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what did BMW do, and how do I do it? valve train noises.

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    #1

    what did BMW do, and how do I do it? valve train noises.

    MY first bmw was an 87is.. m20 of course but it always had a loud valve train, NO MATTER WHAT! my friend goes and gets an 89.. absolutely silent valve train, now Im back into a 325is and its loud as fuck again....

    even my friends cars the early cars are loud, the late cars are quite and thats just how it works, dont tell me other wise I WANT TO KNOW WHY!

    its not mileage, its not anything, they did something.

    BTW, that car with the silent valve train motor blew shortly after, and my current m20 was silent when I bought it, then blew the head, now im on another head and this one is loud... valves adjusted so many times I wore out the bran new Valve cover gasket.

    thanks for listening but hopefully TIA for an answer.

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    #2
    some noise is normal. If your valves are adjusted too tight the engine will run like shit when cold and idle like crap. However the oil you are running makes a difference too. 5w30 is just too thin for these engines and it WILL exentuate a loose valvetrain. Unless it's very cold (like 0*F) I wouldn't use it.

    15w40 in the winter and 20w50 in the summer is good for an average climate, I run it up here in Canada eh.

    Don't forget that you should re-adjust your valves again soon after a head swap. And for the most accurate adjustment it should be done bone cold to the cold spec's.

    '89 Alpine S52 with goodies

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      #3
      Good rockers and shafts, good eccentrics (no flat spot) and the perfect adjustment .25mm cold.

      After the 1st 50 times you do an m20 valve adjustment you get the hang of it.
      I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃x ∈ S : φ(x)) → (∀x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

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        #4
        .25mm right on the money.

        we all know what im talking about dont try to ignore it.

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          #5
          I've heard properly adjusted early M20B25's with quiet valves and late production with noisy valves. It isn't that BMW dis something special to later heads, but rather how much wear there is in the components of the head.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

          Comment

            #6
            Originally posted by Liam View Post
            Good rockers and shafts, good eccentrics (no flat spot) and the perfect adjustment .25mm cold.

            After the 1st 50 times you do an m20 valve adjustment you get the hang of it.
            Just to re-iterate.
            I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃x ∈ S : φ(x)) → (∀x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

            Comment

              #7
              Originally posted by Liam View Post
              Just to re-iterate.

              im gonna do it again tomorrow then! maybe three times in a row.

              Comment

                #8
                If the cams, eccentrics, rockers, valve stems, or valve guides are worn, there will be valve noise no matter how perfectly the valves are adjusted.
                The car makes it possible, but the driver makes it happen.
                Jim Levie, Huntsville, AL

                Comment

                  #9
                  I've always noticed. A car (no matter what it is) always runs its best right before it blows up
                  First: 1984 318i
                  Second: 1987 325
                  Third: 1987 325is
                  Current: 1990 325i (Soon To Be 335i)

                  Comment

                    #10
                    Originally posted by Spinning Tires View Post
                    I've always noticed. A car (no matter what it is) always runs its best right before it blows up
                    That is one of the many "Absolute Laws" that governs all machinery.
                    I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃x ∈ S : φ(x)) → (∀x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

                    Comment

                      #11
                      I guess someone sold me a "REBUILT" head and not a Rebuilt head.

                      FML

                      Comment

                        #12
                        I switched to adjusting mine hot - there's a different spec for it in the bentley. it's trickier and I wouldn't do it that way until you get the hang of it, but my valvetrain is much quieter.
                        Build thread

                        Bimmerlabs

                        Comment

                          #13
                          Originally posted by Tree18is View Post
                          I guess someone sold me a "REBUILT" head and not a Rebuilt head.

                          FML
                          Well, to truly rebuild a head costs a whole handful of money, case in point,

                          I am a tech and get parts wholesale. Just the parts for one I did for myself cost a little over $700 not including the cam (top of the line OE stuff... I didn't want to do it twice).

                          The biggest cause of excess noise I have found is caused by worn rockers, rocker shafts and eccentrics, but I would suppose guides etc could as well.
                          I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃x ∈ S : φ(x)) → (∀x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

                          Comment

                            #14
                            I might swap over eccentrics from the Quiet head and see what happens.

                            Comment

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