[Healeys] Healeys Digest, Vol 17, Issue 98

Craig Cooper craiginchico at gmail.com
Wed Jun 19 14:54:43 MDT 2024 

Re:  Lightened Flywheels

Hi Bob:  I absolutely love the extra power (perceived or actual) in my
Healeys with light flywheels.  My BN1 has one from DW that weighs about 12
pounds and I'm using DW's damper on the front.  The car has an upgraded
crankshaft and BN7 gearbox, so maybe that's kept it from flying apart.  My
BN7 w/BJ8 cam has an alloy flywheel I got on eBay that I think weighs about
20 pounds.  It runs smooth as silk with no ill effects.  I still can get
occasional run-on though, with lower octane fuel.

On the gearbox oil leaks, check the lower bell housing bolts which, at
least on the side shifts, extend into the gearbox and can leak.  Also,
"Quad Ring" OD operating shaft seals are available from AH Spares, part
0VD185MS.  I haven't tried them yet, but it seems like they would be an
improvement over the single O rings generally used.
OVD185MS

On Wed, Jun 19, 2024 at 10:59 AM <healeys-request at autox.team.net> wrote:

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>    1. Re: Lightened Flywheels (Hank Leach)
>    2. Re: Lightened Flywheels (Bob Spidell)
>    3. Re: Lightened Flywheels (Hank Leach)
>    4. Re: Lightened Flywheels (Michael Salter)
>    5. Re: *** SPAM *** Re:  Lightened Flywheels (Reinhart Rosner)
>    6. Re: Lightened Flywheels (Harold Manifold)
>
>
>
> ---------- Forwarded message ----------
> From: Hank Leach <gradea1 at charter.net>
> To: Bob Spidell <bspidell at comcast.net>, Healeys <healeys at autox.team.net>
> Cc:
> Bcc:
> Date: Tue, 18 Jun 2024 18:10:50 +0000
> Subject: Re: [Healeys] Lightened Flywheels
> 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 at comcast.net>
> To: "Healeys" <healeys at 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:
> http://www.team.net/pipermail/healeys
> http://autox.team.net/archive/healeys Healeys at autox.team.net
> http://autox.team.net/mailman/listinfo/healeys Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/gradea1@charter.net
>
>
>
> ---------- Forwarded message ----------
> From: Bob Spidell <bspidell at comcast.net>
> To: gradea1 at charter.net, Healeys <healeys at autox.team.net>
> Cc:
> Bcc:
> Date: Tue, 18 Jun 2024 11:45:36 -0700
> Subject: Re: [Healeys] Lightened Flywheels
> 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" <bspidell at comcast.net>
> > To: "Healeys" <healeys at 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: http://www.team.net/pipermail/healeys
> > http://autox.team.net/archive/healeys Healeys at autox.team.net
> > http://autox.team.net/mailman/listinfo/healeys Unsubscribe/Manage:
> > http://autox.team.net/mailman/options/healeys/gradea1@charter.net
>
>
>
>
>
> ---------- Forwarded message ----------
> From: Hank Leach <gradea1 at charter.net>
> To: Bob Spidell <bspidell at comcast.net>, Healeys <healeys at autox.team.net>
> Cc:
> Bcc:
> Date: Tue, 18 Jun 2024 18:57:12 +0000
> Subject: Re: [Healeys] Lightened Flywheels
> OK BJ8 issue...that is a lighter flywheel.  I still recommend dumping the
> clutch to stop any run-on. Might check your timing with a light and set it
> to 17 degrees to compensate for the lousy fuel we get today. That appears
> to tbe the magic number for most of the old British iron- used to 95+
> octane fuels. When those cars were built there was no corn in the fuel. Sad
> that many of our classics are now running on volts and amps.
> An aside-on the old 100 gearbox, with just rifling for a seal, I add an
> o-ring to the input shaft to "contain the spinout. Hank
> --------------------
>
> From: "Bob Spidell" <bspidell at comcast.net>
> To: <gradea1 at charter.net>, "Healeys" <healeys at autox.team.net>
> Sent: June 18, 2024 at 11:46 AM PDT
> Subject: Re: [Healeys] Lightened Flywheels
> 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" <bspidell at comcast.net> > To: "Healeys" <
> healeys at 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: http://www.team.net/pipermail/healeys >
> http://autox.team.net/archive/healeys Healeys at autox.team.net >
> http://autox.team.net/mailman/listinfo/healeys Unsubscribe/Manage: >
> http://autox.team.net/mailman/options/healeys/gradea1@charter.net
>
>
>
> ---------- Forwarded message ----------
> From: Michael Salter <michaelsalter at gmail.com>
> To: Hank Leach <gradea1 at charter.net>
> Cc: Bob Spidell <bspidell at comcast.net>, Healeys <healeys at autox.team.net>
> Bcc:
> Date: Tue, 18 Jun 2024 15:20:15 -0400
> Subject: Re: [Healeys] Lightened Flywheels
> 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 at 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 at comcast.net>
>> To: "Healeys" <healeys at 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: http://www.team.net/pipermail/healeys
>> http://autox.team.net/archive/healeys Healeys at autox.team.net
>> http://autox.team.net/mailman/listinfo/healeys Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/healeys/gradea1@charter.net
>> _______________________________________________
>> 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
>>
>> Healeys at autox.team.net
>> http://autox.team.net/mailman/listinfo/healeys
>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com
>>
>>
>
>
> ---------- Forwarded message ----------
> From: Reinhart Rosner <reinhart.rosner at aon.at>
> To: <gradea1 at charter.net>, "'Bob Spidell'" <bspidell at comcast.net>, <
> healeys at autox.team.net>
> Cc:
> Bcc:
> Date: Tue, 18 Jun 2024 22:24:24 +0200
> Subject: Re: [Healeys] *** SPAM *** Re:  Lightened Flywheels
>
> 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.
>
> Reinhart
>
>
>
> Reinhart Rosner
>
> 55 100 BN 1
>
> Vienna - Austria
>
>
>
> *Von:* Healeys [mailto:healeys-bounces at autox.team.net] *Im Auftrag von *Hank
> Leach via Healeys
> *Gesendet:* Dienstag, 18. Juni 2024 20:11
> *An:* Bob Spidell; Healeys
> *Betreff:* *** SPAM *** Re: [Healeys] Lightened Flywheels
>
>
>
> 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 at comcast.net>
> To: "Healeys" <healeys at 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
>
>
>
> ---------- Forwarded message ----------
> From: Harold Manifold <manifold at telus.net>
> To: Michael Salter <michaelsalter at gmail.com>
> Cc: Hank Leach <gradea1 at charter.net>, Healeys <healeys at autox.team.net>
> Bcc:
> Date: Tue, 18 Jun 2024 14:07:39 -0700
> Subject: Re: [Healeys] Lightened Flywheels
> 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 PM Michael Salter <michaelsalter at gmail.com>
> wrote:
>
>> 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 at 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 at comcast.net>
>>> To: "Healeys" <healeys at 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 _______________________________________________
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>>> _______________________________________________
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