spark plugs

Discussion in 'PSI Superchargers Tech Questions' started by crashly, Feb 15, 2009.

  1. crashly

    crashly Member

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    engine is 350 cube , 23 deg sbc , alcohole fuel , 9.2 : 1 comp , 28-30 psi boost , ( this is a twin turbo engine...)

    currently 28 deg timing locked.

    the "blue" timing mark / line is about 2 mm from the base ring.
    NO cad burnt off base ring

    the current plugs are ngk R5672A - 9

    Ignition is msd 10 plus , with alternater


    Question:
    i want to run a couple more degrees timing....
    should i have a colder plug , to move the "blue" line backwards.... towards the radius of the earth strap ??
     
    #1
    Last edited: Feb 15, 2009
    crashly, Feb 15, 2009
  2. Mike Canter

    Mike Canter Top Dragster
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    A colder heat range plug only affects the porcelein temperature and only makes a difference in a gasoline motor and reading the fuel ring. If you are reading the blue line correctly and if you say that the blue line is where it is then you are pretty well advanced all you are going to go. Any more advance will probably nip the ground strap. Regardless I would be running -10 plugs with that amount of boost. What you say doesn't make sense that you have the blue line that far down on the ground strap and not burning the cad off the base ring. If no cad has burned off the base ring then you are too rich and the temps are too cold but remember the timing and the mixture go hand in hand. If you take fuel out with were you say the blue line where it is I think you might get some detonation. Can you take a good digital picture showing me the blue line and email it too me at mike.c@mindspring.com?
     
    #2
    Mike Canter, Feb 15, 2009
  3. crashly

    crashly Member

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    yep, mike no worries
    i am about .3 to .4 gal too much
    i was creeping up on timing, and now want a little more, and then was going to pull fuel out...

    will try get digital pic soon

    thanks
    ash
     
    #3
    Last edited: Feb 15, 2009
    crashly, Feb 15, 2009
  4. GregM784

    GregM784 Member

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    Ash, try some pop. Say, 50% otta do it.
     
    #4
    GregM784, Feb 15, 2009
  5. crashly

    crashly Member

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    hey cone hunter...
    what do you think pop and turbos will go like ???
    :cool:

    i'm not sure mate....
     
    #5
    crashly, Feb 15, 2009
  6. GregM784

    GregM784 Member

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    hehe, hmmmm, BANG.

    But you'd have a great seat.
     
    #6
    GregM784, Feb 15, 2009

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