From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Date: Thu, 25 May 2023 19:45:24 -0500
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Subject: Re: [FlyRotary] Re: AR2592 gap
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On 5/25/2023 3:45 PM, Finn Lassen finn.lassen@verizon.net wrote:
> On 5/25/2023 2:58 PM, Charlie England ceengland7@gmail.com wrote:
>> On 5/25/2023 8:13 AM, Finn Lassen finn.lassen@verizon.net wrote:
>>> For those of you who use the AR2592 spark plug in the Renesis, do 
>>> you use the 0.6mm gap the plug comes with? I bought 8 of them some 
>>> years ago.
>>>
>>> I've been using the stock plugs (RE7A and RE9B) for maybe 100 hours 
>>> by now. Experienced a brief 200 RPM drop on last takeoff. Wondering 
>>> if it's time to change plugs. Or re-gap the stock plugs to what?
>>>
>>> What can I learn by looking at plugs?
>>>
>>> Best way to clean them?
>>>
>>> Finn
>> Since no one else is jumping in...
>>
>> I don't remember ever swapping plugs in either of the RX7s I used to 
>> own, but based on general info for IC engines, the general appearance 
>> of the 1st and 3rd look to me like they're running way too hot.  
>> Here's one site about 'reading' plugs:
>> https://www.lazerhelmets.com/lean-spark-plug-chart/
>>
>> At $5-$6 each, it's hard for me to justify cleaning/gapping an old 
>> worn plug, especially if it looks pretty rough.
>>
>> Charlie
>>
>
> Not sure I'm seeing the same thing as you in that chart. Actual plugs 
> are darker than in the picture.
>
> 1st and 3rd are the leading plugs. Wonder if the small hole for the 
> trailing plugs causes them to have less crud.
>
> Also that crud makes me wonder if I should mix less oil. Still using 
> about 1oz/gal. I think that Tracy mentioned using less for the 
> Renesis. But then he's using a 50/50 mixture of MMO and 2 stroke oil.
>
> I was going to replace them with the AR2592 but then got thinking 
> about correct gapping.
>
> Finn
Maybe it's hard for me to tell due to image resolution, but they look 
like the electrodes are eroded, and maybe even the insulator, too. Am I 
seeing deposits on the surface, instead of erosion?

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