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Old 10-07-2020, 03:59 PM   #1
WolfPk
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Member#: 498388
Join Date: Feb 2019
Vehicle:
2007 STI
Obsidian Black Pearl

Default Boost leak in oil pan?

"Kevin was correct about a boost leak in the pan. This is what John at TGA said

So we are looking for vacuum leaks mainly which can turn into boost leaks, the crankcase should actually pull a vacuum in boost. In this scenario it would not. It would cause positive crankcase pressure and thats where pcv comes in. Also why aosís are used so much on subaru, because on average there is positive pressure in case at idle. Smoke will get there from valves being open and seeping passed unsealed ringlands."

I found all this when someone I know took they're car to a shop near where I'm from, and just want to know for myself if this is an actual possibility.

Sti block with sti turbo running about 18psi peak
Oil pan possibly dented
I'm just not seeing a possibility of a boost leak in the oil pan especially since the connection the crankcase is before turbo on the inlet. Don't think there was even an oil leak, will update on that.

Edit: I know alot of what is said by this person is true. But I'm not seeing a correlation to a boost leak in the oil pan, this is what was originally told to the car owner and there's a 700+$ fee for oil pan R&R.
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Last edited by WolfPk; 10-07-2020 at 04:10 PM.
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Old 10-07-2020, 04:19 PM   #2
BlackFighter
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Location: Philly
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2004 WRX STI Black
RalliSpec Shortblock

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If Im not mistaking the only vacuum suction in not in the pan but only in the oil pick up. Oil drips out if there is a leak in the oil pan. If it would be under vacuum then there would be no leaks.
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Old 10-07-2020, 04:34 PM   #3
WolfPk
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Obsidian Black Pearl

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Quote:
Originally Posted by BlackFighter View Post
If Im not mistaking the only vacuum suction in not in the pan but only in the oil pick up. Oil drips out if there is a leak in the oil pan. If it would be under vacuum then there would be no leaks.
That's what I was thinking, so even if oil was to escape or of there was some type of break in the seal there's no way you're getting a boost leak in the oil pan.
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Old 10-07-2020, 04:38 PM   #4
BlackFighter
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RalliSpec Shortblock

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Yap. If anything there is positive pressure in the oil pan. Or it has to bee soo bad that the car wont run right. Easy way to check id have your car running, take out the oil dip stick and feel if there is air being blown out or being sucked in. If im not completely retarded it should be blowing out. That mean the oil pan is under the same pressure. And that would mean every time someones dip stick come loss under driving then they would have a boost leak. Tell your friend to run form hat shop. sounds like he was pushing in to buying parts he didn't need to.

Last edited by BlackFighter; 10-07-2020 at 04:59 PM.
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