From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: AR2592 gap
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-2071665@logan.com>
Message-ID: <3f3f1898-e0a0-593e-9d23-398f4741837f@verizon.net>
Date: Mon, 29 May 2023 00:23:00 -0400
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About 1-1/16". Just measure the OD of your socket.

On the lower holes (Leading) I used a round (ball) carbide bit. Maybe 1" 
diameter.
On the upper ones I put in a spark plug with the socket on it and traced 
the outline on the "eyebrow" and below.
I had an 1" OD flat-bottomed carbide "bit".
Used in electric drill motor. Alum is soft. Just went real slow speed. 
Not as difficult as I had anticipated.
I picked up those (used) carbide bits at an outside vendor at Sun'n'Fun 
decades ago. No clue where to get them now.

Obviously would get prettier result with rotor housings in a mill -- 
only an option with disassembled engine. I also considered a holesaw 
with a machined bushing in the hole as a guide, but not practical as 
don't have a lathe to make the bushing and a proper OD holesaw, although 
1-1/8" could work.

Finn

On 5/28/2023 10:28 PM, Stephen Izett stephen.izett@gmail.com wrote:
> Hi Finn
>
> Thanks for the information re plugs and gaps.
> How did you end up grinding the housings and how much did you remove?
> I’ve ground a few plug sockets down but they are so thin they break.
>
> Cheers
>
> Steve Izett
>
>> On 29 May 2023, at 10:11 am, Finn Lassen finn.lassen@verizon.net 
>> <flyrotary@lancaironline.net> wrote:
>>
>> Talked to Tracy.
>> He's looking for gap in the 0.03 to 0.035" range, but just installed 
>> BR10EIX which I think comes with 0.048" (approx) from manufacturer, I 
>> think. He just eyed the gaps in the new plugs and called it close enough.
>>
>> He also ran the stock RX-7 plugs in his Renesis until he ran out of 
>> his stock of them.
>>
>> So it doesn't seem all that critical.
>>
>> Alter grinding the rotor housings to make room for socket over the 
>> AR2502 plugs, I did a short flight (16 mins) today with the old 
>> cleaned trailing plugs and two new AR2592 plugs gapped to 0.030". 
>> Seems I gained at least 100 RPM on takeoff and climbout.
>>
>> BTW, measured gap on four AR2592 new plugs and it varied from 0.024 
>> to 0.030. Supposed to be 0.025" from manufacturer. Moral of story is 
>> you need to check/set gap on new plugs (where possible).
>>
>> Probably all common knowledge to you all but new data to me.
>>
>> Finn
>>
>>
>> On 5/25/2023 9:13 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
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Homepage:http://www.flyrotary.com/
>>> Archive and UnSub:http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>
>>
>


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    <div class="moz-cite-prefix">About 1-1/16". Just measure the OD of
      your socket.<br>
      <br>
      On the lower holes (Leading) I used a round (ball) carbide bit.
      Maybe 1" diameter.<br>
      On the upper ones I put in a spark plug with the socket on it and
      traced the outline on the "eyebrow" and below.<br>
      I had an 1" OD flat-bottomed carbide "bit".<br>
      Used in electric drill motor. Alum is soft. Just went real slow
      speed. Not as difficult as I had anticipated.<br>
      I picked up those (used) carbide bits at an outside vendor at
      Sun'n'Fun decades ago. No clue where to get them now.<br>
      <br>
      Obviously would get prettier result with rotor housings in a mill
      -- only an option with disassembled engine. I also considered a
      holesaw with a machined bushing in the hole as a guide, but not
      practical as don't have a lathe to make the bushing and a proper
      OD holesaw, although 1-1/8" could work.<br>
      <br>
      Finn <br>
      <br>
      On 5/28/2023 10:28 PM, Stephen Izett <a class="moz-txt-link-abbreviated" href="mailto:stephen.izett@gmail.com">stephen.izett@gmail.com</a>
      wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-2071665@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      Hi Finn
      <div><br>
      </div>
      <div>Thanks for the information re plugs and gaps.</div>
      <div>How did you end up grinding the housings and how much did you
        remove?</div>
      <div>I’ve ground a few plug sockets down but they are so thin they
        break.</div>
      <div><br>
      </div>
      <div>Cheers</div>
      <div><br>
      </div>
      <div>Steve Izett</div>
      <div>
        <div><br>
          <blockquote type="cite">
            <div>On 29 May 2023, at 10:11 am, Finn Lassen
              <a class="moz-txt-link-abbreviated" href="mailto:finn.lassen@verizon.net">finn.lassen@verizon.net</a>
              <a class="moz-txt-link-rfc2396E" href="mailto:flyrotary@lancaironline.net">&lt;flyrotary@lancaironline.net&gt;</a> wrote:</div>
            <br class="Apple-interchange-newline">
            <div>
              <meta http-equiv="Content-Type" content="text/html;
                charset=utf-8">
              <div text="#000000" bgcolor="#FFFFFF">
                <div class="moz-cite-prefix">Talked to Tracy.<br>
                  He's looking for gap in the 0.03 to 0.035" range, but
                  just installed BR10EIX which I think comes with 0.048"
                  (approx) from manufacturer, I think. He just eyed the
                  gaps in the new plugs and called it close enough.<br>
                  <br>
                  He also ran the stock RX-7 plugs in his Renesis until
                  he ran out of his stock of them.<br>
                  <br>
                  So it doesn't seem all that critical.<br>
                  <br>
                  Alter grinding the rotor housings to make room for
                  socket over the AR2502 plugs, I did a short flight (16
                  mins) today with the old cleaned trailing plugs and
                  two new AR2592 plugs gapped to 0.030". Seems I gained
                  at least 100 RPM on takeoff and climbout.<br>
                  <br>
                  BTW, measured gap on four AR2592 new plugs and it
                  varied from 0.024 to 0.030. Supposed to be 0.025" from
                  manufacturer. Moral of story is you need to check/set
                  gap on new plugs (where possible).<br>
                  <br>
                  Probably all common knowledge to you all but new data
                  to me.<br>
                  <br>
                  Finn<br>
                  <br>
                  <br>
                  On 5/25/2023 9:13 AM, Finn Lassen <a
                    class="moz-txt-link-abbreviated"
                    href="mailto:finn.lassen@verizon.net"
                    moz-do-not-send="true">finn.lassen@verizon.net</a>
                  wrote:<br>
                </div>
                <blockquote type="cite"
                  cite="mid:list-2061183@logan.com">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. <br>
                  <br>
                  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? <br>
                  <br>
                  What can I learn by looking at plugs? <br>
                  <br>
                  Best way to clean them? <br>
                  <br>
                  Finn <br>
                  <br>
                  <br>
                  <br>
                  <br>
                  <fieldset class="mimeAttachmentHeader"></fieldset>
                  <br>
                  <pre wrap="">--
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