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Everything resonates at it own natural frequency including us haha, and if =
your crank and flywheel are close in that particular freq you will have a p=
roblem so changing the weight will change the freq. subtracting weight does=
help but to what measure on your application I can't say, adding weight ma=
y help but it could also have the effect of compounding the problem. I am p=
artial to using a front pulley as light and small as possible (no damper) a=
nd also a huge fan of light weight flywheels and small diameter clutches fo=
r this very reason. The most expensive thing you can do to help your the pr=
oblem is a super light crankshaft. I recently build a motor for a guy with =
a custom crank that knocked off 12 lbs and I could tell the difference on t=
he dyno before it ever went in the car, the typical vibrations were gone. I=
asked the driver after his first session how he liked the motor and the on=
ly thing he kept saying was "it's so smooth" over and over, it audibly soun=
ded different on track as well, crazy. The really bad part is when the Harm=
onic frequency gets transferred to the valve train, then you will have a se=
rious disaster. 4 cylinders are known for this problem and some guys won't =
even run one on their Dyno and I personally have thrown more flywheels off =
on the Dyno than I would care to admit and this very problem has forced me =
to look at the options if for no other reason than to make my life easier. =
Not looking for work here but I would be willing to build a crank for anyon=
e wanting to take their stuff to the next level but it would cost about $30=
00.
Thanks, Rick
General (Mad Dog) Mattis"Be prepared to reverse decisions as new data comes=
in, then replace assumptions=C2=A0with knowledge"
=20
On Thursday, May 21, 2020, 03:43:54 PM EDT, TeriAnn J. Wakeman via Fot =
<fot@autox.team.net> wrote: =20
=20
=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
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
tt.net
=20
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<html><head></head><body><div class=3D"ydp6d160257yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px=
;"><div><div dir=3D"ltr" data-setdir=3D"false">Everything resonates at it o=
wn natural frequency including us haha, and if your crank and flywheel are =
close in that particular freq you will have a problem so changing the weigh=
t will change the freq. subtracting weight does help but to what measure on=
your application I can't say, adding weight may help but it could also hav=
e the effect of compounding the problem. I am partial to using a front pull=
ey as light and small as possible (no damper) and also a huge fan of light =
weight flywheels and small diameter clutches for this very reason. The most=
expensive thing you can do to help your the problem is a super light crank=
shaft. I recently build a motor for a guy with a custom crank that knocked =
off 12 lbs and I could tell the difference on the dyno before it ever went =
in the car, the typical vibrations were gone. I asked the driver after his =
first session how he liked the motor and the only thing he kept saying was =
"it's so smooth" over and over, it audibly sounded different on track as we=
ll, crazy. The really bad part is when the Harmonic frequency gets transfer=
red to the valve train, then you will have a serious disaster. 4 cylinders =
are known for this problem and some guys won't even run one on their Dyno a=
nd I personally have thrown more flywheels off on the Dyno than I would car=
e to admit and this very problem has forced me to look at the options if fo=
r no other reason than to make my life easier. Not looking for work here bu=
t I would be willing to build a crank for anyone wanting to take their stuf=
f to the next level but it would cost about $3000.</div><div><br></div><div=
dir=3D"ltr" data-setdir=3D"false">Thanks, Rick</div><div class=3D"ydp6d160=
257signature"><div style=3D"font-family:Helvetica, Arial, sans-serif;font-s=
ize:16px;"><div dir=3D"ltr"><br></div><div dir=3D"ltr">General (Mad Dog) Ma=
ttis</div><div dir=3D"ltr"><i>"Be prepared to reverse decisions as new data=
comes in, then replace assumptions </i><i>with knowledge"</i></div><d=
iv dir=3D"ltr"><br></div></div></div></div>
<div><br></div><div><br></div>
=20
</div><div id=3D"yahoo_quoted_0745080473" class=3D"yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Thursday, May 21, 2020, 03:43:54 PM EDT, TeriAnn J. =
Wakeman via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"yiv3792641841">
=20
=20
=20
<div>
<p><font size=3D"+1"><font face=3D"Adobe Garamond">Something I have
wondered about for years.</font></font></p>
<p><font size=3D"+1"><font face=3D"Adobe Garamond">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.</font></font></p>
<p><font size=3D"+1"><font face=3D"Adobe Garamond">TeriAnn<br>
</font></font></p>
</div>
</div>_______________________________________________<br><a ymailto=3D"mail=
to:fot@autox.team.net" href=3D"mailto:fot@autox.team.net";>fot@autox.team.ne=
t</a><br><br><a href=3D"http://www.fot-racing.com"; target=3D"_blank">http:/=
/www.fot-racing.com</a><br><br>Donate: <a href=3D"http://www.team.net/donat=
e.html" target=3D"_blank">http://www.team.net/donate.html</a><br>Archive: <=
a href=3D"http://autox.team.net/archive " target=3D"_blank">http://autox.te=
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a><br><br><br></div>
</div>
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_______________________________________________
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http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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