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I noticed it on track at 5600 rpm because it foamed the fuel in the
float bowl, not because I actually felt it.
- Tony
On 5/21/2020 8:56 PM, Joe Alexander via Fot wrote:
> On my street TR4A, the harmonics came in about 2800 RPM and again at
> 5600 RPM.
>
> It was an interesting sensation. Hard to describe.
>
> I never noticed it in any of the race engines.
>
> Joe Alexander
> 4505 Donald Dr
> Cedar Falls, IA 50613
> The-vintage-racer.com
> Gasketinnovations.com
> Cell: Â 319.464.4711
>
>
>> On May 21, 2020, at 6:14 PM, timmmurphh--- via Fot
>> <fot@autox.team.net> wrote:
>>
>> 
>>
>> *From:* timmmurphh@gmail.com <timmmurphh@gmail.com>
>> *Sent:* Thursday, May 21, 2020 6:06 PM
>> *To:* 'TeriAnn J. Wakeman' <tjwakeman@gmail.com>
>> *Subject:* RE: [Fot] Flywheel wt & crank harmonics -TR3/4
>>
>> The weight of the flywheel will definitely affect the harmonic
>> frequency. The heavier the flywheel, the lower the harmonic
>> frequency will be. The flywheel contributes a significant amount to
>> the total rotating inertia due to its weight and that the weight is
>> at greater radius than the other rotating masses. Inertia increases
>> as the square of the radius. It is not a linear function of the radius.
>>
>> An RPM of 5200 was mentioned as the harmonic resonance. I had always
>> heard that it was more like 6300 RPM. I have never seen a
>> calculation for it. It would be complex. Note that lighter pistons
>> and connecting rods would tend to lower the harmonic frequency as
>> they would reduce the inertia in the engine.
>>
>> Tim Murphy
>>
>> *From:* Fot <fot-bounces@autox.team.net
>> Wakeman via Fot
>> *Sent:* Thursday, May 21, 2020 2:44 PM
>> *Subject:* [Fot] Flywheel wt & crank harmonics -TR3/4
>>
>> Something I have wondered about for years.
>>
>> Does the weight of the flywheel affect the RPM and intensity of
>> harmonics inherent in a TR3/4 stock crank? I've never found an answer
>> to that question.
>>
>> TeriAnn
>>
>> _______________________________________________
>> fot@autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
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>>
>>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
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<p>I noticed it on track at 5600 rpm because it foamed the fuel in
the float bowl, not because I actually felt it.</p>
<p>- Tony<br>
</p>
<div class="moz-cite-prefix">On 5/21/2020 8:56 PM, Joe Alexander via
Fot wrote:<br>
</div>
<blockquote type="cite"
cite="mid:603426AD-D1BF-4A2A-AA7B-78B20E2F7B18@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
On my street TR4A, the harmonics came in about 2800 RPM and again
at 5600 RPM.
<div><br>
</div>
<div>It was an interesting sensation. Hard to describe.</div>
<div><br>
</div>
<div>I never noticed it in any of the race engines.<br>
<br>
<div dir="ltr">Joe Alexander
<div>4505 Donald Dr</div>
<div>Cedar Falls, IA 50613</div>
<div>The-vintage-racer.com</div>
<div>Gasketinnovations.com</div>
<div>Cell: Â 319.464.4711</div>
<div><br>
</div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On May 21, 2020, at 6:14 PM,
timmmurphh--- via Fot <a class="moz-txt-link-rfc2396E"
href="mailto:fot@autox.team.net";><fot@autox.team.net></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
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medium)">
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<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> <a
class="moz-txt-link-abbreviated"
href="mailto:timmmurphh@gmail.com";>timmmurphh@gmail.com</a>
<a class="moz-txt-link-rfc2396E"
href="mailto:timmmurphh@gmail.com";><timmmurphh@gmail.com></a> <br>
<b>Sent:</b> Thursday, May 21, 2020 6:06 PM<br>
<b>To:</b> 'TeriAnn J. Wakeman'
<a class="moz-txt-link-rfc2396E"
href="mailto:tjwakeman@gmail.com";><tjwakeman@gmail.com></a><br>
<b>Subject:</b> RE: [Fot] Flywheel wt & crank
harmonics -TR3/4<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">The weight of the flywheel will
definitely affect the harmonic frequency. The heavier
the flywheel, the lower the harmonic frequency will be.Â
The flywheel contributes a significant amount to the
total rotating inertia due to its weight and that the
weight is at greater radius than the other rotating
masses. Inertia increases as the square of the radius.Â
It is not a linear function of the radius.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">An RPM of 5200 was mentioned as the
harmonic resonance. I had always heard that it was more
like 6300 RPM. I have never seen a calculation for it.Â
It would be complex. Note that lighter pistons and
connecting rods would tend to lower the harmonic
frequency as they would reduce the inertia in the
engine.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Tim Murphy<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Fot <<a
href="mailto:fot-bounces@autox.team.net";
moz-do-not-send="true">fot-bounces@autox.team.net</a>>
<b>On Behalf Of </b>TeriAnn J. Wakeman via Fot<br>
<b>Sent:</b> Thursday, May 21, 2020 2:44 PM<br>
<b>To:</b> FOT <<a
href="mailto:fot@autox.team.net";
moz-do-not-send="true">fot@autox.team.net</a>><br>
<b>Subject:</b> [Fot] Flywheel wt & crank
harmonics -TR3/4<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p><span style="font-size:13.5pt;font-family:"Adobe
Garamond",serif">Something I have wondered about
for years.</span><o:p></o:p></p>
<p><span style="font-size:13.5pt;font-family:"Adobe
Garamond",serif">Does the weight of the flywheel
affect the RPM and intensity of harmonics inherent in
a TR3/4 stock crank? I've never found an answer to
that question.</span><o:p></o:p></p>
<p><span style="font-size:13.5pt;font-family:"Adobe
Garamond",serif">TeriAnn</span><o:p></o:p></p>
</div>
<span>_______________________________________________</span><br>
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<pre class="moz-quote-pre"
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