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Old 05-10-2017, 04:13 AM   #1
atomicfire
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Default B25 head oil ports

Working on putting my car back together, and wanted to put in an oil pressure and temp gauge setup.

On the B25 heads, the oil source on the passenger side uses a banjo with two outlets to feed AVCS and turbo, so that side is sorted pretty well.

On the driver's side, there's two 1/8 JIS/BSPT 5mm plugs. I'm 100% sure at least one of them is an oil feed, as it goes all the way through the head to the front behind the timing cover for AVCS feed. The other one...I'm not so sure.

This thread has some information on the oil galley, but that was just someone wanting to disassemble and clean it:
https://forums.nasioc.com/forums/sho....php?t=2442948

I know the 2.5 SH Foresters use one of these for oil temp, but has anyone here used them for temp and pressure? I'm curious to see if this is a viable method. The oil pressure sender I have is way too big to go under the alternator or near the PCV port. If this doesn't pan out, I'll just sell the gauge I have no (Innovate) and go with their newer gauge that has smaller sensors.
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Old 05-10-2017, 06:30 AM   #2
bigBADbenny
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For the gallery plug on top of the block adjacent the turbo/avcs feed:
https://www.google.com.au/search?q=p...&client=safari
The other sensor can be teed from the stock oil pressure sender under the alternator...
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Old 05-10-2017, 08:39 AM   #3
Samurai Jack
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I don't know why you want to put in both oil pressure and oil temp.
Oil pressure is far more important than oil temp and you can determine oil temp by your oil pressure.

A remote oil pressure sender kit, as mentioned above, makes your life easy. You just have to find a place to mount the sender. I mounted mine over by the passenger side strut tower.

There is a galley plug on top of the block that is typically used to install the remote kit
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Old 05-11-2017, 04:02 PM   #4
ROTORCRAFT230
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You can do what I did. I got a oil drain plug from Oreillys Auto parts that has the same threads as the plug that currently houses the low pressure switch, drill and tap it to 1/8 NPT, get a grease gun flex extension hose and install those parts. Now you have easy access to the port. Look at my set up that I posted on "Engine oil pressure switch"
The grease gun hose is rated for 5000 psi so no worries on that. Mine has been there for several years and it has worked perfectly.
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Old 05-11-2017, 05:48 PM   #5
bigBADbenny
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https://forums.nasioc.com/forums/sho....php?t=2838661

Niiice, love the Honeywell adjustable oem replacement too
Whats the Parker airbrake hose for?
Also, where'd you locate the oil temp transducer?

Last edited by bigBADbenny; 05-11-2017 at 06:18 PM.
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Old 05-11-2017, 06:49 PM   #6
ROTORCRAFT230
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Thanks, I have the temp probe on a sandwich plate from perrin.

http://perrinperformance.com/i-22245...e-adapter.html

The adapter has two 1/8 npt ports on it. I'm using one for the temperature and the other is an Amsoil 2 micron bypass filter. The parker hose you saw on the top is the return from the 2 micron filter which I have plumed back into the oil fill cap. The filter is mounted inside the front R/H wheel well.

Haven't done a UOA yet but plan to on the next oil change.
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Old 05-11-2017, 09:10 PM   #7
bigBADbenny
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Love it!
Much like HAMMERDOWN's (LGT) 15k oci approach, but single bypass, no oil cooler and return to filler?
Do like Aubers offerings, quad sparkplug cht with dual dual gauges would be the thing :P

Last edited by bigBADbenny; 05-12-2017 at 01:02 AM.
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Old 05-17-2017, 01:49 PM   #8
atomicfire
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Worked great to cram in an oil temp sensor, which was already threaded JIS/BSPT.

However my oil pressure sender is in NPT and is too big for me to comfortably mount on the head.
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