From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Hot vs cold spark plugs
Message-ID: <f35ecdc3-6bde-7753-5e0a-d96559e41061@verizon.net>
Date: Fri, 26 May 2023 10:22:06 -0400
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Again I'll display my ignorance.

According to this chard from Summit

NGK Iridium IX Spark Plugs BR10EIX

a higher number from NGK means the plug will run colder.

Why is the stock leading plug (RE7A) designed to run hotter than the 
trailing (RE9B)? The trailing plugs are "protected" by a small hole to 
the combustion chamber so would expect them to see cooler temps.

Finn


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    <p>Again I'll display my ignorance.</p>
    <p>According to this chard from Summit</p>
    <p><img id="primaryImage" data-open="MediaModal" alt="NGK Iridium IX
        Spark Plugs BR10EIX"
src="https://static.summitracing.com/global/images/prod/xlarge/ngk-1006_xl.jpg"
        data-ismainimagerepresentative="false" tabindex="0"></p>
    <p>a higher number from NGK means the plug will run colder.</p>
    <p>Why is the stock leading plug (RE7A) designed to run hotter than
      the trailing (RE9B)? The trailing plugs are "protected" by a small
      hole to the combustion chamber so would expect them to see cooler
      temps.</p>
    <p>Finn<br>
    </p>
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