uh-oh! Is oil in here a bad thing? - MR2 Owners Club Message Board
 
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post #1 of 5 (permalink) Old January 11th, 2017, 12:23 Thread Starter
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uh-oh! Is oil in here a bad thing?

I took off the throttle body last night (as I am resurfacing all the mating surfaces and ordering new gaskets, the previous owner used liquid gasket maker and there was an air leak at one of the mating surfaces).

As I disassembled, I found some residual oil inside this coupler-hose which attaches the throttle body to the supercharger.....

Is this a sign that my supercharger has a problem? Or is this normal?


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post #2 of 5 (permalink) Old January 11th, 2017, 14:57 Thread Starter
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Did some more hunting online, another use had a similar symptom and was suggested this:

"Oil deposits (excessive oil deposits) in the intake tract are generally due to excessive blow-by of combustion gasses past the pistons into the crankcase. If the volume of flow of combustion gasses is excessive, the flow will carry oil mist into the vent passages/hoses because this is the only normal means of escape for the gasses. Even higher flows of blow by will often pressurise the crankcase such that external joints will begin to leak or components be pushed out of place."
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post #3 of 5 (permalink) Old January 11th, 2017, 15:12 Thread Starter
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I found this from another old post, which seems reliant?:

Quote:
Originally Posted by Ben Wilson View Post
You will get some oil from blow by and some more if the supercharger is leaking, unless there is a huge amount of oil, I wouldn't worry about it.

If you haven't cleaned the cooler before, there may well be a lot of oil in there. I'd pull the inlet pipes and cooler and give them a clean if I were you.
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post #4 of 5 (permalink) Old January 11th, 2017, 15:15
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Oil in the intake is pretty common on forced induction engines, you'll get positive pressure in the crankcase as well as in the valve cover. This can sometimes push oil past the piston rings, but most commonly just pushes oil vapor out the pcv valve on the valve cover straight into the intake.

If you can visibly see the oil level going down on the dipstick between oil changes then you have a problem, other than that the engine is fine.
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post #5 of 5 (permalink) Old January 11th, 2017, 15:59
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To keep the oil out of the intake, put an oil catch-can on the PCV line.
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