Pushrod question

Discussion in 'PSI Superchargers Tech Questions' started by superchargedwarrior, Oct 19, 2009.

  1. superchargedwarrior

    superchargedwarrior New Member

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    I have an Oddys 540 KB/Olds 14* Big chief Motor. I am tearing down for the winter freshen & noticed that the intake pushrods are 7/16 diameter & the exhausts are 1/2. Seems to me that it should be the other way around. Anybody know why it would be set up this way?
     
    #1
    superchargedwarrior, Oct 19, 2009
  2. secondwindracing

    secondwindracing top alcohol

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    would there be a clearance issue?Dave
     
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    secondwindracing, Oct 19, 2009
  3. Moparious Maximus

    Moparious Maximus Member

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    The exhaust valves are harder to open because they still have pressure in them when the valves open, I dont think its a huge deal on the alky motors, the nitro boys have it bad.
     
    #3
    Moparious Maximus, Oct 20, 2009
  4. oddysautomotive

    oddysautomotive New Member

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    It is set up this way because the exhaust valve opens under extreme cylinder pressure. Therefore 1/2 in. diameter pushrods are needed. 7/16th pushrods are fine on the intake. There is no cylinder pressure to open agaisnt and port walls will only allow this daim. push rod.
     
    #4
    oddysautomotive, Oct 20, 2009

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