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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, <
healeys@autox.team.net> 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" <bspidell@comcast.net>
> To: "Healeys" <healeys@autox.team.net>
> 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:
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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 "snappy" 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, <<a href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net<=
/a>> 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'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: "Bob Spidell" <<a href=3D"mailto:bspi=
dell@comcast.net" target=3D"_blank" rel=3D"noreferrer">bspidell@comcast.net=
</a>> <br>To: "Healeys" <<a href=3D"mailto:healeys@autox.te=
am.net" target=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a>>=
<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'll have to pull my BJ8's gearbox/OD to r=
eplace a leaky front seal, so I'm thinking of installing a lightened fl=
ywheel while I'm at it. My main reason for considering it is to stop so=
me 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 happ=
ens 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 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'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 'Dyno Master' on EM said he'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'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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ys" target=3D"_blank" rel=3D"noreferrer">http://autox.team.net/archive/heal=
eys</a> <a href=3D"mailto:Healeys@autox.team.net"; target=3D"_blank" rel=3D"=
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charter.net</a></div>
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</blockquote></div>
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