spark plug heat range

Discussion in 'PSI Superchargers Tech Questions' started by SoDak, Jan 25, 2015.

  1. SoDak

    SoDak Active Member

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    roots blown alky all out 30 psi chevy

    Can we run too cold of a plug?

    What are the goods and bads of -9, -10 & -11?
     
    #1
    SoDak, Jan 25, 2015
  2. Mike Canter

    Mike Canter Top Dragster
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    The heat range of a spark plug referes to the ability of the center electrode to disapate heat. The reason you need to disapate the correct amount of heat is for a gasoline motor so the plug does not foul. A methanol motor does not foul a plug's center electrode. The only thing we are interested in is if the center electrode gets hot enough to cause pre-ignition so to prevent this we run the coldest plug we can get. To answer your question is No you cannot be too cold with a -11 plug in a methanol motor.
     
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    Mike Canter, Jan 25, 2015
  3. SoDak

    SoDak Active Member

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    Now I want to throw extended reach into the mix.

    Is there any chance that colder plugs or extended reach could change the ideal ignition timing setting?
     
    #3
    SoDak, Jan 26, 2015
  4. SoDak

    SoDak Active Member

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    Do you run -11 in your engines?
     
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    SoDak, Jan 26, 2015
  5. Mike Canter

    Mike Canter Top Dragster
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    I run either -10 or -11 depending on what is available. Advancing ignition can create more heat in the chamber so a colder plug is desired to prevent it getting hot enough to have the plug act like a glo-plug. An extended tip plug is going to heat up more on the center electrode and the ground strap and should not be used.
     
    #5
    Mike Canter, Jan 26, 2015
  6. SoDak

    SoDak Active Member

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    Do you think that an ignition timing that has been optimized for a -9 would need to be changed (for max power) if going to a -10 or -11?
     
    #6
    SoDak, Jan 26, 2015

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