Re: [Healeys] Lightened flywheels

[Michael Oritt <michael.oritt@gmail.com>]

--===============1341357524478199479==

--00000000000060b33305cb711e07
Content-Transfer-Encoding: quoted-printable

Keith--

Right you are (and wrong I am) but 6 x 6.3=3D20+/-which is still more than
5...

Best--Michael Oritt



On Tue, Sep 7, 2021 at 7:53 PM llennep--- via Healeys <
healeys@autox.team.net> wrote:

> Nitpicking me here . . ..  .. .
> gallon of gasoline weighs a tad over 6 lbs
> :)
>
>
> -----Original Message-----
> From: Michael Oritt via Healeys <healeys@autox.team.net>
> To: richard mayor <boyracer466@gmail.com>
> Cc: healeys <healeys@autox.team.net>
> Sent: Tue, Sep 7, 2021 7:40 pm
> Subject: Re: [Healeys] Lightened flywheels
>
> I hesitate to nitpick but as to the statement that *"4 to 5 pounds off
> vehicle weight is really only the equivalent of half a tank of fuel"  *th=
e
> last time I looked an AH fuel tank holds about 12 gallons and since
> gasoline weighs approximately 7.5 lbs per gallon half a tank weighs about
> 45 pounds.  The defense rests....
>
> Best--Michael Oritt
>
> On Tue, Sep 7, 2021 at 6:00 PM richard mayor via Healeys <
> healeys@autox.team.net> wrote:
>
> 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 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
>
>
> <https://www.avast.com/sig-email?utm_medium=3Demail&utm_source=3Dlink&utm=
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> --
> Best--Michael
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--=20
Best--Michael

--00000000000060b33305cb711e07
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Keith=
--</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div=
 class=3D"gmail_default" style=3D"color:#3333ff">Right you are (and wrong I=
 am) but 6 x 6.3=3D20+/-which is still more than 5...</div><div class=3D"gm=
ail_default" style=3D"color:#3333ff"><br></div><div class=3D"gmail_default"=
 style=3D"color:#3333ff">Best--Michael Oritt</div><div class=3D"gmail_defau=
lt" style=3D"color:#3333ff"><br></div><div class=3D"gmail_default" style=3D=
"color:#3333ff"><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"=
ltr" class=3D"gmail_attr">On Tue, Sep 7, 2021 at 7:53 PM llennep--- via Hea=
leys &lt;<a href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</=
a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">Nitpicking =
me here . . .. =C2=A0.. .
<div>gallon of gasoline weighs a tad over 6 lbs</div>

<div>:)<br>
<br>
<br>

<div style=3D"font-family:helvetica,arial;font-size:10pt;color:black"><font=
 size=3D"2">-----Original Message-----<br>
From: Michael Oritt via Healeys &lt;<a href=3D"mailto:healeys@autox.team.ne=
t" target=3D"_blank">healeys@autox.team.net</a>&gt;<br>
To: richard mayor &lt;<a href=3D"mailto:boyracer466@gmail.com"; target=3D"_b=
lank">boyracer466@gmail.com</a>&gt;<br>
Cc: healeys &lt;<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank"=
>healeys@autox.team.net</a>&gt;<br>
Sent: Tue, Sep 7, 2021 7:40 pm<br>
Subject: Re: [Healeys] Lightened flywheels<br>
<br>

<div id=3D"gmail-m_-6446079295951788294yiv1063698908">
<div>
<div dir=3D"ltr">
<div><span style=3D"color:rgb(51,51,255)">I hesitate to nitpick but as to t=
he statement that </span><i><font color=3D"#0000ff">&quot;4 to 5 pounds off=
 vehicle weight is really only the equivalent of half a tank of fuel&quot;=
=C2=A0</font>=C2=A0</i><font color=3D"#0000ff">the l</font><font color=3D"#=
3333ff">ast time I looked an AH fuel tank holds about 12 gallons and since =
gasoline weighs approximately 7.5 lbs per gallon half a tank weighs about 4=
5 pounds.=C2=A0=C2=A0</font><span style=3D"color:rgb(51,51,255)">The defens=
e rests....</span></div>

<div><font color=3D"#3333ff"><br clear=3D"none"></font></div>

<div><font color=3D"#3333ff">Best--Michael Oritt=C2=A0=C2=A0</font></div>
</div>
<br clear=3D"none">
<div>
<div id=3D"gmail-m_-6446079295951788294yiv1063698908yqtfd54840">
<div dir=3D"ltr">On Tue, Sep 7, 2021 at 6:00 PM richard mayor via Healeys &=
lt;<a shape=3D"rect" href=3D"mailto:healeys@autox.team.net"; rel=3D"noreferr=
er noopener" target=3D"_blank">healeys@autox.team.net</a>&gt; wrote:<br cle=
ar=3D"none"></div>
</div>
<blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">
<div id=3D"gmail-m_-6446079295951788294yiv1063698908yqtfd20741">
<div dir=3D"ltr">
<div>Michael, <br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div>Comparing the weight of fuel in the gas tank to rotational mass is lik=
e comparing apples to bananas. <br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div>Richard<br clear=3D"none"></div>

<div><br clear=3D"none"></div>
</div>
<br clear=3D"none">
<div>
<div dir=3D"ltr">On Tue, Sep 7, 2021 at 2:24 PM Michael Salter &lt;<a shape=
=3D"rect" href=3D"mailto:michaelsalter@gmail.com"; rel=3D"noreferrer noopene=
r" target=3D"_blank">michaelsalter@gmail.com</a>&gt; wrote:<br clear=3D"non=
e"></div>
<blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">
<div>The total mass of the flywheel is not completely relevant insofar as e=
ngine moment of inertia is concerned.
<div>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</di=
v>

<div>Secondly removing rotational inertia is not always the best thing to d=
o, if it was you can be assured that manufacturers would be all over it as =
a way to save money.</div>

<div>The rotational mass is often designed in to protect the drive train, i=
n particular the gearbox.</div>

<div>Read this:=C2=A0 <a shape=3D"rect" href=3D"https://www.netbug.net/blog=
michael/2017/01/03/austin-healey-100-crank-failures/" rel=3D"noreferrer noo=
pener" target=3D"_blank">https://www.netbug.net/blogmichael/2017/01/03/aust=
in-healey-100-crank-failures/</a></div>

<div>Thirdly lightening a flywheel in of itself has very little effect on a=
cceleration.=C2=A0 An engine with a lightened flywheel may accelerate to 60=
00 RPM 1 - 2 seconds more quickly but that doesn&#39;t necessarily equate t=
o 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 noti=
ces that their car accelerates more quickly with a half full gas tank).</di=
v>

<div><br clear=3D"none"></div>

<div>Just sayin&#39;</div>

<div><br clear=3D"none"></div>

<div>M</div>
</div>
<br clear=3D"none">
<div>
<div dir=3D"ltr">On Tue., Sep. 7, 2021, 4:17 p.m. Earl Kagna via Healeys, &=
lt;<a shape=3D"rect" href=3D"mailto:healeys@autox.team.net"; rel=3D"noreferr=
er noopener" target=3D"_blank">healeys@autox.team.net</a>&gt; wrote:<br cle=
ar=3D"none"></div>
<blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">
<div lang=3D"EN-US">
<div>
<div>I have Bill Bolton lightened flywheels in both my Healeys.=C2=A0 Accor=
ding 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 th=
em to 24.<u></u><u></u></div>

<div><u></u>=C2=A0<u></u></div>

<div>Both of my cars run just fine, no problems at all in the 20 + or so ye=
ars that I=E2=80=99ve had them installed.<u></u><u></u></div>

<div><u></u>=C2=A0<u></u></div>

<div>Earl Kagna<u></u><u></u></div>

<div>Victoria BC<u></u><u></u></div>

<div>BJ8, BT7 tri-carb<u></u><u></u></div>

<div><u></u>=C2=A0<u></u></div>

<div><u></u>=C2=A0<u></u></div>

<div><u></u>=C2=A0<u></u></div>

<div style=3D"border-color:rgb(225,225,225) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<div><b>From:</b> Healeys &lt;<a shape=3D"rect" href=3D"mailto:healeys-boun=
ces@autox.team.net" rel=3D"noreferrer noopener" target=3D"_blank">healeys-b=
ounces@autox.team.net</a>&gt; <b>On Behalf Of </b>richard mayor<br clear=3D=
"none"><b>Sent:</b> Tuesday, September 7, 2021 10:23 AM<br clear=3D"none"><=
b>To:</b> healeys &lt;<a shape=3D"rect" href=3D"mailto:healeys@autox.team.n=
et" rel=3D"noreferrer noopener" target=3D"_blank">healeys@autox.team.net</a=
>&gt;<br clear=3D"none"><b>Subject:</b> [Healeys] Lightened flywheels<u></u=
><u></u></div>
</div>

<div><u></u>=C2=A0<u></u></div>

<div>
<div>
<div>6 cylinder flywheels vary slightly but are all generally in the 29 pou=
nd range. Very aggressive machine work can get the weight down to the 22-23=
 pound range. <u></u><u></u></div>
</div>

<div>
<div>How much weight you take off will affect your driving style. To mainta=
in the feel of a stock Healey while still improving the engines response, I=
 suggest removing no more than 3 pounds. <u></u><u></u></div>
</div>

<div>
<div><u></u>=C2=A0<u></u></div>
</div>

<div>
<div>Richard =C2=A0 <u></u><u></u></div>
</div>
</div>
</div>

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-- <br clear=3D"none">
<div dir=3D"ltr"><font color=3D"#3333ff">Best--Michael</font></div>

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r" target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/michael.oritt@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://auto=
x.team.net/mailman/options/healeys/michael.oritt@gmail.com</a><br>
<br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><font color=3D"#3333ff">Best--Michael</font></di=
v>

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