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Nitpicking me here . . .. =C2=A0.. .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 vehic=
le weight is really only the equivalent of half a tank of fuel"=C2=A0=C2=A0=
the last time I looked an AH fuel tank holds about 12 gallons and since gas=
oline weighs approximately 7.5 lbs per gallon half a tank weighs about 45 p=
ounds.=C2=A0=C2=A0The defense rests....
Best--Michael Oritt=C2=A0=C2=A0
On Tue, Sep 7, 2021 at 6:00 PM richard mayor via Healeys <healeys@autox.tea=
m.net> wrote:
Michael,=20
Comparing the weight of fuel in the gas tank to rotational mass is like com=
paring apples to bananas.=20
Richard
On Tue, Sep 7, 2021 at 2:24 PM Michael Salter <michaelsalter@gmail.com> wro=
te:
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.=C2=A0Secondly removing rotational inertia is not always t=
he 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:=C2=A0 =
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 ac=
celeration.=C2=A0 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 th=
e 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 t=
hat 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.tea=
m.net> wrote:
I have Bill Bolton lightened 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.=C2=A0Both of my cars run just fine, no problems at all in the 20 + or =
so years that I=E2=80=99ve had them installed.=C2=A0Earl KagnaVictoria BCBJ=
8, BT7 tri-carb=C2=A0=C2=A0=C2=A0From: 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=C2=A06 cylinder flywheels vary sligh=
tly but are all generally in the 29 pound range. Very aggressive machine wo=
rk can get the weight down to the 22-23 pound range. How much weight you ta=
ke off will affect your driving style. To maintain the feel of a stock Heal=
ey while still improving the engines response, I suggest removing no more t=
han 3 pounds. =C2=A0Richard =C2=A0=20
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--=20
Best--Michael_______________________________________________
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------=_Part_3863390_1077540266.1631058762374
Content-Transfer-Encoding: quoted-printable
<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">Nitpick=
ing me here . . .. .. .
<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 <healeys@autox.team.net><br>
To: richard mayor <boyracer466@gmail.com><br>
Cc: healeys <healeys@autox.team.net><br>
Sent: Tue, Sep 7, 2021 7:40 pm<br>
Subject: Re: [Healeys] Lightened flywheels<br>
<br>
<div id=3D"yiv1063698908">
<div>
<div dir=3D"ltr">
<div class=3D"yiv1063698908gmail_default" style=3D""><span style=3D"color:r=
gb(51,51,255);">I hesitate to nitpick but as to the statement that </span><=
i style=3D""><font color=3D"#0000ff">"4 to 5 pounds off vehicle weight is r=
eally only the equivalent of half a tank of fuel" </font> </i><fo=
nt 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 approximat=
ely 7.5 lbs per gallon half a tank weighs about 45 pounds. </fon=
t><span style=3D"color:rgb(51,51,255);">The defense rests....</span></div>
<div class=3D"yiv1063698908gmail_default" style=3D""><font color=3D"#3333ff=
"><br clear=3D"none"></font></div>
<div class=3D"yiv1063698908gmail_default" style=3D""><font color=3D"#3333ff=
">Best--Michael Oritt </font></div>
</div>
<br clear=3D"none">
<div class=3D"yiv1063698908gmail_quote">
<div class=3D"yiv1063698908yqt2783158349" id=3D"yiv1063698908yqtfd54840">
<div class=3D"yiv1063698908gmail_attr" dir=3D"ltr">On Tue, Sep 7, 2021 at 6=
:00 PM richard mayor via Healeys <<a shape=3D"rect" ymailto=3D"mailto:he=
aleys@autox.team.net" href=3D"mailto:healeys@autox.team.net"; target=3D"_bla=
nk" rel=3D"noreferrer noopener">healeys@autox.team.net</a>> wrote:<br cl=
ear=3D"none"></div>
</div>
<blockquote class=3D"yiv1063698908gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div class=3D"yiv1063698908yqt2783158349" id=3D"yiv1063698908yqtfd20741">
<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 class=3D"yiv1063698908gmail_quote">
<div class=3D"yiv1063698908gmail_attr" dir=3D"ltr">On Tue, Sep 7, 2021 at 2=
:24 PM Michael Salter <<a shape=3D"rect" ymailto=3D"mailto:michaelsalter=
@gmail.com" href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank" rel=
=3D"noreferrer noopener">michaelsalter@gmail.com</a>> wrote:<br clear=3D=
"none"></div>
<blockquote class=3D"yiv1063698908gmail_quote" 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. </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: <a shape=3D"rect" href=3D"https://www.netbug.net/blog=
michael/2017/01/03/austin-healey-100-crank-failures/" target=3D"_blank" rel=
=3D"noreferrer noopener">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. An engine with a lightened flywheel may accelerate to 60=
00 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 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).</div>
<div><br clear=3D"none"></div>
<div>Just sayin'</div>
<div><br clear=3D"none"></div>
<div>M</div>
</div>
<br clear=3D"none">
<div class=3D"yiv1063698908gmail_quote">
<div class=3D"yiv1063698908gmail_attr" dir=3D"ltr">On Tue., Sep. 7, 2021, 4=
:17 p.m. Earl Kagna via Healeys, <<a shape=3D"rect" ymailto=3D"mailto:he=
aleys@autox.team.net" href=3D"mailto:healeys@autox.team.net"; target=3D"_bla=
nk" rel=3D"noreferrer noopener">healeys@autox.team.net</a>> wrote:<br cl=
ear=3D"none"></div>
<blockquote class=3D"yiv1063698908gmail_quote" 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 class=3D"yiv1063698908MsoNormal">I have Bill Bolton lightened flywheel=
s 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 B=
ills machining program reduced them to 24.<u></u><u></u></div>
<div class=3D"yiv1063698908MsoNormal"><u></u> <u></u></div>
<div class=3D"yiv1063698908MsoNormal">Both of my cars run just fine, no pro=
blems at all in the 20 + or so years that I=E2=80=99ve had them installed.<=
u></u><u></u></div>
<div class=3D"yiv1063698908MsoNormal"><u></u> <u></u></div>
<div class=3D"yiv1063698908MsoNormal">Earl Kagna<u></u><u></u></div>
<div class=3D"yiv1063698908MsoNormal">Victoria BC<u></u><u></u></div>
<div class=3D"yiv1063698908MsoNormal">BJ8, BT7 tri-carb<u></u><u></u></div>
<div class=3D"yiv1063698908MsoNormal"><u></u> <u></u></div>
<div class=3D"yiv1063698908MsoNormal"><u></u> <u></u></div>
<div class=3D"yiv1063698908MsoNormal"><u></u> <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 class=3D"yiv1063698908MsoNormal"><b>From:</b> Healeys <<a shape=3D"=
rect" ymailto=3D"mailto:healeys-bounces@autox.team.net"; href=3D"mailto:heal=
eys-bounces@autox.team.net" target=3D"_blank" rel=3D"noreferrer noopener">h=
ealeys-bounces@autox.team.net</a>> <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 <<a shape=3D"rect" ymailto=3D"mailto:healeys@a=
utox.team.net" href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=
=3D"noreferrer noopener">healeys@autox.team.net</a>><br clear=3D"none"><=
b>Subject:</b> [Healeys] Lightened flywheels<u></u><u></u></div>
</div>
<div class=3D"yiv1063698908MsoNormal"><u></u> <u></u></div>
<div>
<div>
<div class=3D"yiv1063698908MsoNormal">6 cylinder flywheels vary slightly bu=
t 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></div>
</div>
<div>
<div class=3D"yiv1063698908MsoNormal">How much weight you take off will aff=
ect 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. <=
u></u><u></u></div>
</div>
<div>
<div class=3D"yiv1063698908MsoNormal"><u></u> <u></u></div>
</div>
<div>
<div class=3D"yiv1063698908MsoNormal">Richard <u></u><u></u></div>
</div>
</div>
</div>
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