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Which engine would you choose for a swap?

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    Originally posted by flyboyx View Post
    this is one of those threads that when it was first posted i figured it would die after about 9 entries or so. how it has made it all the way to 162 is almost unfathomable.?
    Because this has been one of those threads where it was allowed to venture off topic, but it was beneficial. Almost kind of an information dump for all of us on the pros and cons of motor swaps. It's been civilized, and informative.

    If only the rest of the world could discuss topics in the same decorum...


    :)
    1984 Alpina B6 2.8/1 #35
    1991 325i MT2 Touring (JDM bro)
    1991 Racecar (Chase Schmidt's former drift car - M30)
    2006 BMW X3
    2011 Audi A3 - wife's other German car

    Comment


      Originally posted by digger View Post
      stock M30 is a bit weak especially for its size, hypothetically it has more torque potential because it's a bigger engine and there's room more much more cubes if desired. On some of the mild builds the torque starts at 200+ from 2000rpm and never lets off. Paul Burke used to be the man.
      Power potential is probably about the same on a built engine as it has a big bore and can fit a huge inlet valve and flow essentially what a smaller bore 4V does.... Pursuing that too much distracts from the torque delivery as the valvetrain has some limitations (unless you get some radical custom parts) that will affect drivebility and lessen some of its strengths.

      totally different style of power delivery though so certainly a matter of preferences.
      N52 makes peak torque at ~2000rpm as well (thanks to advancements like vanos, VVL, DISA, etc). It's like having the same flat torque curve only with a more compact engine that weighs like 150lbs less, and it revs to 7000rpm stock.

      I like M30s, they are old school cool, and tough as nails - but I wouldn't personally want one in an E30. Actually, it would be really cool to dump it into some old American rat rod..
      Build thread

      Bimmerlabs

      Comment


        Originally posted by nando View Post
        I like M30s, they are old school cool, and tough as nails
        You wanna know just how tough the M30 is: After another car (full tube frame stock car) ran headlong in to the front of mine, taking out the radiator and pushing the whole front end of my race car in, I fired it back up after the collision and didn't see any smoke and everything looked good, so I continued to race for 2 more laps at full throttle. But then the smoke came and I limped back to the pit and parked it. The radiator had been punctured and lost all coolant on the initial hit, and I was running 2 and half laps at full throttle with no coolant.

        I was still able to fire the car up and drive it in the trailer, and we actually moved it under it's own power 4 more times until I got it back to my place earlier this year to disassemble the car. Upon tearing the motor apart, every piston was missing pieces on the crown edges, the cylinder bores had bits of piston melted/fused in to it, but the head gasket had held, and all the bearing surfaces were fine. Head surface was checked and is flat and no cracks.

        They are a tank.
        1984 Alpina B6 2.8/1 #35
        1991 325i MT2 Touring (JDM bro)
        1991 Racecar (Chase Schmidt's former drift car - M30)
        2006 BMW X3
        2011 Audi A3 - wife's other German car

        Comment


          yeah, it reminds me of the dodge 225 slant 6. you couldn't kill that thing. I saw one in a junkyard with a 6" hole in the block. I bet it still ran too..
          Build thread

          Bimmerlabs

          Comment


            Originally posted by nando View Post
            yeah, it reminds me of the dodge 225 slant 6. you couldn't kill that thing. I saw one in a junkyard with a 6" hole in the block. I bet it still ran too..
            They call it the power tower. They're pretty legendary.

            Sent from my SM-G970U using Tapatalk
            91' 318is 90' 325is

            Originally posted by Sonny
            Buy the E30s, they ain't gonna last long
            E30 can make you, E30 can break you
            "He who controls the Nova's, controls the Boomers"

            Comment


              Honestly, straight 6ís in general across the board are beefy motors. BMW M20/M30/..etc, slant 6, the old blue flame six and stove bolt sixes of GM, the ford sixes, the mercs, the old Datsun sixes in the 240-280z, the 2JZ. Hell even AMC couldnít screw up an inline six.


              Sent from my iPhone using Tapatalk
              1984 Alpina B6 2.8/1 #35
              1991 325i MT2 Touring (JDM bro)
              1991 Racecar (Chase Schmidt's former drift car - M30)
              2006 BMW X3
              2011 Audi A3 - wife's other German car

              Comment


                Originally posted by nando View Post
                N52 makes peak torque at ~2000rpm as well (thanks to advancements like vanos, VVL, DISA, etc). It's like having the same flat torque curve only with a more compact engine that weighs like 150lbs less, and it revs to 7000rpm stock.

                I like M30s, they are old school cool, and tough as nails - but I wouldn't personally want one in an E30. Actually, it would be really cool to dump it into some old American rat rod..
                my logic is if you're going to swap an engine then you want it to be a significant step up (based on personal priorities) to what can be achieved by modifying what you already have installed using the costs to do an actual swap.

                based on this i wouldn't do a M30 swap either if i started with an m20 nor probably most 24V swaps
                89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                Comment


                  Originally posted by digger View Post
                  my logic is if you're going to swap an engine then you want it to be a significant step up (based on personal priorities) to what can be achieved by modifying what you already have installed using the costs to do an actual swap.
                  This is why I think I'm having such a hard time making a decision. I have an m10 car so any option is going to be fantastically better....
                  The most cost effective option I have is an m30 swap using the g240 thats currently in my car, and I love the sound of a sohc i6, but a friend of mine has offered to sell me his old s52 for $100 lol. It just needs the head to be rebuilt.(burns enough oil to make me nervous about failing smog). M20 sounds great too but cost to build a 2.8 is intimidating and since I'd be doing all the work for a swap anyways it makes sense to swap something that has a little more power in stock form.
                  1984 Delphin 318i 2 door

                  Comment


                    Originally posted by wworm View Post
                    This is why I think I'm having such a hard time making a decision. I have an m10 car so any option is going to be fantastically better....

                    The most cost effective option I have is an m30 swap using the g240 thats currently in my car, and I love the sound of a sohc i6, but a friend of mine has offered to sell me his old s52 for $100 lol. It just needs the head to be rebuilt.(burns enough oil to make me nervous about failing smog). M20 sounds great too but cost to build a 2.8 is intimidating and since I'd be doing all the work for a swap anyways it makes sense to swap something that has a little more power in stock form.
                    Not having access to a 100$ s52 I paid 250$ for a m54b30 from pick your part. I originally wanted a 2.8L m20, but the cost to hp just isn't worth it right now. M54 is alot cheaper (so far).

                    Sent from my SM-G970U using Tapatalk
                    91' 318is 90' 325is

                    Originally posted by Sonny
                    Buy the E30s, they ain't gonna last long
                    E30 can make you, E30 can break you
                    "He who controls the Nova's, controls the Boomers"

                    Comment


                      Originally posted by Motheye99 View Post
                      Not having access to a 100$ s52 I paid 250$ for a m54b30 from pick your part. I originally wanted a 2.8L m20, but the cost to hp just isn't worth it right now. M54 is a lot cheaper (so far).

                      Sent from my SM-G970U using Tapatalk
                      the deterring factor for me on an m54 is being unable to use the stock headers/cats for BAR. I do like the weight differential that an alu block offers though.
                      1984 Delphin 318i 2 door

                      Comment


                        Originally posted by Motheye99 View Post
                        I originally wanted a 2.8L m20, but the cost to hp just isn't worth it right now.
                        Yeah you don't get a lot for the extra 300cc given the cost. NA or Turbo.
                        @turbovarg
                        '91 318is, M20B25, T3/T04E 60 trim (15psi), megasquirt, coilovers, Z3 rack, cold AC
                        [b u i l d]
                        [Car of the month: April 2018]

                        0c8b7c9527af628a346878feb14bf757

                        Comment


                          Originally posted by wworm View Post
                          the deterring factor for me on an m54 is being unable to use the stock headers/cats for BAR. I do like the weight differential that an alu block offers though.

                          Did I say M54, I meant M52....;) They're very similar but M52 exhaust manifolds are better, so i've heard, I've never BAR'd before so I don't know how closely they check your block.
                          91' 318is 90' 325is

                          Originally posted by Sonny
                          Buy the E30s, they ain't gonna last long
                          E30 can make you, E30 can break you
                          "He who controls the Nova's, controls the Boomers"

                          Comment


                            Originally posted by Motheye99 View Post
                            Did I say M54, I meant M52....;) They're very similar but M52 exhaust manifolds are better, so i've heard, I've never BAR'd before so I don't know how closely they check your block.
                            Yeah. I've read that m52 manifolds work sometimes for smog visuals so might be good with BAR too.
                            1984 Delphin 318i 2 door

                            Comment


                              Originally posted by wworm View Post
                              This is why I think I'm having such a hard time making a decision. I have an m10 car so any option is going to be fantastically better....
                              The most cost effective option I have is an m30 swap using the g240 thats currently in my car, and I love the sound of a sohc i6, but a friend of mine has offered to sell me his old s52 for $100 lol. It just needs the head to be rebuilt.(burns enough oil to make me nervous about failing smog). M20 sounds great too but cost to build a 2.8 is intimidating and since I'd be doing all the work for a swap anyways it makes sense to swap something that has a little more power in stock form.
                              starting from an M10 going to M30 makes some sense. its like big brother
                              89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                              new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                              Comment


                                Originally posted by digger View Post
                                starting from an M10 going to M30 makes some sense. its like big brother
                                that's where my head was at until this s52 came along..now I'm conflicted lol
                                1984 Delphin 318i 2 door

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