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1989 325i- S50 Swap Project

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    #16
    Progress has been rather slow lately compared to my other builds but I'm still pushing on! My machine shop guy has been out of town but returns sometime next week, I plan to drop off the S50 cylinder head for new valve stem seals, pressure testing and a light resurface. Other then that my Dad and me will be installing the new rod bearings at his house (I bought all the new rod bearing bolts/ fasteners already from the BMW dealership aka my work).


    Today I decided to tackle installing the last of the 325iS bits.. the leather rear seats and rear premium sound speakers. Thankfully BMW was smart and has a "dotted line" drawn out on the backside of the rear shelf to make this a easy DIY for anyone thinking of upgrading to premium sound speakers. Simply cut along the "dotted line" and screw the new speakers in place. Even better, it has holes already drilled for screwing the new premium sound speakers into the rear shelf. It's almost like they expected people to do this upgrade at some point.

    I also got my new wheels in the mail.. plus I have Ground Control Coilovers in the backyard I've been saving for a build.. Stay Tuned.


    Pics speak for themselves.
















    Last edited by KIRIEIW; 02-25-2020, 09:05 PM.


    1992 M tech 2 Convertible - S50 Swap
    1992 e34 Touring- S50 Swap
    1992 325i-S50 Swap

    1995 e36 M3 Mugello Red - S50
    1991 325i Convertible Laguna Green (SOLD)
    1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
    1988 325i Convertible Alpine White (SOLD)
    1991
    Brilliantrot Convertible 80k Miles (SOLD)
    1992 325i Convertible Schwarz (SOLD)
    1992 318i Convertible Project-Finished (SOLD)

    Comment


      #17
      Oh ya I found a pair of front OE BMW mat's in the trash at work the other day, well actually the detailer at work did and he thought of me. He was even nice enough to scrub them clean for me! Not a perfect fit but hey, they were free. They came originally from a Z3 M convertible.


      Not a huge fan of the ///M but these are OEM mat's, I guess I'll keep these for a few months till I cough up the money and buy a set of 1 series mats after the winter months are over.



      (Don't judge the filthy carpets, I'll have the detailer scrub them once she's running )




      Last edited by KIRIEIW; 02-21-2020, 09:20 PM.


      1992 M tech 2 Convertible - S50 Swap
      1992 e34 Touring- S50 Swap
      1992 325i-S50 Swap

      1995 e36 M3 Mugello Red - S50
      1991 325i Convertible Laguna Green (SOLD)
      1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
      1988 325i Convertible Alpine White (SOLD)
      1991
      Brilliantrot Convertible 80k Miles (SOLD)
      1992 325i Convertible Schwarz (SOLD)
      1992 318i Convertible Project-Finished (SOLD)

      Comment


        #18
        Well good news, machine shop dude is back in town. He texted me today while I was at work saying he just landed into SFO and was going into the shop to work a few hours.. Crazy dude! I told him I'll drop it off tomorrow because I still had the cam's installed.. so after I got off work/ finished dinner I went to town and removed the cams. I'm still looking for a front timing cover so if anyone has one laying around send a PM..

        Nothing major but he's going to
        -Hot tank the head clean
        -Check for cracks/ pressure test the head
        -Replace all the valve stem seals
        -Give the head a light resurface








        Last edited by KIRIEIW; 02-21-2020, 09:23 PM.


        1992 M tech 2 Convertible - S50 Swap
        1992 e34 Touring- S50 Swap
        1992 325i-S50 Swap

        1995 e36 M3 Mugello Red - S50
        1991 325i Convertible Laguna Green (SOLD)
        1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
        1988 325i Convertible Alpine White (SOLD)
        1991
        Brilliantrot Convertible 80k Miles (SOLD)
        1992 325i Convertible Schwarz (SOLD)
        1992 318i Convertible Project-Finished (SOLD)

        Comment


          #19
          What's the plan for the bottom end?



          Comment


            #20
            Originally posted by ZekeTheSneak View Post
            What's the plan for the bottom end?
            I bought brand new main and rod bearings along with new hardware at work (since the rods/ mains are stretch bolts and can't be reused). I actually just got started on the bottom end, we removed the pistons today after work and I plan on dropping the block off tomorrow to my machine shop.



            1992 M tech 2 Convertible - S50 Swap
            1992 e34 Touring- S50 Swap
            1992 325i-S50 Swap

            1995 e36 M3 Mugello Red - S50
            1991 325i Convertible Laguna Green (SOLD)
            1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
            1988 325i Convertible Alpine White (SOLD)
            1991
            Brilliantrot Convertible 80k Miles (SOLD)
            1992 325i Convertible Schwarz (SOLD)
            1992 318i Convertible Project-Finished (SOLD)

            Comment


              #21
              Got my cylinder head back today from the machine shop . He sent me the pic bellow and figured I'd post it here. Also I got off work a bit early today so my Dad and I removed the pistons from the block and properly labeled them in order. I plan to drop the block off at the machine shop tomorrow, when I picked up the head today we talked a bit about the engine build and figured I might as well hot tank the block, so it looks like I'll be dropping the block off tomorrow afternoon. He plan's to hot tank the engine block clean plus giving the cylinder walls a light hone.


              Once I get the block back we'll re install the new bearings, cylinder head, and re seal the rest of the engine. Soon after that she'll be living a comfortable life in a 89' 325i coupe.









              Last edited by KIRIEIW; 02-21-2020, 09:22 PM.


              1992 M tech 2 Convertible - S50 Swap
              1992 e34 Touring- S50 Swap
              1992 325i-S50 Swap

              1995 e36 M3 Mugello Red - S50
              1991 325i Convertible Laguna Green (SOLD)
              1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
              1988 325i Convertible Alpine White (SOLD)
              1991
              Brilliantrot Convertible 80k Miles (SOLD)
              1992 325i Convertible Schwarz (SOLD)
              1992 318i Convertible Project-Finished (SOLD)

              Comment


                #22
                Engine block off to the machine shop!








                Last edited by KIRIEIW; 02-22-2020, 01:07 PM.


                1992 M tech 2 Convertible - S50 Swap
                1992 e34 Touring- S50 Swap
                1992 325i-S50 Swap

                1995 e36 M3 Mugello Red - S50
                1991 325i Convertible Laguna Green (SOLD)
                1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
                1988 325i Convertible Alpine White (SOLD)
                1991
                Brilliantrot Convertible 80k Miles (SOLD)
                1992 325i Convertible Schwarz (SOLD)
                1992 318i Convertible Project-Finished (SOLD)

                Comment


                  #23
                  Got the block back from the machine shop, everything's really clean now . The cylinder walls were re honed, he inspected the crankshaft, and hot tanked the pistons clean as can be, and I had him stamp the connecting rods/ main caps. He also hot tanked the engine block. BMW doesn't mark the connecting rods or main's so make sure you mark them before removal! I marked them with a sharpie but once I got everything into his shop he stamped/ numbered them permanently.


                  I have to order new rings now (I wasn't sure if I was going to replace them at first but being this deep into the build, why the hell not). Once I have them ordered my machinist was nice enough to offer a hand measuring the ring gap at my house in the garage. This has basically turned into a full engine rebuild at this point, all over a stupid facebook marketplace deal gone wrong. I guess the good news is once it's done this should be a fun little car.


                  Onto the pics;















                  You can see this connecting rod cap is now stamped "5" indicating piston #5














                  Last edited by KIRIEIW; 02-26-2020, 12:22 PM.


                  1992 M tech 2 Convertible - S50 Swap
                  1992 e34 Touring- S50 Swap
                  1992 325i-S50 Swap

                  1995 e36 M3 Mugello Red - S50
                  1991 325i Convertible Laguna Green (SOLD)
                  1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
                  1988 325i Convertible Alpine White (SOLD)
                  1991
                  Brilliantrot Convertible 80k Miles (SOLD)
                  1992 325i Convertible Schwarz (SOLD)
                  1992 318i Convertible Project-Finished (SOLD)

                  Comment


                    #24
                    I'm loving the frequent updates! Thanks for sharing!

                    Comment


                      #25
                      WOW you guys won't understand the struggle I had getting a hold of piston rings for this S50.. OEM rings cost $240 per piston (total would be $1440 plus tax... would you also like that installed?). BMW used Mahle rings in S50's from the factory, so Mahle rings and OEM rings are the same. I know this because the pistons I removed from the engine are stamped "MAHLE". The trouble comes with finding a seller who still has these ultra rare 86mm Mahle rings in the year 2020..

                      After roughly 3 hours of fooling around online, I finally found a seller in the UK who was happy to ship them to me. Total was still over $411 bucks shipped..


                      Obviously the price is totally marked up but I don't blame him, he's the only seller who still has these rings and I'm sure he's down to only a few last sets. Literally everywhere is out of stock when you look online, and you send them an email and the response is something along the lines of "sorry, we can't get them anymore". Total shame MAHLE hasn't made another batch of rings for these engines.. All I have to say is S52 rings are a hell of a lot cheaper and have aftermarket support unlike S50!





                      BMW part number: 11-25-1-403-809

                      MAHLE part number: 081 12 N0







                      IMG_9315 by Kevin O'Brien, on Flickr


                      IMG_9316 by Kevin O'Brien, on Flickr
                      Last edited by KIRIEIW; 03-04-2020, 07:52 PM.


                      1992 M tech 2 Convertible - S50 Swap
                      1992 e34 Touring- S50 Swap
                      1992 325i-S50 Swap

                      1995 e36 M3 Mugello Red - S50
                      1991 325i Convertible Laguna Green (SOLD)
                      1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
                      1988 325i Convertible Alpine White (SOLD)
                      1991
                      Brilliantrot Convertible 80k Miles (SOLD)
                      1992 325i Convertible Schwarz (SOLD)
                      1992 318i Convertible Project-Finished (SOLD)

                      Comment


                        #26
                        those little things will get you. glad you got it sorted!

                        Comment


                          #27
                          Well it's been a while since I updated this but the build is going pretty well. So far I got the M20 pulled along with the trans/ driveshaft out, I also got the open differential removed so I can bolt in the new 3.25LSD.


                          The S50 is also going pretty smoothly, I had my machinist swing by the house and he gave me a hand gaping the piston rings to make sure they're in spec. I ended up ordering new oil "squirters" (go underneath the main bearings) so once those to come in from work I plan on install all those along with the new bearings/ continue with re sealing the engine. I also re painted the block while its out of the car.

                          Lastly I had my Dad mess with this e83 brake booster which I plan on installing. It's pretty similar to the e90 booster swap for 24v swap (as far as my understanding goes) except for the fact the brake lines enter on the left side of the brake master cylinder (like the stock e30 set up). Using a tap/ die kit the stock e30 clevis now fits onto the e83 booster.















                          Last edited by KIRIEIW; 03-18-2020, 09:06 PM.


                          1992 M tech 2 Convertible - S50 Swap
                          1992 e34 Touring- S50 Swap
                          1992 325i-S50 Swap

                          1995 e36 M3 Mugello Red - S50
                          1991 325i Convertible Laguna Green (SOLD)
                          1987 325i (SOLD);1992 M tech 2 Convertible (SOLD)
                          1988 325i Convertible Alpine White (SOLD)
                          1991
                          Brilliantrot Convertible 80k Miles (SOLD)
                          1992 325i Convertible Schwarz (SOLD)
                          1992 318i Convertible Project-Finished (SOLD)

                          Comment

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