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    Ultimate N/A M20 racing engine?

    What are the realistic limits of an M20 ?

    If you put 84mm crank, 12.5 cr pistons, H-beams, Rama roller cam kit, ITB's and proper headers... what can you expect about DIN-power from crank ? Anything like Euro S50B32 ? S54 level might be out of range ?

    #2
    yes, you can make S50B32/S54B32 power....the most important part is the cylinder head modifications
    Last edited by digger; 03-30-2019, 04:12 AM.
    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

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      #3
      Originally posted by digger View Post
      yes, you can make S50B32/S54B32 power....the most important part is the cylinder head modifications
      So that it means bigger valves and some experienced wizardry on porting?

      I have a gut feeling that bone stock 885 could support max 300hp. They seem to give "theoretically 280hp amount of flow" on superflow scale which translates to about 10% more in real life in racing applications.

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        #4
        I don't think I've ever seen a bone stock 885 head do that.
        AWD > RWD

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          #5
          who would be the company to go to for a top notch head?
          1990 kashmir beige BMW e30 327i
          1993
          muggello rot BMW e36 M3 Gruppe A Euro
          1990 GP weiss Porsche 964 C2
          1997 schwarz II BMW e36 328iS supercharged

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            #6
            Originally posted by FRODADDY View Post
            who would be the company to go to for a top notch head?
            Bimmerheads.
            "Tires are our fuse" -Matt Juengel
            1986 325e Sedan | M20B27 parts available for sale |

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              #7
              Originally posted by hasa View Post
              What are the realistic limits of an M20 ?

              If you put 84mm crank, 12.5 cr pistons, H-beams, Rama roller cam kit, ITB's and proper headers... what can you expect about DIN-power from crank ? Anything like Euro S50B32 ? S54 level might be out of range ?

              Just brows Rama's site, his m20 made something like 275whp. Knight did one with triple carbs that was around 300. I recently did a head for a 2.5 (not stroked) m20b25 with 288 Schrick cam, 12.5:1 and headers, made 208whp with the stock single throttle and manifold. I've also done a few ITB engines that are making well into the 200's non-roller cams.

              Originally posted by FRODADDY View Post
              who would be the company to go to for a top notch head?
              Go with someone who has a flow bench at least.
              john@m20guru.com
              Links:
              Transaction feedback: Here, here and here. Thanks :D

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                #8
                What about the bimmerheads?
                1990 kashmir beige BMW e30 327i
                1993
                muggello rot BMW e36 M3 Gruppe A Euro
                1990 GP weiss Porsche 964 C2
                1997 schwarz II BMW e36 328iS supercharged

                Comment


                  #9
                  Originally posted by hasa View Post
                  So that it means bigger valves and some experienced wizardry on porting?

                  I have a gut feeling that bone stock 885 could support max 300hp. They seem to give "theoretically 280hp amount of flow" on superflow scale which translates to about 10% more in real life in racing applications.
                  no around 260 bone stock, its not very good.

                  Originally posted by FRODADDY View Post
                  What about the bimmerheads?
                  i personally wouldnt go with anyone who offers generic ported heads, or stage 1,2, 1001 type heads if you want s54 power. you really need a custom job and they will ask alot of quesions so they can tailor the work accordingly to suit the kind of engine you want, in truth its going to costs a bomb and yes they will use a flow bench to develop the port shapes, make sure the air speeds are acceptable and give you a flow sheet at the end so you know atleast know there is potential for the engine to make more power than with the stock head. If the porter is really good you'll probably have to wait several months for the work as they'll be in high demand

                  even my MM rally ported head has all this grinding and smoothing done but it doesnt move any more air than a stock port at high lift so there are ported cylinder heads and well ported cylinder heads
                  Last edited by digger; 03-31-2019, 01:45 AM.
                  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


                    #10
                    Originally posted by ForcedFirebird View Post
                    Just browse Rama's site, his m20 made something like 275whp. Knight did one with triple carbs that was around 300. I recently did a head for a 2.5 (not stroked) m20b25 with 288 Schrick cam, 12.5:1 and headers, made 208whp with the stock single throttle and manifold. I've also done a few ITB engines that are making well into the 200's non-roller cams.

                    Go with someone who has a flow bench at least.
                    x2 ... all of this....
                    Simon
                    Current Cars:
                    -1986 BMW 325e & 1968 Datsun Roadster 2000
                    Previous Car Count : 21 ... and climbing...

                    Make R3V Great Again -2020

                    Comment


                      #11
                      If I wanted big power from an m20, I would take it somewhere that has proven they can do it. As far as I know, Knight Engines in Aus are the only ones working M20 heads to that level, but you're sure as shit going to pay a premium for the service.
                      Originally posted by priapism
                      My girl don't know shit, but she bakes a mean cupcake.
                      Originally posted by shameson
                      Usually it's best not to know how much money you have into your e30

                      Comment


                        #12
                        Call Korman BMW. They know a lot about it. Were very helpful for me during Das Beast build.

                        https://www.kormanautoworks.com/
                        "And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"

                        Das Beast build thread

                        Comment


                          #13
                          Originally posted by Andre3127 View Post
                          Bimmerheads.
                          i'm sorry, but no. for a top-notch head, the answer is Rebello.
                          past:
                          1989 325is (learner shitbox)
                          1986 325e (turbo dorito)
                          1991 318ic (5-lug ITB)
                          current:
                          1985 323i baur (project to resume soon...)
                          2013 ninja 300 (way more fun than a car)

                          Comment


                            #14
                            Go with someone who has a flow bench at least.
                            Location: WOT-Tech, Florida

                            Comment


                              #15
                              I don’t think I’ve ever seen anyone comment on this Korman autoworks in the forum? They’re pretty close to me, just curious if they have a solid rep or not?
                              My son has the 1987 325e, 2 door, 5speed
                              I daily the 1989 325i, 4 door, 5speed

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