The 15 Y/O Turbo M42 Build Thread (Now Holley EFI Terminator X Controlled)

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  • Dj Buttchug
    R3V OG
    • Jun 2010
    • 7648
    #826
    All because of a $12 spark plug

    Brings back some memories of building this engine when I was in tech school.

    Some scoring on my cylinder walls is a bit unsettling. There are areas on cylinder 1 and 4. The majority of damage is in hole 3 where the plug dropped. All areas are .002 or slightly deeper :(

    I have a new set of pistons and rings. We will do the same treatment as the m50. Cerakoted block and components. New oil squirters, the works. Crank, rods, and all bearings are in great shape so that is good news.

    It will be better than it was. I'm pissed, but it's not the end of this car. The M42 will live on.

    Here are a few photos.









    ​

    Turbo M42 Build Thread :Here
    Ig:ryno_pzk
    I like the tuna here.
    Originally posted by lambo
    Buttchug. The official poster child of r3v.

      Comment

      • econti
        E30 Enthusiast
        • May 2014
        • 1119
        #827
        Was it running quite lean at any point?
        sigpic

        (clicky on piccy to get to thread)

          Comment

          • Dj Buttchug
            R3V OG
            • Jun 2010
            • 7648
            #828
            Originally posted by econti
            Was it running quite lean at any point?
            Not since I installed the new engine management. Lean conditions could have been present during my Mega squirt days. I had a lot of troubles getting the car to run correctly in the beginning. The skirts on each piston have a some slight wear on each side indicating some issues.

            Turbo M42 Build Thread :Here
            Ig:ryno_pzk
            I like the tuna here.
            Originally posted by lambo
            Buttchug. The official poster child of r3v.

              Comment

              • Dj Buttchug
                R3V OG
                • Jun 2010
                • 7648
                #829
                What a sight to behold.

                A brand new M42 Cylinder head.

                17 units left in the world per BMW apparently.

                $2,900 OTD





                Turbo M42 Build Thread :Here
                Ig:ryno_pzk
                I like the tuna here.
                Originally posted by lambo
                Buttchug. The official poster child of r3v.
                  🥰 4
                  👍 1
                  ☕ 1

                  Comment

                  • Il Duce
                    R3V Elite
                    • Feb 2004
                    • 5018
                    #830
                    Jesus, it's beautiful.

                      Comment

                      • Dj Buttchug
                        R3V OG
                        • Jun 2010
                        • 7648
                        #831
                        Re-honed and decked. New pistons and rings.

                        Short block is back together now. Rods and pistons balanced within .47g

                        Top ring gap .0195
                        Bottom ring gap .0235
                        Cerakote block (burnt bronze)
                        New freeze plugs


                        Spins like buttah.






                        Last edited by Dj Buttchug; 01-10-2026, 07:06 PM.

                        Turbo M42 Build Thread :Here
                        Ig:ryno_pzk
                        I like the tuna here.
                        Originally posted by lambo
                        Buttchug. The official poster child of r3v.
                          🥰 3
                          👍 1

                          Comment

                          • econti
                            E30 Enthusiast
                            • May 2014
                            • 1119
                            #832
                            What's compression on it now?

                            Last edited by Dj Buttchug; 01-11-2026, 07:46 AM.
                            sigpic

                            (clicky on piccy to get to thread)

                              Comment

                              • Dj Buttchug
                                R3V OG
                                • Jun 2010
                                • 7648
                                #833
                                Originally posted by econti
                                What's compression on it now?
                                Same 8.5 to 1. As its always been.

                                Turbo M42 Build Thread :Here
                                Ig:ryno_pzk
                                I like the tuna here.
                                Originally posted by lambo
                                Buttchug. The official poster child of r3v.

                                  Comment

                                  • mike.bmw
                                    E30 Mastermind
                                    • Dec 2015
                                    • 1760
                                    #834
                                    Beautiful. Absolutely beautiful. This made my day, thanks!

                                      Comment

                                      • Dj Buttchug
                                        R3V OG
                                        • Jun 2010
                                        • 7648
                                        #835
                                        Did the old school by hand valve lapping. Took about 1.5 hours per cylinder.


                                        All parts cleaned up and installed. One more step to a reconditioned long block.

                                        ​

                                        Turbo M42 Build Thread :Here
                                        Ig:ryno_pzk
                                        I like the tuna here.
                                        Originally posted by lambo
                                        Buttchug. The official poster child of r3v.
                                          👍 2

                                          Comment

                                          • Dj Buttchug
                                            R3V OG
                                            • Jun 2010
                                            • 7648
                                            #836
                                            Getting closer now.



                                            Turbo M42 Build Thread :Here
                                            Ig:ryno_pzk
                                            I like the tuna here.
                                            Originally posted by lambo
                                            Buttchug. The official poster child of r3v.

                                              Comment

                                              • econti
                                                E30 Enthusiast
                                                • May 2014
                                                • 1119
                                                #837
                                                Looks a million bucks
                                                sigpic

                                                (clicky on piccy to get to thread)

                                                  Comment

                                                  • 2mAn
                                                    Señior Mod
                                                    • Aug 2010
                                                    • 20340
                                                    #838
                                                    Originally posted by econti
                                                    Looks a million bucks
                                                    Yea... freaking brand new!
                                                    Simon
                                                    Current Cars:
                                                    -1966 Lotus Elan
                                                    -1986 German Car
                                                    -2006 Volkswagen Jetta TDI

                                                    Make R3V Great Again -2020

                                                      Comment

                                                      • varg
                                                        Florida Turbo Man
                                                        • May 2014
                                                        • 3338
                                                        #839
                                                        M42s never looked so good.

                                                        IG @turbovarg
                                                        '91 318is, M20 turbo
                                                        '94 525iT slicktop, M50B30 + S362SX-E, 600WHP DD or bust
                                                        '93 RX-7 FD3S, pretty and slow

                                                          Comment

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