MY 70 Z28 RS COPO ?

Discussion in 'Project Progress' started by WANNARUN, Mar 13, 2018.

  1. Bill Neumiller

    Bill Neumiller New Member

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  2. WANNARUN

    WANNARUN Veteran Member

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  3. WANNARUN

    WANNARUN Veteran Member

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    92D05531-F1B3-422E-A8BA-C519B9281547.jpeg 70 LT-1
     
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  4. COPO

    COPO Veteran Member Lifetime Gold Member

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    Jeff, are you planning on getting the smog system back on?
     
  5. WANNARUN

    WANNARUN Veteran Member

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    I would like to but the original owner got rid of it. I saw a original one for sale but it was a lot of money. I have also seen reproduction ones. What would you do and where could I buy your suggestion. Thanks
     
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  6. COPO

    COPO Veteran Member Lifetime Gold Member

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    If I didn’t have one then I’d buy a repop cause people want stupid money for a used one that doesn’t turn. My orig pump front bearing seized on me after making a few 6000 rpm hits. I want the pump functional so it’s still keeping the tubes cool with airflow from the pump. Without the pump creating air flow, the smog tubes have an avg temperature of 382F. Avg EX manifold temp of 421F.
    I still haven’t decided whether to dig out the front bearing myself from the sealed epoxy or send the pump out locally for rebuild for about $350. They said they couldn’t guarantee if something may not break. Sending it to the USA is out of the question due to the dollar exchange. So currently the pump and tubes are off the engine.
     
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  7. WANNARUN

    WANNARUN Veteran Member

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    Thanks for the information.
     
  8. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Keep in mind the exhaust temps will be different with a stock cam. The AIR system was designed to create a post combustion process in the exhaust manifolds. Air was pumped in and the heat from the exhaust ignited the unburned raw gas due to the high overlap, long duration stock cam. This would then RAISE the temps in the manifold and the connecting tubes. Any other cam may not behave the same way. You may get higher or even lower exhaust temps with the system disabled and the stock cam.
     
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  9. COPO

    COPO Veteran Member Lifetime Gold Member

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    Without the pump the pipes are so hot they will give you 1st degree burns. With the pump on the car you can immediately touch the pipes after shutting the engine off. I used to always be in reading the plugs after a run and touching the pipes which were barely warm. Even low HP engines got smog and it all worked the same. https://my1970z28.com/COPO/smog.htm
     
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  10. WANNARUN

    WANNARUN Veteran Member

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    DCC1A6ED-E86D-4126-AE4D-54BF26B67115.jpeg Original hard to find bright liug nuts.
     
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