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cam for turbo engine??

Discussion in 'High Tech for Old Iron' started by 66larkgs, Dec 18, 2011.

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  1. pmuller9

    pmuller9 Well-Known Member

    Paul

    Don't give up

    With all the research you have been doing, you know the valve lift needs to be less than .500"
    What you don't know is the effective rocker ratio with the nailhead rockers.

    Put the stock cam in the block, put a set of light springs on the intake and exhaust valves for just cylinder #1 and put the head on the block with just a couple of bolts.
    Install the rocker arm assembly with lifters and pushrods for cylinder #1 only.
    Put a dial indicator on the lifter and the valve retainer.
    Then turn the cam and chart the valve lift for every .100" increment of lobe lift. You will need to go further than the stock cam lift,
    so put feeler gauges between the top of the cam lobe and the lifter to get near .500 valve lift.
    You will be able to see if the rocker ratio is linear and you can post all the numbers as a reference for all other board members to see.

    Once you know the lobe lift required to give you a .450 to .475 valve lift,
    then you can simply call up TA and ask for a 215/215, lobe lift xxx on a 113 lobe center and they will grind you a cam.
    Mark will also get you a cam.

    Paul

    BTW we used Comp once for a turbo cam and they over spec'd the duration for our application.
    The cam they specified for you is comparable to a blower grind
    http://schneidercams.com/284Hnailheadhydraulic.aspx
     
    Last edited: Jan 16, 2012
    pmuller9, Jan 15, 2012
    #21
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