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Thread: 'Motorsport' Rocker Shafts

  1. 06-20-2018, 05:27 AM #1
    chris_seven
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    'Motorsport' Rocker Shafts

    I believe that the 906 style rocker arm used a rocker shaft supplied by Porsche Motorsport, that were a black colour.

    I have read posts suggesting that these shafts were Tenifer treated but this doesn't make much sense as I think that the ends would be likely to deform due to the residual stresses that this process would introduce.

    I tend to believe that the shafts were treated with a Manganese Phosphate coating which improves lubricity and helps to hold an oil film.

    I hope that someone has a definitive answer, if not does anyone have a scrap Motorsport Shaft that we could have tested?

    The 1967 Investment Rocker Arm was also used without a bush but I believe that this arm was used with a standard shaft and generally suffered from problems of 'galling'.

    We currently make surface treated shafts but I am trying to review surface roughness and hardness specifications to match the new 906 Rocker Arms we are manufacturing.
    Last edited by chris_seven; 06-21-2018 at 01:08 AM.
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  2. 06-20-2018, 08:16 AM #2
    gled49
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    We also believe the shafts were phosphates. The non bushed rockers can gall and seize on a standard shaft, as I discovered once, but not always. I've built a bunch of solid rocker engines, I just send shafts out for Parkerizing and have never had a problem. Gordon
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  3. 06-25-2018, 06:47 AM #3
    Olivier
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    Chris,

    Any chance to see a pic of the 906 rockers?

    Thx

    Olivier.
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  4. 06-25-2018, 11:51 AM #4
    gled49
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    Here are some RSR rockers, same as 906 but have 2 spiral oil groves on load side of rocker for better lubrication. Gordon
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