that the oil separator is a wide spot in the PCV hose. When the air goes from the narrow hose to the relatively wide oil separator, the air pressure drops (from the Ideal Gas Law). When the pressure drops, vapors start to condense into drops and the oil drops fall into the separator. This is that same reason we see rain in low pressure atmospheric conditions.</p><p></p><p>The intake manifold represents a really wide spot in the PCV system, so when the oily vapor hits the manifold (upper and lower), the relative pressure drops and the oil vapor condenses out and falls to the bottom of the intake manifold like rain. Gravity will take that liquid oil back down into the elbow in the bottom of the lower intake.</p><p></p><p>The thing I don't understand is where the liquid oil goes from there. There is no where for it to drain to...</p></blockquote><p></p>
[QUOTE="mwolson, post: 10210519, member: 16006"] I figured out that the "IPS" is the Intake Pressure Sensor" integral to the IAT2 sensor. Regarding the T and the oil separator, here is my theory: When the engine is at idle or part throttle, there is about 22" of vacuum in front of and behind the blower (upper and lower intake), so air is flowing from the air intake pipe, into the passenger side valve cover, down through the crankcase (where it picks up oil vapor), up through the PCV valve in the driver's side valve cover, and through both sides of the T into the upper and lower intakes. The way an oil separator works is that the oil separator is a wide spot in the PCV hose. When the air goes from the narrow hose to the relatively wide oil separator, the air pressure drops (from the Ideal Gas Law). When the pressure drops, vapors start to condense into drops and the oil drops fall into the separator. This is that same reason we see rain in low pressure atmospheric conditions. The intake manifold represents a really wide spot in the PCV system, so when the oily vapor hits the manifold (upper and lower), the relative pressure drops and the oil vapor condenses out and falls to the bottom of the intake manifold like rain. Gravity will take that liquid oil back down into the elbow in the bottom of the lower intake. The thing I don't understand is where the liquid oil goes from there. There is no where for it to drain to... [/QUOTE]
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03/04 Cobra Vacuum Lines Documented
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