N52 oil pan design for Z4 engine arm based swap

[DesertBMW]

any plan on making more and selling them?

[hoveringuy]

any plan on making more and selling them?

No, but the CAD will be available plus Harper Fab will be making them (or similar...) https://harperfab.com/products/e30-24v-oil-sump-v3

[hoveringuy]

Final answer for the aluminum oil pan. Some changes on this one, which was now completely cut and bent to reduce welding and increase accuracy. All of the pieces fit GREAT and I there wasn't even 1/32" gap anywhere.

The pickup is completely 3D printed in aluminum as well as the strainer, which uses a cylindrical screen to give it a small diameter while keeping screen area. This keeps the hole in the top plate small.

[hoveringuy]

The finish is Type 1 Alodine.

Fits great, lots of room at the steering rack means I can eventually move the engine back an inch.

I have the CAD for all of this, happy to share!

[TurboDirty]

This is great work! Do you know when Harpor Fab plans to start manufacturing these?

[CarlKB]

Hey guys (incl hoveringuy) - I'm just about to get my oil pan welded up (thanks for the file Hoveringuy). When getting the engine ready I see a few things I hadn't thought about earlier. Is there any need for the crankcase return pipe? From what I see on other builds this has been deleted. Also, do I need the electronic level sensor (I'm planning on putting in dipstick). Thanks from a newbie!

[Striker01]

Hey guys (incl hoveringuy) - I'm just about to get my oil pan welded up (thanks for the file Hoveringuy). When getting the engine ready I see a few things I hadn't thought about earlier. Is there any need for the crankcase return pipe? From what I see on other builds this has been deleted. Also, do I need the electronic level sensor (I'm planning on putting in dipstick). Thanks from a newbie!

No need for the electronic sensor if you have a dipstick. I wired my original M20 one in so my check panel would work, but it's not required and will require modifying the pan and baffle to install, as well as adding wiring to the engine harness.

I would check to see if you can upgrade to the later N52 valve cover and PCV system, they don't have the return to the oil pan.

[Striker01]

Another member had my brother and I assemble hoveringuy 's newest version of his oil pan. Thanks to him for providing the CAD files and some insight on assembly.

Here it is fresh from SCS. The bends require a square edge so he designed them into the files, just have to cut along the slits. Keep the remains from the third pic as only one corner on this one needs to be cut yourself.

[Striker01]

Here it is taped together for a test fit.

[Striker01]

This is the only corner you have to fab yourself, from the cut off extra.




We started by welding on the back main piece to make sure the rear piece doesn't protrude inside the flange.



We made a mistake here. One of the rear main tacks popped during welding and I had to hold it down while my brother re tacked it. In hindsight we should've tacked the main pan piece before fully welding this. You can see in the pic below that I pushed it down just a little too far but didn't realize it until it was fully welded, not a bit deal but required trimming the main pan a little. That gap looked a little big to try and fill. (I know, that's what she said)

[Striker01]

This thing pretty much fit together perfect, very little adjustment required.




Some hammering on this front corner to ensure bolt clearance.







At this point I recommend fully welding as much of the inside flange that you can get to, before you cut the ribs out of it.

[Striker01]

Next it was time to assemble and check fitment of the 3d printed (super cool) oil pickup, 1 or 2 of the support ribs will need to be cut out for this step. It comes in 3 pieces and requires some stainless steel mesh, that hoveringuy supplied and even included the dimensions for.




I bent the ends through the other piece to hold it together for welding, probably not required but I figured it couldn't hurt.


Flip the piece on the left over and weld it together, after ensuring the mesh is seated in it's seat. I struggle with this a couple times before I decided to interlace them.



Finished and ready to be connected to the other piece. IIRC a short piece of 1" OD tubing is required to join them together. These pieces did require a little sanding to get the tubing to slide in.



I used a 4mm allen so set the height, figure with the gasket is should be right at the 4-6mm clearance required from the bottom of the pan.

Set it, mark it, remove and weld.

[Striker01]

Finished product.



This is a piece of 15mm ID x 20mm OD tubing that was pressed into a 20mm ID x 25mm OD tube for the dipstick seat. Once is was pressed in, I drilled it on a drill press with this tool

https://www.amazon.com/dp/B00FXJB912...fed_asin_title

to ensure it was round for the dipstick.





Weld it to the main pan top piece, make sure it doesn't protrude more than about an 1/8" below or you will have issues sliding in the baffle. Then weld on the top.

You can also see the one corner that has to be fabricated, we used 2 pieces to make it easier.



Once that was done my brother fully welded as much of the inside of the pan that he could get to, main flange is the most important as you will have to clearance some of the flange welds for the pan bolts to fully seat.

Don't forget the M18 x 1.5 bung for the drain plug.

[Striker01]

The main baffle piece will require some adjustment to fit, this was by design because every pan will come out just a little different and Steve wanted it fit nicely. The key is to sneak up on it.



Once that piece fit correctly, I bolted on the top, marked the dipstick location and drilled a hole for it.



The dipstick confused me until Steve told me to cut the top on the tube off . I don't have any pictures but you can't get the dipstick far enough into the pan and still get the baffle in, the seat would need to be below the top piece. The solution is to set the seat where it needs to be for the baffle to fit and then cut off the top of the dipstick tube until the dipstick full mark is even with the top of the baffle. Then use a flaring tool to expand the top so the dipstick handle o-rings will slide in.

Few more pics after pressure testing and cleanup. You can see why the flange needs to be fully welded on the inside, bolt clearance required cutting back some of the outside welds significantly.

[Striker01]

I like this pan a lot!! I decided to go ahead and make one for myself as well. I did have a lesson learned though.

For the pan we made for someone else I was very meticulous about using scotch brite pads on all the seams and then wiping with acetone before welding. His pan passed the pressure test first try. On mine I was less picky and ended up chasing down multiple pin holes after it wouldn't hold pressure. Lesson learned, take the few extra minutes and prep the aluminum properly.

I'm kinda hard headed and want to keep the m20 oil level sensor so I had to improvise with this pan. I drew a flange and had SCS bend it and add m6 studs.



Pan and baffle required trimming, also flange had to be cut after setting the depth of the sensor.



I think it looks pretty cool on there!