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On my street TR4A, the harmonics came in about 2800 RPM and again at 5600 RP=
M.
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: 319.464.4711
> On May 21, 2020, at 6:14 PM, timmmurphh--- via Fot <fot@autox.team.net> wr=
ote:
>=20
> =EF=BB=BF
> =20
> =20
> From: timmmurphh@gmail.com <timmmurphh@gmail.com>=20
> Sent: Thursday, May 21, 2020 6:06 PM
> To: 'TeriAnn J. Wakeman' <tjwakeman@gmail.com>
> Subject: RE: [Fot] Flywheel wt & crank harmonics -TR3/4
> =20
> The weight of the flywheel will definitely affect the harmonic frequency. =
The heavier the flywheel, the lower the harmonic frequency will be. The fl=
ywheel 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.
> =20
> An RPM of 5200 was mentioned as the harmonic resonance. I had always hear=
d that it was more like 6300 RPM. I have never seen a calculation for it. I=
t would be complex. Note that lighter pistons and connecting rods would ten=
d to lower the harmonic frequency as they would reduce the inertia in the en=
gine.
> =20
> Tim Murphy
> =20
> From: Fot <fot-bounces@autox.team.net> On Behalf Of TeriAnn J. Wakeman via=
Fot
> Sent: Thursday, May 21, 2020 2:44 PM
> To: FOT <fot@autox.team.net>
> Subject: [Fot] Flywheel wt & crank harmonics -TR3/4
> =20
> Something I have wondered about for years.
>=20
> Does the weight of the flywheel affect the RPM and intensity of harmonics i=
nherent in a TR3/4 stock crank? I've never found an answer to that question.=
>=20
> TeriAnn
>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/joealexander=
vintage@gmail.com
>=20
>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">On my street TR4A, the harmonics came in ab=
out 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=3D"ltr">Joe Alexander<div>4505 Don=
ald Dr</div><div>Cedar Falls, IA 50613</div><div>The-vintage-racer.com</div>=
<div>Gasketinnovations.com</div><div>Cell: 319.464.4711</div><div><br>=
</div></div><div dir=3D"ltr"><br><blockquote type=3D"cite">On May 21, 2020, a=
t 6:14 PM, timmmurphh--- via Fot <fot@autox.team.net> wrote:<br><br></=
blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<meta h=
ttp-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8"><meta name=
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</o:shapelayout></xml><![endif]--><div class=3D"WordSection1"><p class=3D"Ms=
oNormal"><o:p> </o:p></p><p class=3D"MsoNormal"><o:p> </o:p></p><d=
iv><div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0i=
n 0in 0in"><p class=3D"MsoNormal"><b>From:</b> timmmurphh@gmail.com <timm=
murphh@gmail.com> <br><b>Sent:</b> Thursday, May 21, 2020 6:06 PM<br><b>T=
o:</b> 'TeriAnn J. Wakeman' <tjwakeman@gmail.com><br><b>Subject:</b> R=
E: [Fot] Flywheel wt & crank harmonics -TR3/4<o:p></o:p></p></div></div>=
<p class=3D"MsoNormal"><o:p> </o:p></p><p class=3D"MsoNormal">The weigh=
t of the flywheel will definitely affect the harmonic frequency. The h=
eavier the flywheel, the lower the harmonic frequency will be. The fly=
wheel contributes a significant amount to the total rotating inertia due to i=
ts weight and that the weight is at greater radius than the other rotating m=
asses. Inertia increases as the square of the radius. It is not a=
linear function of the radius.<o:p></o:p></p><p class=3D"MsoNormal"><o:p>&n=
bsp;</o:p></p><p class=3D"MsoNormal">An RPM of 5200 was mentioned as the har=
monic resonance. I had always heard that it was more like 6300 RPM.&nb=
sp; I have never seen a calculation for it. It would be complex. =
Note that lighter pistons and connecting rods would tend to lower the harmo=
nic frequency as they would reduce the inertia in the engine.<o:p></o:p></p>=
<p class=3D"MsoNormal"><o:p> </o:p></p><p class=3D"MsoNormal">Tim Murph=
y<o:p></o:p></p><p class=3D"MsoNormal"><o:p> </o:p></p><div><div style=3D=
"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in"><p cl=
ass=3D"MsoNormal"><b>From:</b> Fot <<a href=3D"mailto:fot-bounces@autox.t=
eam.net">fot-bounces@autox.team.net</a>> <b>On Behalf Of </b>TeriAnn J. W=
akeman via Fot<br><b>Sent:</b> Thursday, May 21, 2020 2:44 PM<br><b>To:</b> =
FOT <<a href=3D"mailto:fot@autox.team.net";>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=3D"MsoNormal"><o:p> </o:p></p><p><span style=3D"f=
ont-size:13.5pt;font-family:"Adobe Garamond",serif">Something I ha=
ve wondered about for years.</span><o:p></o:p></p><p><span style=3D"font-siz=
e:13.5pt;font-family:"Adobe Garamond",serif">Does the weight of th=
e flywheel affect the RPM and intensity of harmonics inherent in a TR3/4 sto=
ck crank? I've never found an answer to that question.</span><o:p></o:p></p>=
<p><span style=3D"font-size:13.5pt;font-family:"Adobe Garamond",se=
rif">TeriAnn</span><o:p></o:p></p></div><span>______________________________=
_________________</span><br><span>fot@autox.team.net</span><br><span></span>=
<br><span>http://www.fot-racing.com</span><br><span></span><br><span>Donate:=
http://www.team.net/donate.html</span><br><span>Archive: http://autox.team.=
net/archive http://www.team.net/pipermail/fot</span><br><span>Unsubscribe/Ma=
nage: http://autox.team.net/mailman/options/fot/joealexandervintage@gmail.co=
m</span><br><span></span><br><span></span><br></div></blockquote></div></bod=
y></html>=
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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