Home Forums Technical Questions Valve adjustment dilemma

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  • sidehill
    Participant
    Post count: 31

    Are there any rockers that allow the valves to be adjusted to loose-zero when using AirCooled’s heavy duty aluminum push rods?

    I just got this car and wanted a qualified mechanic to do the first adjustment and advise me on the clearance.  So now, instead of 0.006 which I thought was the clearance, he has adjusted them to loose-zero.  After I reiterated for the second time that the PR’s are aluminum he still insisted that zero is OK because of the rockers.

    Does this make any sense?

    Franz
    Keymaster
    Post count: 2396

    If you set them at 0 with the engine warm they will be good.

    We usually set aluminum pushrods with 1.1 : 1 rockers at .004″-006″ with the engine cold and head studs torqued.

    Rustabus
    Participant
    Post count: 1340

    Franz answered, thread ended!!!! 😉 Heh!

    sidehill
    Participant
    Post count: 31

    Thanks Franz

    They were set at 0 with the engine cold.  The mechanic that set them tried to tell me that they were steel push rods, but I know they are aluminum.  Then he changed his story and said that 0 is OK with aluminum because of the type of rocker I have.  I just feel like he didn’t want to admit his error.

    John Jones
    Keymaster
    Post count: 4753

    zero for steel, ,006 for aluminum.  period… 😎  set cold.  😎         I have been contacted by shops that are working on one of our builds and want to know what to set the valves at…  what size cam blah blah blah… don’t matter… 😎      Seems in general, if you run ratio’s, you run steel.    Mine is backwards right now from the norm…. I run steel rods with stock rockers…  😎   It really doesn’t matter tooo much….  just not tight!  😎

    sidehill
    Participant
    Post count: 31

    Thanks.  I dropped the car at your shop today, along with a list of the specs on the car, as I understand them to be.  The engine could have been changed from these specs, since it went through a couple of later owners.  So it is possible that it has steel push rods instead of aluminum but I seriously doubt it.

    The engine has been machined for hydraulic lifters, but after one collapsed the first owner put in solid.  Not sure why.  I’m still in contact with him and he thinks I should put in hydraulic again.  What would be the cost for that?  For now though just adjust the valves correctly.

    As for the CV clicking I mentioned to Pat, I don’t think it could be the angle since these are 944 cvs, plus it didn’t click when I took it too this guy and didn’t bind this afternoon when I jacked it to full droop.  First owner just mentioned clocking of the CV’s, something about the lobes on the races.  If you search “Clocking” in the Samba HBB forum there is a thread about it.

    Pat K
    Keymaster
    Post count: 851

    Nice to meet you Steve. We’ll get it all worked out. 👍👍

    We will build it if it comes.

    Franz
    Keymaster
    Post count: 2396

    They only click under load.

    944 cv joints are 100mm the same as thing or 68-79 bus

    93o cv joints are 108mm, and use 28 spline axles.

    you likely need 930s to make your setup work right. I believe I told you this months ago before you raised it.

    sidehill
    Participant
    Post count: 31

    I don’t seem to be able to past links when I reply.  This is my third try this evening, so I’ll forgo the links.

    If you google Blindchickenracing cv joints 101, the first link takes you to a page with the specs on the various CVs, showing 944s capable of 22 degrees.

    If I truly have 944’s I don’t think my DS angle is too extreme.

    I have also found a thread on the Samba showing how a CV can be installed backwards.  Is this a possibility? I have copied it to a Word document but don’t know how I can get it too you.  I’m out of town until the weekend.

    Per Blind chicken racing.

    Type 1 is 12 deg

    Type 2 is 17

    Type 4 is 22 (aka 944)

    930 is 25

     

     

    Rustabus
    Participant
    Post count: 1340

    And I thought this thread was done!!! 😉

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