M30 Turbo Questions

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  • Tino-m30b35
    Member
    • Feb 2011
    • 56
    #1

    M30 Turbo Questions

    Hi Guys

    Rebuilding my M30B35 turbo motor at the moment, and have the following question. Is it safe to shave the piano top pistons flat? Is there enough meat? Getting custom pistons in SA for this motor is turning out to be quite expensive.

    Appreciate your help.

    Cheers!
    92 Opel Monza CLi 200i8v Exec
    92 Opel Rekord 380GSiV6
    87 BMW E30 335i (M30B35)
    91 BMW E34 520i (M50B20) with Mtech Turbines
    95 Hyundai Elantra with Mitsu 4G63
    Three Aircooled VW Beetles
    17.8Litres, 38cylinders, 10Cams and 84valves

    Tags: None
    • Bearmw
      E30 Fanatic
      • Aug 2010
      • 1323
      #2
      I would just turbo the B35 and keep the better flow characteristics but understanding that the block may not be as strong as a B34. Ideally I would use a B35 head and pistons in a B34 block.
      Never argue with stupid people, they will drag you down to their level and beat you with experience. -Mark Twain

        Comment

        • Tino-m30b35
          Member
          • Feb 2011
          • 56
          #3
          Motor is B35.B35 head also. I am asking about the High comp pistons. Safe to machine?
          92 Opel Monza CLi 200i8v Exec
          92 Opel Rekord 380GSiV6
          87 BMW E30 335i (M30B35)
          91 BMW E34 520i (M50B20) with Mtech Turbines
          95 Hyundai Elantra with Mitsu 4G63
          Three Aircooled VW Beetles
          17.8Litres, 38cylinders, 10Cams and 84valves

            Comment

            • Bearmw
              E30 Fanatic
              • Aug 2010
              • 1323
              #4
              I'm unclear on which pistons you actually have, the B35 9:1 pistons or the 10:1 high compression B34 "piano tops"? What compression ratio are you seeking?
              Never argue with stupid people, they will drag you down to their level and beat you with experience. -Mark Twain

                Comment

                • Tino-m30b35
                  Member
                  • Feb 2011
                  • 56
                  #5
                  Hey... I have the piano top pistons. My motor is a M30B35.
                  92 Opel Monza CLi 200i8v Exec
                  92 Opel Rekord 380GSiV6
                  87 BMW E30 335i (M30B35)
                  91 BMW E34 520i (M50B20) with Mtech Turbines
                  95 Hyundai Elantra with Mitsu 4G63
                  Three Aircooled VW Beetles
                  17.8Litres, 38cylinders, 10Cams and 84valves

                    Comment

                    • Tino-m30b35
                      Member
                      • Feb 2011
                      • 56
                      #6
                      Motor is out at the moment. The only other thing I could do now is to destroke it with a M30B28 80mm crank, but I fear that it would drop way too low.

                      These motors doesn't get much attention here, so I would have to make do with what I have.

                      Just some insight.
                      92 Opel Monza CLi 200i8v Exec
                      92 Opel Rekord 380GSiV6
                      87 BMW E30 335i (M30B35)
                      91 BMW E34 520i (M50B20) with Mtech Turbines
                      95 Hyundai Elantra with Mitsu 4G63
                      Three Aircooled VW Beetles
                      17.8Litres, 38cylinders, 10Cams and 84valves

                        Comment

                        • Insaini
                          Member
                          • Sep 2012
                          • 74
                          #7
                          Hi Mate
                          I have seen an elderly gentleman mill/shave the top of the piano pistons. I'm going to lean towards it being OK to do as he builds racing/turbo motors and has been doing so for some time now.
                          BTW, I'm in Australia, so not sure if there is any difference in the pistons.

                            Comment

                            • Tino-m30b35
                              Member
                              • Feb 2011
                              • 56
                              #8
                              Thanks

                              So, milled the piano tops flat, and removed another 1mm, could anyone help me with the math? Cos the calculators are so confusing...

                              Thanks in advance
                              92 Opel Monza CLi 200i8v Exec
                              92 Opel Rekord 380GSiV6
                              87 BMW E30 335i (M30B35)
                              91 BMW E34 520i (M50B20) with Mtech Turbines
                              95 Hyundai Elantra with Mitsu 4G63
                              Three Aircooled VW Beetles
                              17.8Litres, 38cylinders, 10Cams and 84valves

                                Comment

                                • LowR3V'in
                                  R3V Elite
                                  • Feb 2004
                                  • 4209
                                  #9
                                  I remember seeing a post on the compression in e30tech but it's dead now you can't see any threads.

                                    Comment

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