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Old 06-27-2008, 12:22 PM   #1
manxaru
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Default 2.5 Sti block question...

There are two threaded bosses on the top of my STi block, one on the bellhousing end and one on the crank end. (see pics below) I'm 99% sure that the tap on the bellhousing end is for oil, correct? What is the tap on the crankshaft side of the block, oil or coolant?

Thanks!

(2.0 block shown for illustration purposes)

http://www.flickr.com/photos/65926977@N00/2615512539

http://www.flickr.com/photos/6592697...in/photostream
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Old 06-27-2008, 12:33 PM   #2
Scooby921
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I do believe both are oil and both are normally plugged from the factory. The rear one is where people typically add an oil pressure sensor by way of a replacement plug and remote mount kit.
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Old 06-27-2008, 03:53 PM   #3
manxaru
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Originally Posted by Scooby921 View Post
I do believe both are oil and both are normally plugged from the factory. The rear one is where people typically add an oil pressure sensor by way of a replacement plug and remote mount kit.
Thanks for the reply.

Any second opinions on the boss closer to the crank end? When I look into the hole with the plug removed it looks kind of wide open and deep to be an oil galley, but I need to be sure...
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Old 06-27-2008, 04:32 PM   #4
badblackwrx
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The one towards the back of the engine is where the oil line attaches to your turbo. The one in the front is where the oil pressure sensor is located.
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Old 06-27-2008, 05:37 PM   #5
charliew
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Quote:
Originally Posted by badblackwrx View Post
The one towards the back of the engine is where the oil line attaches to your turbo. The one in the front is where the oil pressure sensor is located.
1/2 right 1/2 wrong

The one in the front is where the stock oil sender goes, it's over the gallery that goes to the oil pump, filter and mains.

The one in the rear is over the rear main. They are connected together. The one in the rear could be used for a non-stock oil sender.

The turbo oil feed for both the wrx and sti is on the rear of the passenger head. The port in the head for the turbo has a restricter in it to reduce the volume of oil supplied to the turbo.
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Old 06-27-2008, 06:53 PM   #6
novacivic
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Quote:
Originally Posted by charliew View Post
1/2 right 1/2 wrong

The one in the front is where the stock oil sender goes, it's over the gallery that goes to the oil pump, filter and mains.

The one in the rear is over the rear main. They are connected together. The one in the rear could be used for a non-stock oil sender.

The turbo oil feed for both the wrx and sti is on the rear of the passenger head. The port in the head for the turbo has a restricter in it to reduce the volume of oil supplied to the turbo.

100% correct
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Old 06-27-2008, 09:41 PM   #7
manxaru
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Thanks guys.

Is it safe to say that since the two ports are connected together that you would see the same oil pressure at either location?

Last edited by manxaru; 06-28-2008 at 09:18 AM.
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