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The total mass of the flywheel is not completely relevant insofar as engine
moment of inertia is concerned.
What is important is the mass removed times the square of the radius, so
just how much weight has been removed per se is not important.
Secondly removing rotational inertia is not always the best thing to do, if
it was you can be assured that manufacturers would be all over it as a way
to save money.
The rotational mass is often designed in to protect the drive train, in
particular the gearbox.
Read this:
https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-failu=
res/
Thirdly lightening a flywheel in of itself has very little effect on
acceleration. An engine with a lightened flywheel may accelerate to 6000
RPM 1 - 2 seconds more quickly but that doesn't necessarily equate to 1-2
seconds faster to 60 MPH. You may be able to shift marginally faster if the
gearbox can stand the extra loads and the 4 to 5 pounds off vehicle weight
is really only the equivalent of half a tank of fuel. (Who ever notices
that their car accelerates more quickly with a half full gas tank).
Just sayin'
M
On Tue., Sep. 7, 2021, 4:17 p.m. Earl Kagna via Healeys, <
healeys@autox.team.net> wrote:
> I have Bill Bolton lightened flywheels in both my Healeys. According to
> Kent Lambert, who took over Bills Healey business awhile back, the stock
> weight (6 cyl) is 28.5 pounds, and Bills machining program reduced them t=
o
> 24.
>
>
>
> Both of my cars run just fine, no problems at all in the 20 + or so years
> that I=E2=80=99ve had them installed.
>
>
>
> Earl Kagna
>
> Victoria BC
>
> BJ8, BT7 tri-carb
>
>
>
>
>
>
>
> *From:* Healeys <healeys-bounces@autox.team.net> *On Behalf Of *richard
> mayor
> *Sent:* Tuesday, September 7, 2021 10:23 AM
> *To:* healeys <healeys@autox.team.net>
> *Subject:* [Healeys] Lightened flywheels
>
>
>
> 6 cylinder flywheels vary slightly but are all generally in the 29 pound
> range. Very aggressive machine work can get the weight down to the 22-23
> pound range.
>
> How much weight you take off will affect your driving style. To maintain
> the feel of a stock Healey while still improving the engines response, I
> suggest removing no more than 3 pounds.
>
>
>
> Richard
>
>
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<div dir=3D"auto">The total mass of the flywheel is not completely relevant=
insofar as engine moment of inertia is concerned.<div dir=3D"auto">What is=
important is the mass removed times the square of the radius, so just how =
much weight has been removed per se is not important.=C2=A0</div><div dir=
=3D"auto">Secondly removing rotational inertia is not always the best thing=
to do, if it was you can be assured that manufacturers would be all over i=
t as a way to save money.</div><div dir=3D"auto">The rotational mass is oft=
en designed in to protect the drive train, in particular the gearbox.</div>=
<div dir=3D"auto">Read this:=C2=A0 <a href=3D"https://www.netbug.net/blogmi=
chael/2017/01/03/austin-healey-100-crank-failures/">https://www.netbug.net/=
blogmichael/2017/01/03/austin-healey-100-crank-failures/</a></div><div dir=
=3D"auto">Thirdly lightening a flywheel in of itself has very little effect=
on acceleration.=C2=A0 An engine with a lightened flywheel may accelerate =
to 6000 RPM 1 - 2 seconds more quickly but that doesn't necessarily equ=
ate to 1-2 seconds faster to 60 MPH. You may be able to shift marginally fa=
ster if the gearbox can stand the extra loads and the 4 to 5 pounds off veh=
icle weight is really only the equivalent of half a tank of fuel. (Who ever=
notices that their car accelerates more quickly with a half full gas tank)=
.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Just sayin'</div><=
div dir=3D"auto"><br></div><div dir=3D"auto">M</div></div><br><div class=3D=
"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue., Sep. 7, 2021, =
4:17 p.m. Earl Kagna via Healeys, <<a href=3D"mailto:healeys@autox.team.=
net" target=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a>> wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"#0=
563C1" vlink=3D"#954F72" style=3D"word-wrap:break-word"><div><p class=3D"Ms=
oNormal">I have Bill Bolton lightened flywheels in both my Healeys.=C2=A0 A=
ccording to Kent Lambert, who took over Bills Healey business awhile back, =
the stock weight (6 cyl) is 28.5 pounds, and Bills machining program reduce=
d them to 24.<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u><=
/p><p class=3D"MsoNormal">Both of my cars run just fine, no problems at all=
in the 20 + or so years that I=E2=80=99ve had them installed.<u></u><u></u=
></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">=
Earl Kagna<u></u><u></u></p><p class=3D"MsoNormal">Victoria BC<u></u><u></u=
></p><p class=3D"MsoNormal">BJ8, BT7 tri-carb<u></u><u></u></p><p class=3D"=
MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u><=
/u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div style=3D"border:=
none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class=3D"=
MsoNormal"><b>From:</b> Healeys <<a href=3D"mailto:healeys-bounces@autox=
.team.net" rel=3D"noreferrer noreferrer" target=3D"_blank">healeys-bounces@=
autox.team.net</a>> <b>On Behalf Of </b>richard mayor<br><b>Sent:</b> Tu=
esday, September 7, 2021 10:23 AM<br><b>To:</b> healeys <<a href=3D"mail=
to:healeys@autox.team.net" rel=3D"noreferrer noreferrer" target=3D"_blank">=
healeys@autox.team.net</a>><br><b>Subject:</b> [Healeys] Lightened flywh=
eels<u></u><u></u></p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>=
<div><div><p class=3D"MsoNormal">6 cylinder flywheels vary slightly but are=
all generally in the 29 pound range. Very aggressive machine work can get =
the weight down to the 22-23 pound range. <u></u><u></u></p></div><div><p c=
lass=3D"MsoNormal">How much weight you take off will affect your driving st=
yle. To maintain the feel of a stock Healey while still improving the engin=
es response, I suggest removing no more than 3 pounds. <u></u><u></u></p></=
div><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=
=3D"MsoNormal">Richard =C2=A0 <u></u><u></u></p></div></div></div><div id=
=3D"m_4102748135953362380m_-1299543942381278781DAB4FAD8-2DD7-40BB-A1B8-4E2A=
A1F9FDF2"><br>
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