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Thread: Is Cold Idle Too fast ?
          
   
   

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  1. #1
    MelloYello's Avatar
    MelloYello is offline CHR Member Visit my Photo Gallery
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    Is Cold Idle Too fast ?

     



    Here is what my 2bbl carb on the 289 does on a cold crank and I will ask my question at the end, OK?

    here is my cold engine - - the outside temp around 80 degrees



    pump accelerator and crank - - engine running at 1300 RPMs



    allow to idle at 1300 RPMs for approx a minute and then tap accelerator - - - engine drops to 1000 RPMs



    allow engine warm to 190 at 1000 RPMs and then tapped accelerator again - - - engine dropped to 750 RPMs and idling smoothly



    OK, I have said all of that to ASK this question:
    Considering that if I don't crank it often then the lifters drain out and will tap some at cold crank. ??will the 1300RPMs?? damage my engine while pumping up and filling the lifters - - AND - - - should I get the idle lower at initial cold crank? ALSO, is the small phillips head screw behind the electric choke housing the way to change my cold idle???

    (footnote: the reason this is so long is because of my limited vocabulary - - - pic worth a 1000 words yanno?)
    .
    " I'm drinking from my saucer, 'cause my cup is overflowed ! "

  2. #2
    shine's Avatar
    shine is offline CHR Member Visit my Photo Gallery
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    a 1/4 in ratchet wrench is what i use. i set the cold idle as low as it will stay running .

  3. #3
    MelloYello's Avatar
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    Thanks Shine, do I do that at the choke when first cranked?
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  4. #4
    shine's Avatar
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    yes. remember once you hit the key the coil heats. i disconnect the choke while setting the high idle.

  5. #5
    MelloYello's Avatar
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    will do, I"ll let you know if I'm successful - - TA
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    " I'm drinking from my saucer, 'cause my cup is overflowed ! "

  6. #6
    Rrumbler is offline CHR Member Visit my Photo Gallery
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    I always used a sort of rule of thumb that cold idle be 300 t0 500 over hot idle, and the step downs on yours sound just about right to me.
    Rrumbler, Aka: Hey you, "Old School", Hairy, and other unsavory monickers.

    Twistin' and bangin' on stuff for about sixty or so years; beat up and busted, but not entirely dead - yet.

  7. #7
    34_40's Avatar
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    I agree with Rrumbler, although hot idle sounds high to me.

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