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Re: [Healeys] Lightened flywheels

from [Michael Oritt via Healeys] [Permanent Link][Original]
To: richard mayor <boyracer466@gmail.com>
Subject: Re: [Healeys] Lightened flywheels
From: Michael Oritt via Healeys <healeys@autox.team.net>
Date: Tue, 7 Sep 2021 19:40:33 -0400
Cc: healeys <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <CAKkXjqMWpoGgGceXCAZLp8r-yfPJbu8Y-k1FPK0Oag5g=vJPtw@mail.gmail.com> <000001d7a425$4709aa80$d51cff80$@shaw.ca> <CAB3i7LLYfW7Vf8fhCd418m-tjbCikc+pV2Tt5HNJZ0r0_3OFoQ@mail.gmail.com> <CAKkXjqMc_YfapH==Qdu4ULiryTyU1wjmXYoYXgp_eU2w4hGFBg@mail.gmail.com> 
--===============0913840111137170084==

--00000000000009a7df05cb704b00
Content-Transfer-Encoding: quoted-printable

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"  *the =
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-fa=
ilures/
>> Thirdly lightening a flywheel in of itself has very little effect on
>> acceleration.  An engine with a lightened flywheel may accelerate to 600=
0
>> 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 weig=
ht
>> 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 t=
o
>>> Kent Lambert, who took over Bills Healey business awhile back, the stoc=
k
>>> 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
>>> 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 poun=
d
>>> range. Very aggressive machine work can get the weight down to the 22-2=
3
>>> pound range.
>>>
>>> How much weight you take off will affect your driving style. To maintai=
n
>>> 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&u=
tm_campaign=3Dsig-email&utm_content=3Demailclient> Virus-free.
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--=20
Best--Michael

--00000000000009a7df05cb704b00
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D""><span style=3D"col=
or:rgb(51,51,255)">I hesitate to nitpick but as to the statement that </spa=
n><i style=3D""><font color=3D"#0000ff">&quot;4 to 5 pounds off vehicle wei=
ght 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 t=
ime I looked an AH fuel tank holds about 12 gallons and since gasoline weig=
hs approximately 7.5 lbs per gallon half a tank weighs about 45 pounds.=C2=
=A0=C2=A0</font><span style=3D"color:rgb(51,51,255)">The defense rests....<=
/span></div><div class=3D"gmail_default" style=3D""><font color=3D"#3333ff"=
><br></font></div><div class=3D"gmail_default" style=3D""><font color=3D"#3=
333ff">Best--Michael Oritt=C2=A0=C2=A0</font></div></div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Sep 7, 2021 at 6=
:00 PM richard mayor via Healeys &lt;<a href=3D"mailto:healeys@autox.team.n=
et">healeys@autox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><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"l=
tr" class=3D"gmail_attr">On Tue, Sep 7, 2021 at 2:24 PM Michael Salter &lt;=
<a href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank">michaelsalter@=
gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div dir=3D"auto">The total mass of the flywheel is not complete=
ly relevant insofar as engine moment of inertia is concerned.<div dir=3D"au=
to">What is important is the mass removed times the square of the radius, s=
o 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 b=
est thing to do, if it was you can be assured that manufacturers would be a=
ll over it as a way to save money.</div><div dir=3D"auto">The rotational ma=
ss is often designed in to protect the drive train, in particular the gearb=
ox.</div><div dir=3D"auto">Read this:=C2=A0 <a href=3D"https://www.netbug.n=
et/blogmichael/2017/01/03/austin-healey-100-crank-failures/" target=3D"_bla=
nk">https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-f=
ailures/</a></div><div dir=3D"auto">Thirdly lightening a flywheel in of its=
elf has very little effect on acceleration.=C2=A0 An engine with a lightene=
d flywheel may accelerate to 6000 RPM 1 - 2 seconds more quickly but that d=
oesn&#39;t necessarily equate to 1-2 seconds faster to 60 MPH. You may be a=
ble 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).</div><div dir=3D"auto"><br></div><div dir=3D"au=
to">Just sayin&#39;</div><div dir=3D"auto"><br></div><div dir=3D"auto">M</d=
iv></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_att=
r">On Tue., Sep. 7, 2021, 4:17 p.m. Earl Kagna via Healeys, &lt;<a href=3D"=
mailto:healeys@autox.team.net"; rel=3D"noreferrer" target=3D"_blank">healeys=
@autox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex"><div lang=3D"EN-US"><div><p class=3D"MsoNormal">I have Bill =
Bolton lightened flywheels in both my Healeys.=C2=A0 According to Kent Lamb=
ert, who took over Bills Healey business awhile back, the stock weight (6 c=
yl) 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"MsoNor=
mal">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></p><p class=3D"MsoN=
ormal"><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"MsoN=
ormal">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"Ms=
oNormal"><u></u>=C2=A0<u></u></p><div style=3D"border-color:rgb(225,225,225=
) currentcolor currentcolor;border-style:solid none none;border-width:1pt m=
edium medium;padding:3pt 0in 0in"><p class=3D"MsoNormal"><b>From:</b> Heale=
ys &lt;<a href=3D"mailto:healeys-bounces@autox.team.net"; rel=3D"noreferrer =
noreferrer" target=3D"_blank">healeys-bounces@autox.team.net</a>&gt; <b>On =
Behalf Of </b>richard mayor<br><b>Sent:</b> Tuesday, September 7, 2021 10:2=
3 AM<br><b>To:</b> healeys &lt;<a href=3D"mailto:healeys@autox.team.net"; re=
l=3D"noreferrer noreferrer" target=3D"_blank">healeys@autox.team.net</a>&gt=
;<br><b>Subject:</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"MsoNorm=
al">6 cylinder flywheels vary slightly but are all generally in the 29 poun=
d range. Very aggressive machine work can get the weight down to the 22-23 =
pound range. <u></u><u></u></p></div><div><p class=3D"MsoNormal">How much w=
eight you take off will affect your driving style. To maintain the feel of =
a stock Healey while still improving the engines response, I suggest removi=
ng no more than 3 pounds. <u></u><u></u></p></div><div><p class=3D"MsoNorma=
l"><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_-737649955836823603=
5gmail-m_-5451347567706541358m_4102748135953362380m_-1299543942381278781DAB=
4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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v>

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