6 bolt swap 90 ofh turbo feed

[jimbob_843]

I have an idea for feeding my turbo from a 90 ofh with external cooler. Would it be good to use a T adapter on the oil cooler return right before it gets to the housing? This would provide cool oil to my turbo and with use of a restrictor, keep from over oiling the turbo and keep a steady flow of cool oil to the motor. I cant find anything about someone doing this before so maybe nobody has and maybe there is a reason? Btw turbo is just a s16g. And plan to run ss lines with oil cooler.

 

[1990AWD]

Port #1 is where I'm feeding my turbo from, and I understood that it actually has just come through the filter and cooler so its cool, clean oil, which is what you were wanting.

 

[19Eclipse90]

Port #1 is where I'm feeding my turbo from, and I understood that it actually has just come through the filter and cooler so its cool, clean oil, which is what you were wanting.

Based on my own observations of the '90 OFH, this isn't correct. #1 is unfiltered and straight from the oil pump.

Oil flows from the pump through the "tube" on the right side of #1 where it also must pass by the oil pressure relief valve (#5). From there, it flows into the filter area and works it's way inward to the filter core. Flowing through the center of the filter, it flows towards #8 where it either skips the oil cooler or flows through it (via the oil cooler bypass valve, #4). The cooler return (#6) flows to the rest of the engine.

I am using #3 on my 6-bolt swapped '96 for turbo feed. The only issue I see with using a "T" at the oil cooler return line is that the oil cooler can (and, if I understand it correctly, will) be bypassed. This means you may not always have oil flowing to your turbo.

 

[Boomdeeze]

Port #3 is what I am also using on my 6 bolt swap with a 90 OFH.

 

[jimbob_843]

Ahhh, i see. Maybe oil not cooled is better than nothing. The turbo is gonna be water cooled anyway so i may just run it from #1 .

 

[lil corb]

Based on my own observations of the '90 OFH, this isn't correct. #1 is unfiltered and straight from the oil pump.

Oil flows from the pump through the "tube" on the right side of #1 where it also must pass by the oil pressure relief valve (#5). From there, it flows into the filter area and works it's way inward to the filter core. Flowing through the center of the filter, it flows towards #8 where it either skips the oil cooler or flows through it (via the oil cooler bypass valve, #4). The cooler return (#6) flows to the rest of the engine.

I am using #3 on my 6-bolt swapped '96 for turbo feed. The only issue I see with using a "T" at the oil cooler return line is that the oil cooler can (and, if I understand it correctly, will) be bypassed. This means you may not always have oil flowing to your turbo.

Excellent info!

 

[1990AWD]

See Justin said he has always used the upper port so that's what I did. You could be very correct about port #3 being the better option, but #1 hasn't given me any issues yet.

Click me and scroll down to post #249-250.

 

[19Eclipse90]

Justin and I definitely disagree, then.

The lubrication diagram found in this thread shows the oil pressure relief valve before the filter: OFHs Oil Flow Pathways For The Engine (Questions).

I'll post some pictures of the '90 OFH (including the back side) in a bit.

Here we go. The depth of the port on the left (that connects to the oil pressure relief valve) is much deeper than the one on the right -- meaning it is the "outer" port leading to #1 and #2 (as referenced in this thread, not the linked one). The flow of oil, from the thread I linked to above, must come through there first. The hole drilled for #3 (again, in this thread) is the same hole as the right exit on the backside picture below.

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[1990AWD]

Justin and I definitely disagree, then.

I could very well be wrong and you right, I'm just going off what I've heard.

 

[JusMX141]

I did state in that thread that I have absolutely zero experience with '90 filter housings.


You should study the oil's path and choose the source with the clean, cool oil.