Subject: Re: [Healeys] Lightened Flywheels

From: Bob Spidell <[email-masked]> pPekuLE8iT0DhkEQRhSDiWvCR8E7muBqH7G9F9fS9noZ2BWF0vyoeg9qGBKXxiV4W9+FQNWi8rb+EhecvZXo6nCPFEn3PpPFWUgEK/zV13FfaFulkEc2te9u
Date: Tue, 18 Jun 2024 11:45:36 -0700

Thanks, Hank. To clarify, the seal I need to replace is at the front of 
the gearbox; i.e. the input shaft seal on my BJ8 gearbox. I'm pretty 
sure that's the source of the leak--disappointing, since the rebuild 
only a few years ago--because it smells like the MT-90 I use in my 
gearboxes (I know, syn leaks, but this box probably has 10K miles on it 
before it erupted). I also spent time and effort sealing the O/D drain, 
since I initially assumed it was the source of the leak. Makes me wonder 
if seal quality has suffered, like a lot of things. Pretty sure I 
checked the input shaft for wear.

I'm about (re-convinced) to forgo a lightened flywheel, since it 
apparently causes no harm (just have to remember to do it). I've heard 
it can actually cause an engine to run backwards, which would be all 
kinds of bad.

bs

On 6/18/2024 11:10 AM, Hank Leach wrote:
> The best way to stop run on is foot on brake, car in gear-It's not 
> hurting anything and is recommended by the likes of Geoff Healey and 
> others. Denotation has a worse effect on the engine.
> The downside of the lightened flywheel is a heavier clutch engagement. 
> That said the heaviest part I ever picked up is a 100 flywheel.  Egad, 
> what a hunk of metal!
> -However the issues with the flywheel/cracked crankshaft can be traced 
> to a lack of a front pulley dampener and that might be the better 
> solution to the issue.  It may in fact make dumping the clutch easier 
> on the drivetrain, but not proven. Since your problem is with the 
> front of the engine, I would address the seal replacement -felt if you 
> are a purest -or yes, the modern solution fancy cover to stop drips on 
> the floor. I collect my Healey oil in a small swimming pool I 
> constructed to hold leaks, while in storage. Then some kerosene 
> quickly cleans up the mess when the car is moved. Since they no longer 
> oil the roadways, think of the benifit you are supplying to the 
> asphalt in longer life. Hank-------------------
>
> From: "Bob Spidell" <[email-masked]>
> To: "Healeys" <[email-masked]>
> Sent: June 18, 2024 at 10:03 AM PDT
> Subject: [Healeys] Lightened Flywheels
> Listers,
> I know this one has been discussed--well, beat to death--but it looks 
> like I'll have to pull my BJ8's gearbox/OD to replace a leaky front 
> seal, so I'm thinking of installing a lightened flywheel while I'm at 
> it. My main reason for considering it is to stop some pretty 
> significant run-on ('dieseling,' which I get on my BN2 as well). I'm 
> not totally comfortable with dropping the clutch in gear to stop it, 
> and any performance improvements would be a plus. It just so happens I 
> just caught an episode of 'Engine Masters' on MotorTrend TV, where 
> they seriously reduced the rotating mass of an engine--an SBC, which 
> is what they mostly do--and got some interesting results: more HP and 
> torque, as measured on a topnotch dyno. The gains were shown primarily 
> on acceleration which, intuitively I suppose, were greater when RPM 
> was raised at 300RPM/minute vs. 600. Any constant speed increases 
> weren't addressed as far as I could tell. The late, great Gary 
> Andersen, who raced, said the main benefit was faster spin-up for 
> rev-matching downshifts; anyone noted any other significant benefits? 
> The 'Dyno Master' on EM said he'd seen timing chain failures with 
> lightened flywheels; my main concern for both my Healeys has been 
> reliability, with minimal maintenance required, but if it 
> stops/minimizes the run-on I'd be happy. Anyone know how far you can 
> go lightening without adverse effects? TIA, Bob 
> _______________________________________________ Support Team.Net 
> http://www.team.net/donate.html Suggested annual donation $12.75 
> Archive: http://www.team.net/pipermail/healeys 
> http://autox.team.net/archive/healeys [email-masked] 
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From: Michael Salter <[email-masked]>
Date: Tue, 18 Jun 2024 15:20:15 -0400

--===============1433701867711216583==

--00000000000059bc90061b2ef9d6

When it comes to flywheel weight the 6 cylinder and 4 cylinder have hugely
different requirements.  The natural balance of the 6 means that there is
much less change in rotational speed during each revolution and with the
crankshaft itself being much heavier the gearbox requires much less
protection.
The type of driving that I do these days does not require "snappy" gear
changes so I would tend to leave the flywheel as designed as I really
appreciate the smoothness of the 6 cylinder engines however, each to his
own.
I  would definitely not lighten a 100 flywheel, particularly a BN1, for
fear of eventually damaging the gearbox for the reasons described in this
article.
https://precisionsportscar.com/austin-healey-100-crank-failures/

M

On Tue., Jun. 18, 2024, 2:48 p.m. Hank Leach via Healeys, <
[email-masked]> wrote:

> The best way to stop run on is foot on brake, car in gear-It's not hurting
> anything and is recommended by the likes of Geoff Healey and others.
> Denotation has a worse effect on the engine.
> That said the heaviest part I ever picked up is a 100 flywheel.  Egad, what
> a hunk of metal!
> -However the issues with the flywheel/cracked crankshaft can be traced to
> a lack of a front pulley dampener and that might be the better solution to
> the issue.  It may in fact make dumping the clutch easier on the
> drivetrain, but not proven. Since your problem is with the front of the
> engine, I would address the seal replacement -felt if you are a purest -or
> yes, the modern solution fancy cover to stop drips on the floor. I collect
> my Healey oil in a small swimming pool I constructed to hold leaks, while
> in storage. Then some kerosene quickly cleans up the mess when the car is
> moved. Since they no longer oil the roadways, think of the benifit you are
> supplying to the asphalt in longer life. Hank-------------------
>
> I know this one has been discussed--well, beat to death--but it looks like
> I'll have to pull my BJ8's gearbox/OD to replace a leaky front seal, so I'm
> thinking of installing a lightened flywheel while I'm at it. My main reason
> for considering it is to stop some pretty significant run-on ('dieseling,'
> which I get on my BN2 as well). I'm not totally comfortable with dropping
> the clutch in gear to stop it, and any performance improvements would be a
> plus. It just so happens I just caught an episode of 'Engine Masters' on
> MotorTrend TV, where they seriously reduced the rotating mass of an
> engine--an SBC, which is what they mostly do--and got some interesting
> results: more HP and torque, as measured on a topnotch dyno. The gains were
> shown primarily on acceleration which, intuitively I suppose, were greater
> when RPM was raised at 300RPM/minute vs. 600. Any constant speed increases
> weren't addressed as far as I could tell. The late, great Gary Andersen,
> who raced, said the main benefit was faster spin-up for rev-matching
> downshifts; anyone noted any other significant benefits? The 'Dyno Master'
> on EM said he'd seen timing chain failures with lightened flywheels; my
> main concern for both my Healeys has been reliability, with minimal
> maintenance required, but if it stops/minimizes the run-on I'd be happy.
> Anyone know how far you can go lightening without adverse effects? TIA, Bob
> http://www.team.net/donate.html Suggested annual donation $12.75 Archive:
> http://www.team.net/pipermail/healeys
> http://autox.team.net/archive/healeys
>
> [email-masked]
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>

--00000000000059bc90061b2ef9d6
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">When it comes to flywheel weight the 6 cylinder and 4 cyl=
inder have hugely different requirements.=C2=A0 The natural balance of the =
6 means that there is much less change in rotational speed during each revo=
lution and with the crankshaft itself being much heavier the gearbox requir=
es much less protection.=C2=A0<div dir=3D"auto">The type of driving that I =
do these days does not require &quot;snappy&quot; gear changes so I would t=
end to leave the flywheel as designed as I really appreciate the smoothness=
 of the 6 cylinder engines however, each to his own.</div><div dir=3D"auto"=
>I=C2=A0 would definitely not lighten a 100 flywheel, particularly a BN1, f=
or fear of eventually damaging the gearbox for the reasons described in thi=
s article.=C2=A0</div><div dir=3D"auto"><a href=3D"https://precisionsportsc=
ar.com/austin-healey-100-crank-failures/">https://precisionsportscar.com/au=
stin-healey-100-crank-failures/</a><br></div><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr">On Tue., Jun. 18, 2024, 2:48 p.m. Hank Leach via Hea=
leys, &lt;<a href=3D"mailto:[email-masked]">[email-masked]<=
/a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>The best way to=
 stop run on is foot on brake, car in gear-It&#39;s not hurting anything an=
d is recommended by the likes of Geoff Healey and others. Denotation has a =
worse effect on the engine.</div>
<div>The downside of the lightened flywheel is a heavier clutch engagement.=
 That said the heaviest part I ever picked up is a 100 flywheel.=C2=A0 Egad=
, what a hunk of metal!<br>-However the issues with the flywheel/cracked cr=
ankshaft can be traced to a lack of a front pulley dampener and that might =
be the better solution to the issue.=C2=A0 It may in fact make dumping the =
clutch easier on the drivetrain, but not proven. Since your problem is with=
 the front of the engine, I would address the seal replacement -felt if you=
 are a purest -or yes, the modern solution fancy cover to stop drips on the=
 floor. I collect my Healey oil in a small swimming pool I constructed to h=
old leaks, while in storage. Then some kerosene quickly cleans up the mess =
when the car is moved. Since they no longer oil the roadways, think of the =
benifit you are supplying to the asphalt in longer life. Hank--------------=
-----=C2=A0<br><br>From: &quot;Bob Spidell&quot; &lt;<a href=3D"mailto:bspi=
[email-masked]" target=3D"_blank" rel=3D"noreferrer">[email-masked]=
</a>&gt; <br>To: &quot;Healeys&quot; &lt;<a href=3D"mailto:[email-masked]=
am.net" target=3D"_blank" rel=3D"noreferrer">[email-masked]</a>&gt;=
 <br>Sent: June 18, 2024 at 10:03 AM PDT <br>Subject: [Healeys] Lightened F=
lywheels <br>Listers,<br>I know this one has been discussed--well, beat to =
death--but it looks like I&#39;ll have to pull my BJ8&#39;s gearbox/OD to r=
eplace a leaky front seal, so I&#39;m thinking of installing a lightened fl=
ywheel while I&#39;m at it. My main reason for considering it is to stop so=
me pretty significant run-on (&#39;dieseling,&#39; which I get on my BN2 as=
 well). I&#39;m not totally comfortable with dropping the clutch in gear to=
 stop it, and any performance improvements would be a plus. It just so happ=
ens I just caught an episode of &#39;Engine Masters&#39; on MotorTrend TV, =
where they seriously reduced the rotating mass of an engine--an SBC, which =
is what they mostly do--and got some interesting results: more HP and torqu=
e, as measured on a topnotch dyno. The gains were shown primarily on accele=
ration which, intuitively I suppose, were greater when RPM was raised at 30=
0RPM/minute vs. 600. Any constant speed increases weren&#39;t addressed as =
far as I could tell. The late, great Gary Andersen, who raced, said the mai=
n benefit was faster spin-up for rev-matching downshifts; anyone noted any =
other significant benefits? The &#39;Dyno Master&#39; on EM said he&#39;d s=
een timing chain failures with lightened flywheels; my main concern for bot=
h my Healeys has been reliability, with minimal maintenance required, but i=
f it stops/minimizes the run-on I&#39;d be happy. Anyone know how far you c=
an go lightening without adverse effects? TIA, Bob ________________________=
_______________________ Support Team.Net <a href=3D"http://www.team.net/don=
ate.html" target=3D"_blank" rel=3D"noreferrer">http://www.team.net/donate.h=
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charter.net</a></div>
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er" target=3D"_blank">http://autox.team.net/archive/healeys</a><br>
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eys</a><br>
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r>
<br>
</blockquote></div>

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[email-masked]

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---

From: "Reinhart Rosner" <[email-masked]>
Date: Tue, 18 Jun 2024 22:24:24 +0200

This is a multipart message in MIME format.

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Run-on: My mechanic told me to use fuel with 98 octane (instead of 95) =
and if it still happens to step on the gas pedal when shutting down the =
engine. This works good for me.=20

Reinhart

=20

Reinhart Rosner

55 100 BN 1

Vienna - Austria

=20

Von: Healeys [mailto:[email-masked]] Im Auftrag von Hank =
Leach via Healeys
Gesendet: Dienstag, 18. Juni 2024 20:11
An: Bob Spidell; Healeys
Betreff: *** SPAM *** Re: [Healeys] Lightened Flywheels

=20

The best way to stop run on is foot on brake, car in gear-It's not =
hurting anything and is recommended by the likes of Geoff Healey and =
others. Denotation has a worse effect on the engine.

The downside of the lightened flywheel is a heavier clutch engagement. =
That said the heaviest part I ever picked up is a 100 flywheel.  Egad, =
what a hunk of metal!
-However the issues with the flywheel/cracked crankshaft can be traced =
to a lack of a front pulley dampener and that might be the better =
solution to the issue.  It may in fact make dumping the clutch easier on =
the drivetrain, but not proven. Since your problem is with the front of =
the engine, I would address the seal replacement -felt if you are a =
purest -or yes, the modern solution fancy cover to stop drips on the =
floor. I collect my Healey oil in a small swimming pool I constructed to =
hold leaks, while in storage. Then some kerosene quickly cleans up the =
mess when the car is moved. Since they no longer oil the roadways, think =
of the benifit you are supplying to the asphalt in longer life. =
Hank-------------------=20

From: "Bob Spidell" <[email-masked]>=20
To: "Healeys" <[email-masked]>=20
Sent: June 18, 2024 at 10:03 AM PDT=20
Subject: [Healeys] Lightened Flywheels=20
Listers,
I know this one has been discussed--well, beat to death--but it looks =
like I'll have to pull my BJ8's gearbox/OD to replace a leaky front =
seal, so I'm thinking of installing a lightened flywheel while I'm at =
it. My main reason for considering it is to stop some pretty significant =
run-on ('dieseling,' which I get on my BN2 as well). I'm not totally =
comfortable with dropping the clutch in gear to stop it, and any =
performance improvements would be a plus. It just so happens I just =
caught an episode of 'Engine Masters' on MotorTrend TV, where they =
seriously reduced the rotating mass of an engine--an SBC, which is what =
they mostly do--and got some interesting results: more HP and torque, as =
measured on a topnotch dyno. The gains were shown primarily on =
acceleration which, intuitively I suppose, were greater when RPM was =
raised at 300RPM/minute vs. 600. Any constant speed increases weren't =
addressed as far as I could tell. The late, great Gary Andersen, who =
raced, said the main benefit was faster spin-up for rev-matching =
downshifts; anyone noted any other significant benefits? The 'Dyno =
Master' on EM said he'd seen timing chain failures with lightened =
flywheels; my main concern for both my Healeys has been reliability, =
with minimal maintenance required, but if it stops/minimizes the run-on =
I'd be happy. Anyone know how far you can go lightening without adverse =
effects? TIA, Bob=20

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</o:shapelayout></xml><![endif]--></head><body lang=3DDE-AT link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-GB =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Run-on: My mechanic told me to use fuel with 98 octane (instead of =
95) and if it still happens to step on the gas pedal when shutting down =
the engine. This works good for me. <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Reinhart<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Reinhart Rosner<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>55 100 BN 1<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Vienna - Austria<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><b><span lang=3DDE =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span><=
/b><span lang=3DDE =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Healeys =
[mailto:[email-masked]] <b>Im Auftrag von </b>Hank Leach =
via Healeys<br><b>Gesendet:</b> Dienstag, 18. Juni 2024 =
20:11<br><b>An:</b> Bob Spidell; Healeys<br><b>Betreff:</b> *** SPAM *** =
Re: [Healeys] Lightened Flywheels<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal>The =
best way to stop run on is foot on brake, car in gear-It's not hurting =
anything and is recommended by the likes of Geoff Healey and others. =
Denotation has a worse effect on the engine.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>The downside of the lightened flywheel is a heavier =
clutch engagement. That said the heaviest part I ever picked up is a 100 =
flywheel.&nbsp; Egad, what a hunk of metal!<br>-However the issues with =
the flywheel/cracked crankshaft can be traced to a lack of a front =
pulley dampener and that might be the better solution to the =
issue.&nbsp; It may in fact make dumping the clutch easier on the =
drivetrain, but not proven. Since your problem is with the front of the =
engine, I would address the seal replacement -felt if you are a purest =
-or yes, the modern solution fancy cover to stop drips on the floor. I =
collect my Healey oil in a small swimming pool I constructed to hold =
leaks, while in storage. Then some kerosene quickly cleans up the mess =
when the car is moved. Since they no longer oil the roadways, think of =
the benifit you are supplying to the asphalt in longer life. =
Hank-------------------&nbsp;<br><br>From: &quot;Bob Spidell&quot; =
&lt;[email-masked]&gt; <br>To: &quot;Healeys&quot; =
&lt;[email-masked]&gt; <br>Sent: June 18, 2024 at 10:03 AM PDT =
<br>Subject: [Healeys] Lightened Flywheels <br>Listers,<br>I know this =
one has been discussed--well, beat to death--but it looks like I'll have =
to pull my BJ8's gearbox/OD to replace a leaky front seal, so I'm =
thinking of installing a lightened flywheel while I'm at it. My main =
reason for considering it is to stop some pretty significant run-on =
('dieseling,' which I get on my BN2 as well). I'm not totally =
comfortable with dropping the clutch in gear to stop it, and any =
performance improvements would be a plus. It just so happens I just =
caught an episode of 'Engine Masters' on MotorTrend TV, where they =
seriously reduced the rotating mass of an engine--an SBC, which is what =
they mostly do--and got some interesting results: more HP and torque, as =
measured on a topnotch dyno. The gains were shown primarily on =
acceleration which, intuitively I suppose, were greater when RPM was =
raised at 300RPM/minute vs. 600. Any constant speed increases weren't =
addressed as far as I could tell. The late, great Gary Andersen, who =
raced, said the main benefit was faster spin-up for rev-matching =
downshifts; anyone noted any other significant benefits? The 'Dyno =
Master' on EM said he'd seen timing chain failures with lightened =
flywheels; my main concern for both my Healeys has been reliability, =
with minimal maintenance required, but if it stops/minimizes the run-on =
I'd be happy. Anyone know how far you can go lightening without adverse =
effects? TIA, Bob <span =
style=3D'color:#1F497D'><o:p></o:p></span></p></div></div></body></html>
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[email-masked]

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From: Harold Manifold via Healeys <[email-masked]>
Date: Tue, 18 Jun 2024 14:07:39 -0700

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Bob,

I lightened the flywheel on my BT7 with no ill effects. The engine is
responsive and revs smoothly. The Healey's with the spring type clutch like
mine have a heavier flywheel than the later flywheel used with the
diaphragm clutch. To some degree BJ8's already have a lightened flywheel
compared to the earlier 6 cylinder Healey's. Picture of the flywheel is
attached.

I use the technique described by Hank when shutting off the engine and
there is no run on.

Harold

On Tue, Jun 18, 2024 at 1:13=E2=80=AFPM Michael Salter <michaelsalter@gmail=
.com>
wrote:

> When it comes to flywheel weight the 6 cylinder and 4 cylinder have hugel=
y
>> That said the heaviest part I ever picked up is a 100 flywheel.  Egad, w=
hat
>> a hunk of metal!
>> -However the issues with the flywheel/cracked crankshaft can be traced t=
o
>> a lack of a front pulley dampener and that might be the better solution =
to
>> engine, I would address the seal replacement -felt if you are a purest -=
or
>> yes, the modern solution fancy cover to stop drips on the floor. I colle=
ct
>> my Healey oil in a small swimming pool I constructed to hold leaks, whil=
e
>> in storage. Then some kerosene quickly cleans up the mess when the car i=
s
>> moved. Since they no longer oil the roadways, think of the benifit you a=
re
>> like I'll have to pull my BJ8's gearbox/OD to replace a leaky front seal=
,
>> so I'm thinking of installing a lightened flywheel while I'm at it. My m=
ain
>> reason for considering it is to stop some pretty significant run-on
>> ('dieseling,' which I get on my BN2 as well). I'm not totally comfortabl=
e
>> with dropping the clutch in gear to stop it, and any performance
>> improvements would be a plus. It just so happens I just caught an episod=
e
>> of 'Engine Masters' on MotorTrend TV, where they seriously reduced the
>> rotating mass of an engine--an SBC, which is what they mostly do--and go=
t
>> some interesting results: more HP and torque, as measured on a topnotch
>> dyno. The gains were shown primarily on acceleration which, intuitively =
I
>> suppose, were greater when RPM was raised at 300RPM/minute vs. 600. Any
>> constant speed increases weren't addressed as far as I could tell. The
>> late, great Gary Andersen, who raced, said the main benefit was faster
>> spin-up for rev-matching downshifts; anyone noted any other significant
>> benefits? The 'Dyno Master' on EM said he'd seen timing chain failures w=
ith
>> reliability, with minimal maintenance required, but if it stops/minimize=
s
>> the run-on I'd be happy. Anyone know how far you can go lightening witho=
ut
>> adverse effects? TIA, Bob ______________________________________________=
_
>> Support Team.Net http://www.team.net/donate.html Suggested annual
>> donation $12.75 Archive: http://www.team.net/pipermail/healeys
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>

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<div dir=3D"ltr">Bob,<div><br></div><div>I lightened the flywheel on my BT7=
 with no ill effects. The engine is responsive and revs smoothly. The Heale=
y&#39;s with the spring type clutch like mine have a heavier flywheel than =
the later flywheel used with the diaphragm=C2=A0clutch. To some degree BJ8&=
#39;s already have a lightened flywheel compared to the earlier 6 cylinder =
Healey&#39;s. Picture of the flywheel is attached.</div><div><br></div><div=
>I use the technique described by Hank when shutting off the engine and the=
re is no run on.</div><div><br></div><div>Harold</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jun 18, 2024=
 at 1:13=E2=80=AFPM Michael Salter &lt;<a href=3D"mailto:michaelsalter@gmai=
l.com">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"auto">When it comes to flywheel w=
eight the 6 cylinder and 4 cylinder have hugely different requirements.=C2=
=A0 The natural balance of the 6 means that there is much less change in ro=
tational speed during each revolution and with the crankshaft itself being =
much heavier the gearbox requires much less protection.=C2=A0<div dir=3D"au=
to">The type of driving that I do these days does not require &quot;snappy&=
quot; gear changes so I would tend to leave the flywheel as designed as I r=
eally appreciate the smoothness of the 6 cylinder engines however, each to =
his own.</div><div dir=3D"auto">I=C2=A0 would definitely not lighten a 100 =
flywheel, particularly a BN1, for fear of eventually damaging the gearbox f=
or the reasons described in this article.=C2=A0</div><div dir=3D"auto"><a h=
ref=3D"https://precisionsportscar.com/austin-healey-100-crank-failures/" ta=
rget=3D"_blank">https://precisionsportscar.com/austin-healey-100-crank-fail=
ures/</a><br></div><div dir=3D"auto"><br></div><div dir=3D"auto">M</div></d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On =
Tue., Jun. 18, 2024, 2:48 p.m. Hank Leach via Healeys, &lt;<a href=3D"mailt=
o:[email-masked]" target=3D"_blank">[email-masked]</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>The =
best way to stop run on is foot on brake, car in gear-It&#39;s not hurting =
anything and is recommended by the likes of Geoff Healey and others. Denota=
tion has a worse effect on the engine.</div>
<div>The downside of the lightened flywheel is a heavier clutch engagement.=
 That said the heaviest part I ever picked up is a 100 flywheel.=C2=A0 Egad=
, what a hunk of metal!<br>-However the issues with the flywheel/cracked cr=
ankshaft can be traced to a lack of a front pulley dampener and that might =
be the better solution to the issue.=C2=A0 It may in fact make dumping the =
clutch easier on the drivetrain, but not proven. Since your problem is with=
 the front of the engine, I would address the seal replacement -felt if you=
 are a purest -or yes, the modern solution fancy cover to stop drips on the=
 floor. I collect my Healey oil in a small swimming pool I constructed to h=
old leaks, while in storage. Then some kerosene quickly cleans up the mess =
when the car is moved. Since they no longer oil the roadways, think of the =
benifit you are supplying to the asphalt in longer life. Hank--------------=
-----=C2=A0<br><br>From: &quot;Bob Spidell&quot; &lt;<a href=3D"mailto:bspi=
[email-masked]" rel=3D"noreferrer" target=3D"_blank">[email-masked]=
</a>&gt; <br>To: &quot;Healeys&quot; &lt;<a href=3D"mailto:[email-masked]=
am.net" rel=3D"noreferrer" target=3D"_blank">[email-masked]</a>&gt;=
 <br>Sent: June 18, 2024 at 10:03 AM PDT <br>Subject: [Healeys] Lightened F=
lywheels <br>Listers,<br>I know this one has been discussed--well, beat to =
death--but it looks like I&#39;ll have to pull my BJ8&#39;s gearbox/OD to r=
eplace a leaky front seal, so I&#39;m thinking of installing a lightened fl=
ywheel while I&#39;m at it. My main reason for considering it is to stop so=
me pretty significant run-on (&#39;dieseling,&#39; which I get on my BN2 as=
 well). I&#39;m not totally comfortable with dropping the clutch in gear to=
 stop it, and any performance improvements would be a plus. It just so happ=
ens I just caught an episode of &#39;Engine Masters&#39; on MotorTrend TV, =
where they seriously reduced the rotating mass of an engine--an SBC, which =
is what they mostly do--and got some interesting results: more HP and torqu=
e, as measured on a topnotch dyno. The gains were shown primarily on accele=
ration which, intuitively I suppose, were greater when RPM was raised at 30=
0RPM/minute vs. 600. Any constant speed increases weren&#39;t addressed as =
far as I could tell. The late, great Gary Andersen, who raced, said the mai=
n benefit was faster spin-up for rev-matching downshifts; anyone noted any =
other significant benefits? The &#39;Dyno Master&#39; on EM said he&#39;d s=
een timing chain failures with lightened flywheels; my main concern for bot=
h my Healeys has been reliability, with minimal maintenance required, but i=
f it stops/minimizes the run-on I&#39;d be happy. Anyone know how far you c=
an go lightening without adverse effects? TIA, Bob ________________________=
_______________________ Support Team.Net <a href=3D"http://www.team.net/don=
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charter.net</a></div>
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