M42 ITB build

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  • nbristow01
    Noobie
    • Nov 2018
    • 6
    #1

    M42 ITB build

    Hello all. New to this group but not cars. I have a 1970 2002 with an M10. 9.5 pistons, 292 cam and dual Jenvey Heritage ITBs. I have been running it a while but really want more upper end power. I have read a mix of posts where some say M42 will never have the power of M10 and vice versa.
    I acquired an M42 so decided to see what it can do. I just received my Dbilas manifold so I can use the Jenvey Heritage ITBs. I also have a set of 269 cams for it. ECU is Haltech, which runs my M10 and use LS coils. I now this can cause issues to ask but.....based on what you guys know...what HP can I expect with this setup on 93 octane? I love the high rev capacity of the M42 and I am aware the power willClick image for larger version Name: Jenvey on M10.jpeg Views: 1559 Size: 62.0 KB ID: 9883893 be higher up...which is fine.
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    • roguetoaster
      R3V OG
      • Jan 2012
      • 7753
      #2
      Guesswork, but with a stock bottom end/exhaust, maybe 165-170HP peak at the crank, maybe in the low 6K RPM range, add 5-10 for a non stock exhaust if well installed. So much depends on other items like fueling, better mixture reading, etc.

      While I love an M42, the M10 does seem to make great numbers with "bolt ons," whereas the M42 seems to need more fine tuning.

        Comment

        • harv
          E30 Addict
          • Nov 2004
          • 555
          #3
          If your going into an M42 why not increase the stroke with the diesel crank. I think it can get to 2.1L

          not an endorsement as I don’t have any experience with these guys but....
          https://youtu.be/EKIr68vWYEU
          The Revolution will not be televised.

            Comment

            • nbristow01
              Noobie
              • Nov 2018
              • 6
              #4
              Originally posted by harv
              If your going into an M42 why not increase the stroke with the diesel crank. I think it can get to 2.1L

              not an endorsement as I don’t have any experience with these guys but....
              https://youtu.be/EKIr68vWYEU
              Motor runs good so I do not want to do a stroker build. See how this does. If its weak sauce for the price to the stroker I can go turbo cheaper and have more power. Will see how this does first

                Comment

                • nbristow01
                  Noobie
                  • Nov 2018
                  • 6
                  #5
                  Originally posted by roguetoaster
                  Guesswork, but with a stock bottom end/exhaust, maybe 165-170HP peak at the crank, maybe in the low 6K RPM range, add 5-10 for a non stock exhaust if well installed. So much depends on other items like fueling, better mixture reading, etc.

                  While I love an M42, the M10 does seem to make great numbers with "bolt ons," whereas the M42 seems to need more fine tuning.
                  I have a built M10 in the car now, fresh build with the ITBs, forged 9.5, 292 cam etc. I can assure you it is not over 140HP.. Many guys inflate the HP gains with the "butt dyno" estimates..which are always high. I think a M42b build that can push 160-170HP NA will be a blast. I have a Haltech ECU and can fine tune to near perfect timing and AFRS and all load and RPM ranges.

                  I also think the koogle 90s (actually great velocity stacks) will assist the lower end as well

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