Another 2.7 Stroker Question

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  • digger
    R3V Elite
    • Nov 2005
    • 5939

    #16
    Originally posted by Gary Horneck
    Autocross/Rallycross results FTW ;D Only an ass rely's on Dyno data to strut one's stuff.
    why not just post a chart i pressume you have dynoed it? it all adds value to the forum when people share. Sure some people who dont know any better will look at only one number on the chart and not be impressed if its not a high number but others like to see what works and what doesn't particularly with respect to area under the curve difference between 885 and 731 etc....not everyone wants a race engine.

    most impressive thing ive seen is a mild 2.7 pretty much match a S38B36 swapped E30 for torque below 3k at a dyno day....
    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

    • timmyr77
      Grease Monkey
      • Jun 2012
      • 353

      #17
      Originally posted by SDemetris
      .25mm? That's not even worth doing? And how is an adjustable cam gear gonna help?

      You will adjust the cam whatever number of degrees it needs to be adjusted so there won't be valve to piston contact if you do take enough off. You could also mill the block.
      I think .25 has a noticable enough difference. I haven't done te math but compression should be close to 8.75:1 instead of 8.43:1. That is higher then a stock 8.5:1 on the b25

      Comment

      • timmyr77
        Grease Monkey
        • Jun 2012
        • 353

        #18
        Speaking of hp and all that, I haven't dynoed my car yet, but what do you guys think my car would put down at the wheels? 150 at least?
        Specs :
        2.7 block rebuilt
        885 head rebuilt and shaved .27mm
        17lbs single mass flywheel
        Ac delete
        Power steering delete.
        Mechanical fan delete
        Dinan chip

        I plan on getting a m30 afm and 19lb/hr injectors and sssquid tune for that set up?
        What's your thoughts.
        Sorry op. Don't mean to high jack your thread

        Comment

        • nando
          Moderator
          • Nov 2003
          • 34827

          #19
          Originally posted by timmyr77
          You will adjust the cam whatever number of degrees it needs to be adjusted so there won't be valve to piston contact if you do take enough off. You could also mill the block.
          I think .25 has a noticable enough difference. I haven't done te math but compression should be close to 8.75:1 instead of 8.43:1. That is higher then a stock 8.5:1 on the b25
          B25 is 8.8:1 and isn't really enough for an agressive cam although a mild 272 will work fine
          Build thread

          Bimmerlabs

          Comment

          • timmyr77
            Grease Monkey
            • Jun 2012
            • 353

            #20
            I always read that the super eta pistons were 8.8:1 and thought the b25 was 8.5:1. I could be wrong

            Comment

            • digger
              R3V Elite
              • Nov 2005
              • 5939

              #21
              Originally posted by timmyr77
              I always read that the super eta pistons were 8.8:1 and thought the b25 was 8.5:1. I could be wrong
              that's ass about
              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

              • nando
                Moderator
                • Nov 2003
                • 34827

                #22
                Originally posted by timmyr77
                I always read that the super eta pistons were 8.8:1 and thought the b25 was 8.5:1. I could be wrong
                yeah, that's backwards.
                Build thread

                Bimmerlabs

                Comment

                • timmyr77
                  Grease Monkey
                  • Jun 2012
                  • 353

                  #23
                  Damn.... I've been wrong all this time.

                  Comment

                  • SDemetris
                    Noobie
                    • Jul 2014
                    • 6

                    #24
                    Originally posted by timmyr77
                    You will adjust the cam whatever number of degrees it needs to be adjusted so there won't be valve to piston contact if you do take enough off. You could also mill the block.
                    I think .25 has a noticable enough difference. I haven't done te math but compression should be close to 8.75:1 instead of 8.43:1. That is higher then a stock 8.5:1 on the b25
                    OK thanks. I'll probably just mill the head. I figure I won't take the block out unless it's actually necessary. Thanks for the help.

                    Comment

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