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Michael,
Comparing the weight of fuel in the gas tank to rotational mass is like
comparing apples to bananas.
Richard
On Tue, Sep 7, 2021 at 2:24 PM Michael Salter <michaelsalter@gmail.com>
wrote:
> 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-fai=
lures/
> 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 t=
he
> gearbox can stand the extra loads and the 4 to 5 pounds off vehicle weigh=
t
> 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 =
to
>> 24.
>>
>>
>>
>> Both of my cars run just fine, no problems at all in the 20 + or so year=
s
>> 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"ltr"><div>Michael, <br></div><div><br></div><div>Comparing the =
weight of fuel in the gas tank to rotational mass is like comparing apples =
to bananas. <br></div><div><br></div><div>Richard<br></div><div><br></div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">O=
n Tue, Sep 7, 2021 at 2:24 PM Michael Salter <<a href=3D"mailto:michaels=
alter@gmail.com">michaelsalter@gmail.com</a>> wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">The total mass of=
the flywheel is not completely relevant insofar as engine moment of inerti=
a is concerned.<div dir=3D"auto">What is important is the mass removed time=
s 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 rotationa=
l 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.</div><div d=
ir=3D"auto">The rotational mass is often designed in to protect the drive t=
rain, in particular the gearbox.</div><div dir=3D"auto">Read this:=C2=A0 <a=
href=3D"https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-cr=
ank-failures/" target=3D"_blank">https://www.netbug.net/blogmichael/2017/01=
/03/austin-healey-100-crank-failures/</a></div><div dir=3D"auto">Thirdly li=
ghtening 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 se=
conds more quickly but that doesn't necessarily equate to 1-2 seconds f=
aster 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 reall=
y 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"a=
uto"><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 d=
ir=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"; rel=3D"noreferr=
er" target=3D"_blank">healeys@autox.team.net</a>> wrote:<br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1=
px solid rgb(204,204,204);padding-left:1ex"><div style=3D"overflow-wrap: br=
eak-word;" lang=3D"EN-US"><div><p class=3D"MsoNormal">I have Bill Bolton li=
ghtened flywheels in both my Healeys.=C2=A0 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 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">BJ=
8, 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-color:rgb(225,225,225) current=
color currentcolor;border-style:solid none none;border-width:1pt medium med=
ium;padding:3pt 0in 0in"><p class=3D"MsoNormal"><b>From:</b> Healeys <<a=
href=3D"mailto:healeys-bounces@autox.team.net"; rel=3D"noreferrer noreferre=
r" target=3D"_blank">healeys-bounces@autox.team.net</a>> <b>On Behalf Of=
</b>richard mayor<br><b>Sent:</b> Tuesday, September 7, 2021 10:23 AM<br><=
b>To:</b> healeys <<a href=3D"mailto:healeys@autox.team.net"; rel=3D"nore=
ferrer noreferrer" target=3D"_blank">healeys@autox.team.net</a>><br><b>S=
ubject:</b> [Healeys] Lightened flywheels<u></u><u></u></p></div><p class=
=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNormal">6 c=
ylinder 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 r=
ange. <u></u><u></u></p></div><div><p class=3D"MsoNormal">How much weight y=
ou 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 m=
ore 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"gmail-m_-5451347567706541358m_4102=
748135953362380m_-1299543942381278781DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2">=
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