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  1. #1
    philip_gpr's Avatar
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    BR8ES versus BPR8ES sperk plugs

    I learned something new today. There is a big difference between a BR8ES spark plug and a BPR8ES one.

    The BR8ES has a non-projected firing end. Meaning that the insulator does not project above the metal shell is looking at it from a side profile.

    The BPR8ES has a projected firing end, so it will project farther into the combustion chamber. From the side you would actually be able to see the insulator sticking above the shell.

    So the BRP8ES projects further into the cylinder head. This means there is a very real possibility it would physically hit the piston when the piston is at TDC. This risk rises if compression has been raised.

    I do not recommend using a BRP8ES in a GPR motor.

    The BRP8ES is better suited for being used in a low compression motor like you would find in a lawnmower.


  2. #2
    philip_gpr's Avatar
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  3. #3
    krispaintballz's Avatar
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    ouch!

  4. #4
    from what I understand it is a Polaris plug...

  5. #5

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    that sure could be a costly mistake!

  6. #6
    Quote Originally Posted by cuda167 View Post
    that sure could be a costly mistake!
    yup good thing I asked in the other thread...

  7. #7
    john zigler's Avatar
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    correct!!

    the bPr8es is used in many polaris engines. this is why it is important to run the correct recomended plug for each engine, and application.

    different motors have different head, and piston configurations.

    same deal, if you run a std BR8ES, where you are supposed to have a "projected" tip plug. the tip will be too far up in the head, and affect performance.

    this is not only in jest skis. this is true in your car, truck, lawnmower, weedeater, etc.

  8. #8

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    received mine................daym

  9. #9
    txgp1300r's Avatar
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    Quote Originally Posted by Pale Rider View Post
    from what I understand it is a Polaris plug...
    so that means its ok to put a polaris motor in my riding lawn tractor.

  10. #10
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by john zigler View Post
    this is why it is important to run the correct recomended plug for each engine, and application.
    The gap need to be correct too
    only one with set facorty gap has "-10" after the plug...bpr8es-10 is set to ten thousands,,,,,,,,,,,,,
    all others need to be checked and adjusted
    mattman

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