<div dir="ltr"><div class="gmail_default" style="font-size:large">Re: Lightened Flywheels</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">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. </div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">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. </div><div class="gmail_default" style="font-size:large"><span style="color:rgb(46,46,46);font-family:Roboto,sans-serif;font-size:13.6px">OVD185MS</span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jun 19, 2024 at 10:59 AM <<a href="mailto:healeys-request@autox.team.net">healeys-request@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg5564609131821140015">Send Healeys mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Re: Lightened Flywheels (Hank Leach)<br>
2. Re: Lightened Flywheels (Bob Spidell)<br>
3. Re: Lightened Flywheels (Hank Leach)<br>
4. Re: Lightened Flywheels (Michael Salter)<br>
5. Re: *** SPAM *** Re: Lightened Flywheels (Reinhart Rosner)<br>
6. Re: Lightened Flywheels (Harold Manifold)<br>
<br><br><br>---------- Forwarded message ----------<br>From: Hank Leach <<a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a>><br>To: Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>>, Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br>Cc: <br>Bcc: <br>Date: Tue, 18 Jun 2024 18:10:50 +0000<br>Subject: Re: [Healeys] Lightened Flywheels<br><div>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.</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. 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. 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------------------- <br><br>From: "Bob Spidell" <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>> <br>To: "Healeys" <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> <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 _______________________________________________ Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a> Suggested annual donation $12.75 Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a> <a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a> <a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a> Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/gradea1@charter.net" target="_blank">http://autox.team.net/mailman/options/healeys/gradea1@charter.net</a></div>
<br><br><br>---------- Forwarded message ----------<br>From: Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>><br>To: <a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a>, Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br>Cc: <br>Bcc: <br>Date: Tue, 18 Jun 2024 11:45:36 -0700<br>Subject: Re: [Healeys] Lightened Flywheels<br>Thanks, Hank. To clarify, the seal I need to replace is at the front of <br>
the gearbox; i.e. the input shaft seal on my BJ8 gearbox. I'm pretty <br>
sure that's the source of the leak--disappointing, since the rebuild <br>
only a few years ago--because it smells like the MT-90 I use in my <br>
gearboxes (I know, syn leaks, but this box probably has 10K miles on it <br>
before it erupted). I also spent time and effort sealing the O/D drain, <br>
since I initially assumed it was the source of the leak. Makes me wonder <br>
if seal quality has suffered, like a lot of things. Pretty sure I <br>
checked the input shaft for wear.<br>
<br>
I'm about (re-convinced) to forgo a lightened flywheel, since it <br>
apparently causes no harm (just have to remember to do it). I've heard <br>
it can actually cause an engine to run backwards, which would be all <br>
kinds of bad.<br>
<br>
bs<br>
<br>
On 6/18/2024 11:10 AM, Hank Leach wrote:<br>
> The best way to stop run on is foot on brake, car in gear-It's not <br>
> hurting anything and is recommended by the likes of Geoff Healey and <br>
> others. Denotation has a worse effect on the engine.<br>
> The downside of the lightened flywheel is a heavier clutch engagement. <br>
> That said the heaviest part I ever picked up is a 100 flywheel. Egad, <br>
> what a hunk of metal!<br>
> -However the issues with the flywheel/cracked crankshaft can be traced <br>
> to a lack of a front pulley dampener and that might be the better <br>
> solution to the issue. It may in fact make dumping the clutch easier <br>
> on the drivetrain, but not proven. Since your problem is with the <br>
> front of the engine, I would address the seal replacement -felt if you <br>
> are a purest -or yes, the modern solution fancy cover to stop drips on <br>
> the floor. I collect my Healey oil in a small swimming pool I <br>
> constructed to hold leaks, while in storage. Then some kerosene <br>
> quickly cleans up the mess when the car is moved. Since they no longer <br>
> oil the roadways, think of the benifit you are supplying to the <br>
> asphalt in longer life. Hank-------------------<br>
><br>
> From: "Bob Spidell" <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>><br>
> To: "Healeys" <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><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 <br>
> like I'll have to pull my BJ8's gearbox/OD to replace a leaky front <br>
> seal, so I'm thinking of installing a lightened flywheel while I'm at <br>
> it. My main reason for considering it is to stop some pretty <br>
> significant run-on ('dieseling,' which I get on my BN2 as well). I'm <br>
> not totally comfortable with dropping the clutch in gear to stop it, <br>
> and any performance improvements would be a plus. It just so happens I <br>
> just caught an episode of 'Engine Masters' on MotorTrend TV, where <br>
> they seriously reduced the rotating mass of an engine--an SBC, which <br>
> is what they mostly do--and got some interesting results: more HP and <br>
> torque, as measured on a topnotch dyno. The gains were shown primarily <br>
> on acceleration which, intuitively I suppose, were greater when RPM <br>
> was raised at 300RPM/minute vs. 600. Any constant speed increases <br>
> weren't addressed as far as I could tell. The late, great Gary <br>
> Andersen, who raced, said the main benefit was faster spin-up for <br>
> rev-matching downshifts; anyone noted any other significant benefits? <br>
> The 'Dyno Master' on EM said he'd seen timing chain failures with <br>
> lightened flywheels; my main concern for both my Healeys has been <br>
> reliability, with minimal maintenance required, but if it <br>
> stops/minimizes the run-on I'd be happy. Anyone know how far you can <br>
> go lightening without adverse effects? TIA, Bob <br>
> _______________________________________________ Support Team.Net <br>
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<br><br><br>---------- Forwarded message ----------<br>From: Hank Leach <<a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a>><br>To: Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>>, Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br>Cc: <br>Bcc: <br>Date: Tue, 18 Jun 2024 18:57:12 +0000<br>Subject: Re: [Healeys] Lightened Flywheels<br><div>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.</div>
<div>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<br>-------------------- <br><br>From: "Bob Spidell" <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>> <br>To: <<a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a>>, "Healeys" <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> <br>Sent: June 18, 2024 at 11:46 AM PDT <br>Subject: Re: [Healeys] Lightened Flywheels <br>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.<br>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" <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>> > To: "Healeys" <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> > 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 > <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a> Suggested annual donation $12.75 > Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> > <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a> <a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a> > <a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a> Unsubscribe/Manage: > <a href="http://autox.team.net/mailman/options/healeys/gradea1@charter.net" target="_blank">http://autox.team.net/mailman/options/healeys/gradea1@charter.net</a></div>
<br><br><br>---------- Forwarded message ----------<br>From: Michael Salter <<a href="mailto:michaelsalter@gmail.com" target="_blank">michaelsalter@gmail.com</a>><br>To: Hank Leach <<a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a>><br>Cc: Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>>, Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br>Bcc: <br>Date: Tue, 18 Jun 2024 15:20:15 -0400<br>Subject: Re: [Healeys] Lightened Flywheels<br><div dir="auto">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. <div dir="auto">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.</div><div dir="auto">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. </div><div dir="auto"><a href="https://precisionsportscar.com/austin-healey-100-crank-failures/" target="_blank">https://precisionsportscar.com/austin-healey-100-crank-failures/</a><br></div><div dir="auto"><br></div><div dir="auto">M</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue., Jun. 18, 2024, 2:48 p.m. Hank Leach via Healeys, <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 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's not hurting anything and 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. 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. 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------------------- <br><br>From: "Bob Spidell" <<a href="mailto:bspidell@comcast.net" rel="noreferrer" target="_blank">bspidell@comcast.net</a>> <br>To: "Healeys" <<a href="mailto:healeys@autox.team.net" rel="noreferrer" target="_blank">healeys@autox.team.net</a>> <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 _______________________________________________ Support Team.Net <a href="http://www.team.net/donate.html" rel="noreferrer" target="_blank">http://www.team.net/donate.html</a> Suggested annual donation $12.75 Archive: <a href="http://www.team.net/pipermail/healeys" rel="noreferrer" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" rel="noreferrer" target="_blank">http://autox.team.net/archive/healeys</a> <a href="mailto:Healeys@autox.team.net" rel="noreferrer" target="_blank">Healeys@autox.team.net</a> <a href="http://autox.team.net/mailman/listinfo/healeys" rel="noreferrer" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a> Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/gradea1@charter.net" rel="noreferrer" target="_blank">http://autox.team.net/mailman/options/healeys/gradea1@charter.net</a></div>
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<br><br><br>---------- Forwarded message ----------<br>From: Reinhart Rosner <<a href="mailto:reinhart.rosner@aon.at" target="_blank">reinhart.rosner@aon.at</a>><br>To: <<a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a>>, "'Bob Spidell'" <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>>, <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br>Cc: <br>Bcc: <br>Date: Tue, 18 Jun 2024 22:24:24 +0200<br>Subject: Re: [Healeys] *** SPAM *** Re: Lightened Flywheels<br><div lang="DE-AT"><div class="m_5564609131821140015WordSection1"><p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)">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. <u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)">Reinhart<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)">Reinhart Rosner<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)">55 100 BN 1<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)">Vienna - Austria<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,"sans-serif";color:rgb(31,73,125)"><u></u> <u></u></span></p><p class="MsoNormal"><b><span lang="DE" style="font-size:10pt;font-family:Tahoma,"sans-serif"">Von:</span></b><span lang="DE" style="font-size:10pt;font-family:Tahoma,"sans-serif""> Healeys [mailto:<a href="mailto:healeys-bounces@autox.team.net" target="_blank">healeys-bounces@autox.team.net</a>] <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<u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">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.<u></u><u></u></p></div><div><p class="MsoNormal">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!<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. 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------------------- <br><br>From: "Bob Spidell" <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>> <br>To: "Healeys" <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> <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="color:rgb(31,73,125)"><u></u><u></u></span></p></div></div></div><br><br><br>---------- Forwarded message ----------<br>From: Harold Manifold <<a href="mailto:manifold@telus.net" target="_blank">manifold@telus.net</a>><br>To: Michael Salter <<a href="mailto:michaelsalter@gmail.com" target="_blank">michaelsalter@gmail.com</a>><br>Cc: Hank Leach <<a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a>>, Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br>Bcc: <br>Date: Tue, 18 Jun 2024 14:07:39 -0700<br>Subject: Re: [Healeys] Lightened Flywheels<br><div dir="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 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.</div><div><br></div><div>I use the technique described by Hank when shutting off the engine and there is no run on.</div><div><br></div><div>Harold</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 18, 2024 at 1:13 PM Michael Salter <<a href="mailto:michaelsalter@gmail.com" target="_blank">michaelsalter@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">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. <div dir="auto">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.</div><div dir="auto">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. </div><div dir="auto"><a href="https://precisionsportscar.com/austin-healey-100-crank-failures/" target="_blank">https://precisionsportscar.com/austin-healey-100-crank-failures/</a><br></div><div dir="auto"><br></div><div dir="auto">M</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue., Jun. 18, 2024, 2:48 p.m. Hank Leach via Healeys, <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 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's not hurting anything and 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. 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. 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------------------- <br><br>From: "Bob Spidell" <<a href="mailto:bspidell@comcast.net" rel="noreferrer" target="_blank">bspidell@comcast.net</a>> <br>To: "Healeys" <<a href="mailto:healeys@autox.team.net" rel="noreferrer" target="_blank">healeys@autox.team.net</a>> <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 _______________________________________________ Support Team.Net <a href="http://www.team.net/donate.html" rel="noreferrer" target="_blank">http://www.team.net/donate.html</a> Suggested annual donation $12.75 Archive: <a href="http://www.team.net/pipermail/healeys" rel="noreferrer" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" rel="noreferrer" target="_blank">http://autox.team.net/archive/healeys</a> <a href="mailto:Healeys@autox.team.net" rel="noreferrer" target="_blank">Healeys@autox.team.net</a> <a href="http://autox.team.net/mailman/listinfo/healeys" rel="noreferrer" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a> Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/gradea1@charter.net" rel="noreferrer" target="_blank">http://autox.team.net/mailman/options/healeys/gradea1@charter.net</a></div>
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