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Perhaps another way to look at this question is with respect tp engine
power.
It takes a certain amount of horsepower to accelerate a mass (car) at a
certain rate.
Taking weight off the flywheel decreases the amount of horsepower required
to accelerate the car and for that matter the engine's speed of rotation
but the change in the amount of horsepower required is very small.
Sure engines with light flywheels sound racey but they aren't more powerful=
.
M
On Tue., Sep. 7, 2021, 6:22 p.m. richard mayor, <boyracer466@gmail.com>
wrote:
> I should add one more thing for clarification. The general rule of thum=
b
> for comparing rotational weight to other weight (sprung or unsprung) is 1=
0
> to 1. So, using that rule, 5 pounds of weight removed from rotational ma=
ss
> would equal 50 pounds of fuel. As Michael pointed out.
> But, it doesn't alway work out that way. If you removed one pound from
> the flywheel in the area where the bolt pattern is then the 10 to 1 rule
> may apply. But if you remove one pound of material out near the ring gea=
r
> then it is more like a factor of 30 to 1. Any rotational weight removed
> further away from its axis will have a much greater effect. And when you
> lighten a Healey flywheel the place where the meat comes off first is out
> near the ring gear. Removing 3 or 4 pounds has a big effect on
> acceleration.
>
> 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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1299543942381278781_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
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<div dir=3D"auto">Perhaps another way to look at this question is with resp=
ect tp engine power.=C2=A0<div dir=3D"auto">It takes a certain amount of ho=
rsepower to accelerate a mass (car) at a certain rate.=C2=A0</div><div dir=
=3D"auto">Taking weight off the flywheel decreases the amount of horsepower=
required to accelerate the car and for that matter the engine's speed =
of rotation but the change in the amount of horsepower required is very sma=
ll.</div><div dir=3D"auto">Sure engines with light flywheels sound racey bu=
t they aren't more powerful.</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" clas=
s=3D"gmail_attr">On Tue., Sep. 7, 2021, 6:22 p.m. richard mayor, <<a hre=
f=3D"mailto:boyracer466@gmail.com";>boyracer466@gmail.com</a>> wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>I should add=C2=
=A0 one more thing for clarification.=C2=A0 The general rule of thumb for c=
omparing rotational weight to other weight (sprung or unsprung) is 10 to 1.=
=C2=A0 So, using that rule, 5 pounds of weight removed from rotational mass=
would equal 50 pounds of fuel. As Michael pointed out.</div><div>But, it d=
oesn't alway work out that way.=C2=A0 If you removed one pound from the=
flywheel in the area where the bolt pattern is then the 10 to 1 rule may a=
pply.=C2=A0 But if you remove one pound of material out near the ring gear =
then it is more like a factor of 30 to 1.=C2=A0 Any rotational weight remov=
ed further away from its axis will have a much greater effect. And when you=
lighten a Healey flywheel the place where the meat comes off first is out =
near the ring gear.=C2=A0 Removing 3 or 4 pounds has a big effect on accele=
ration.=C2=A0 <br></div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Tue, Sep 7, 2021 at 2:24 PM Michael Salter <<=
a href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank" rel=3D"noreferr=
er">michaelsalter@gmail.com</a>> wrote:<br></div><blockquote class=3D"gm=
ail_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 completely relevant insofar as engine moment of inertia is concerne=
d.<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 impor=
tant.=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 manufact=
urers would be all over it as a way to save money.</div><div dir=3D"auto">T=
he rotational mass is often designed in to protect the drive train, in part=
icular the gearbox.</div><div dir=3D"auto">Read this:=C2=A0 <a href=3D"http=
s://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-failures/=
" target=3D"_blank" rel=3D"noreferrer">https://www.netbug.net/blogmichael/2=
017/01/03/austin-healey-100-crank-failures/</a></div><div dir=3D"auto">Thir=
dly lightening a flywheel in of itself has very little effect on accelerati=
on.=C2=A0 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 sec=
onds faster to 60 MPH. You may be able to shift marginally faster if the ge=
arbox 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 di=
r=3D"auto"><br></div><div dir=3D"auto">Just sayin'</div><div dir=3D"aut=
o"><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"; rel=3D"no=
referrer noreferrer" target=3D"_blank">healeys@autox.team.net</a>> 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 lang=3D"E=
N-US"><div><p class=3D"MsoNormal">I have Bill Bolton lightened flywheels in=
both my Healeys.=C2=A0 According to Kent Lambert, who took over Bills Heal=
ey 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"MsoNorm=
al"><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 the=
m 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"Mso=
Normal"><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) currentcolor currentcolor;b=
order-style:solid none none;border-width:1pt medium medium;padding:3pt 0in =
0in"><p class=3D"MsoNormal"><b>From:</b> Healeys <<a href=3D"mailto:heal=
eys-bounces@autox.team.net" rel=3D"noreferrer noreferrer noreferrer" target=
=3D"_blank">healeys-bounces@autox.team.net</a>> <b>On Behalf Of </b>rich=
ard 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"noreferrer no=
referrer noreferrer" target=3D"_blank">healeys@autox.team.net</a>><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"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"m_573075059829985210gmail-m_-54513=
47567706541358m_4102748135953362380m_-1299543942381278781DAB4FAD8-2DD7-40BB=
-A1B8-4E2AA1F9FDF2"><br>
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