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Spare M42 refresh/rebuild

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    #31
    Small update: S52b32 pistons came in the mail yesterday. I cleaned 4 of them, and I'm about to drop off the block/pistons at machine shop in a little while.

    S52b32 pistons



    Comparo: left M42, right S52



    Top M42, Bottom S52




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    '91 318i (Alpine) - daily
    '88 325ix (Zinno) - drive here and there!

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      #32
      Looking good. What are the specs going to be? Bore, Rod length, HG thickness, Piston Dish, Static Compression Ratio etc? I considered building a stroker M42 to replace my stock engine but when I looked into it the cost of a 2L stroker M42 build was more than a 2.8L stroker M20 so I'm going with the M20.

      IG @turbovarg
      '91 318is, M20 turbo
      [CoTM: 4-18]
      '94 525iT slicktop, M50B30 + S362SX-E, 600WHP DD or bust
      - updated 1-26

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        #33
        Originally posted by varg View Post
        Looking good. What are the specs going to be? Bore, Rod length, HG thickness, Piston Dish, Static Compression Ratio etc? I considered building a stroker M42 to replace my stock engine but when I looked into it the cost of a 2L stroker M42 build was more than a 2.8L stroker M20 so I'm going with the M20.
        Thanks..bore 86.4mm, rods 140mm (m42), compression goal is 11.5:1.. if you know how to source, it doesn't cost that much. I will be less then $2k when said and done with this build, and this is including $700 worth of new timing components;-)

        Sent from my SAMSUNG-SM-N910A using Tapatalk
        '91 318i (Alpine) - daily
        '88 325ix (Zinno) - drive here and there!

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          #34
          I'd be impressed if you can pull of a quality rebuild of a stroker M42 for sub 2k including timing gear. Will have to get the details from you at the meet.

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            #35
            Good looking build. What machine shop did you end up using? I'm out in Centreville and have a spare M50 laying around that I hope to start building into a high compression M50/S52 hybrid for my 318 in the next year or two.


            "Not putting miles on your M3 is like not having sex with your girlfriend so she'll be more desirable to her next boyfriend..." -Someone Awesome

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              #36
              Originally posted by CharlaybitM3 View Post
              Good looking build. What machine shop did you end up using? I'm out in Centreville and have a spare M50 laying around that I hope to start building into a high compression M50/S52 hybrid for my 318 in the next year or two.
              Performance Machine inc. in Springfield, VA

              Sent from my SAMSUNG-SM-N910A using Tapatalk
              '91 318i (Alpine) - daily
              '88 325ix (Zinno) - drive here and there!

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                #37
                Thanks!

                Question... why are you upping the compression if going turbo? Or are you going to run corn juice?


                "Not putting miles on your M3 is like not having sex with your girlfriend so she'll be more desirable to her next boyfriend..." -Someone Awesome

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                  #38
                  Originally posted by CharlaybitM3 View Post
                  Thanks!

                  Question... why are you upping the compression if going turbo? Or are you going to run corn juice?
                  If I raise compression, I won't turbo this engine. I'll turbo the engine that's in the car right now, later on. I'm leaning more towards keeping this one NA.

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                  Last edited by fresh_TD; 03-03-2016, 02:53 PM.
                  '91 318i (Alpine) - daily
                  '88 325ix (Zinno) - drive here and there!

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                    #39
                    Block is done, bored, honed. Head is almost done, except somehow FCP sent me the wrong valve stem seals, not a big deal though..





                    Pic of oil squirter that go underneath the main bearings..I lost one of them:-(



                    Sent from my SAMSUNG-SM-N910A using Tapatalk
                    '91 318i (Alpine) - daily
                    '88 325ix (Zinno) - drive here and there!

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                      #40
                      Sweet! I'm really excited to eventually see a worked N/A M42 in person.

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                        #41
                        M47 crank finally came in from the UK.. few pics to compare both M42 & M47 cranks.

                        M42 left, M47 right











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                        '91 318i (Alpine) - daily
                        '88 325ix (Zinno) - drive here and there!

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                          #42
                          What's the weight difference?

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                            #43
                            Originally posted by roguetoaster View Post
                            What's the weight difference?
                            Not sure, but I'll weigh them both in the next few days to find out

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                            '91 318i (Alpine) - daily
                            '88 325ix (Zinno) - drive here and there!

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                              #44
                              Sub'd. Nice progress
                              NASA
                              BMWCCA member
                              PCA member 25yrs




                              1991 318IS slick top
                              1997 M3 sedan
                              2001 325CI DD

                              “whoever turns the wheel the least, wins"

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                                #45
                                New oil squirters, and new oil pump came in today.




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                                '91 318i (Alpine) - daily
                                '88 325ix (Zinno) - drive here and there!

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