I am working on adding an oil cooler to my turbocharged M42, and the only off-the-shelf option I've ever seen (Mocal takeoff plate) is no longer on the market. Before anyone asks if this is actually necessary, I see 280+F oil pan temperatures on track before I back off and run a couple laps in 5th. 2 laps on, 2 laps off is no fun.
So the goal is to take a stock early oil filter housing and chop it up to divert flow. I don't see an easy way to divert flow and use the stock filter without adding a bunch of restriction, so I plan to plumb an external oil filter and thermostat to reduce any additional load on the oil pump.
Problem is, I can't find any good documentation on how flow through the housing works, and there are more cavities and passages than I was expecting to find. Can anyone tell me if I'm right?
Starting from the top and working downwards.
So, do I have the flow path right? I guess I could have it backwards, but am basing this on the oil pump being at the bottom of the engine closer to those square ports, and most pressurized oiling and the oil rifles being up higher.
And what is that little rectangular port for? I can't find any reasonable explanation for it, nor have I seen any good block pics with it disassembled. I should have taken better pics when I replaced the gasket 6ish years ago...
So the goal is to take a stock early oil filter housing and chop it up to divert flow. I don't see an easy way to divert flow and use the stock filter without adding a bunch of restriction, so I plan to plumb an external oil filter and thermostat to reduce any additional load on the oil pump.
Problem is, I can't find any good documentation on how flow through the housing works, and there are more cavities and passages than I was expecting to find. Can anyone tell me if I'm right?
Starting from the top and working downwards.
- The round port at the top with the oring seal and drainback valve. Oil flow out of the filter housing, post-filter, into the main block oil rifle.
- The bung to the left of the round oring-ed port is the oil pressure switch, also after the filter
- Small rectangular port. This is on the unfiltered side...I have no idea where this goes into the engine, especially since it isn't filtered.
- Large casing void. This should not have any oil in it, and is sealed by the little oring on the end of the filter housing cap bolt.
- Upper square port, at the bottom left of the filter housing. Oil feed from the pump.
- Lower square port. dry and not used? Seems like wouldn't be a part of the casting if it didn't have a purpose.
So, do I have the flow path right? I guess I could have it backwards, but am basing this on the oil pump being at the bottom of the engine closer to those square ports, and most pressurized oiling and the oil rifles being up higher.
And what is that little rectangular port for? I can't find any reasonable explanation for it, nor have I seen any good block pics with it disassembled. I should have taken better pics when I replaced the gasket 6ish years ago...
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