[Healeys] Lightened flywheels

Michael Salter michaelsalter at gmail.com
Wed Sep 8 14:36:49 MDT 2021 

That's exactly how the factory did the 100S mounts. Obviously a "known"
issue.

M

On Wed., Sep. 8, 2021, 4:22 p.m. Bob Haskell via Healeys, <
healeys at autox.team.net> wrote:

> Something similar was done on the rally cars.  Now, where would I have
> learned that? Hmm.
>
> Cheers,
>
> Bob Haskell
> Austin Healey 3000 BN7/BT7 registrar
>
> On 9/8/21 2:38 PM, Harold Manifold wrote:
> >
> > Here is a picture of a fix for cracked engine mounts an experienced
> > Healey restorer recommended for my car. I was advised it is not
> > unusual for cracks to appear around the engine mounts.
> >
> > Simon – you can’t wait until you remove the engine for this fix!
> >
> > Harold
> >
> > *From: *Bob Haskell via Healeys <mailto:healeys at autox.team.net>
> > *Sent: *Wednesday, September 8, 2021 2:46 AM
> > *To: *Bluehealey <mailto:bluehealey at gmail.com>; Autox Healeys
> > <mailto:Healeys at autox.team.net>
> > *Subject: *Re: [Healeys] Lightened flywheels
> >
> > Alan,
> >
> > Cracking around the engine mount is a pretty common issue, although
> >
> > probably not to the point where the engine mount separates from the
> >
> > frame.  A 20 year old BT7 I bought in 1980 had cracks around the mounts.
> >
> > Cheers,
> >
> > Bob Haskell
> >
> > Austin Healey 3000 BN7/BT7 registrar
> >
> > On 9/8/21 4:13 AM, Bluehealey wrote:
> >
> > > Team.
> >
> > > Whilst this is an interesting topic and ‘Lightened Flywheel’ may have
> >
> > > some bragging rights potential, carrying out this mod does have a down
> >
> > > side.
> >
> > > The reduced flywheel mass creates a more pronounced engine reaction
> >
> > > force in the opposite direction.
> >
> > > I had a BJ8 almost 20 years ago which had a very light flywheel, poor
> >
> > > tick over and quick throttle response. It sounded good. However the
> >
> > > torque reaction was extreme enough to lift the engine mount tower out
> >
> > > of the chassis rails !!
> >
> > > The cracking in the pics have been highlighted with red sharpie for
> >
> > > clarity.
> >
> > > Enjoy
> >
> > >
> >
> > >
> >
> > > Alan - from my iPad
> >
> > >
> >
> > >> On 8 Sep 2021, at 06:16, John Spaur via Healeys
> >
> > >> <healeys at autox.team.net> wrote:
> >
> > >>
> >
> > >> 
> >
> > >>
> >
> > >> More nitpicking.
> >
> > >>
> >
> > >> The density of gasoline is also determined by its temperature and
> >
> > >> chemical makeup. Premium unleaded gasoline has a higher density than
> >
> > >> regular unleaded. Ethanol has a higher density than gasoline without
> >
> > >> ethanol, so the percentage of ethanol needs to be factored in.
> >
> > >> Finally, gasoline is denser at colder temperatures than it is at
> >
> > >> higher temperatures. So please, take all of this into account when
> >
> > >> determining the fuel weight in your cars based on your location and
> >
> > >> the fuel available.
> >
> > >>
> >
> > >> I wonder if the lead content of gasoline increases its weight
> >
> > >> because, as we all know lead, is very heavy. Hahaha
> >
> > >>
> >
> > >> John Spaur
> >
> > >>
> >
> > >> *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of
> >
> > >> *Michael Oritt
> >
> > >> *Sent:* Tuesday, September 7, 2021 5:40 PM
> >
> > >> *To:* Keith Pennell <llennep at verizon.net>
> >
> > >> *Cc:* healeys at autox.team.net
> >
> > >> *Subject:* Re: [Healeys] Lightened flywheels
> >
> > >>
> >
> > >> Keith--
> >
> > >>
> >
> > >> Right you are (and wrong I am) but 6 x 6.3=20+/-which is still more
> >
> > >> than 5...
> >
> > >>
> >
> > >> Best--Michael Oritt
> >
> > >>
> >
> > >> On Tue, Sep 7, 2021 at 7:53 PM llennep--- via Healeys
> >
> > >> <healeys at autox.team.net <mailto:healeys at autox.team.net>> wrote:
> >
> > >>
> >
> > >>     Nitpicking me here . . ..  .. .
> >
> > >>
> >
> > >>     gallon of gasoline weighs a tad over 6 lbs
> >
> > >>
> >
> > >>     :)
> >
> > >>
> >
> > >>     -----Original Message-----
> >
> > >>     From: Michael Oritt via Healeys <healeys at autox.team.net
> >
> > >> <mailto:healeys at autox.team.net>>
> >
> > >>     To: richard mayor <boyracer466 at gmail.com
> >
> > >> <mailto:boyracer466 at gmail.com>>
> >
> > >>     Cc: healeys <healeys at autox.team.net
> > <mailto:healeys at autox.team.net>>
> >
> > >>     Sent: Tue, Sep 7, 2021 7:40 pm
> >
> > >>     Subject: Re: [Healeys] Lightened flywheels
> >
> > >>
> >
> > >>     I hesitate to nitpick but as to the statement that /"4 to 5
> >
> > >>     pounds off vehicle weight is really only the equivalent of half a
> >
> > >>     tank of fuel" ///the last time I looked an AH fuel tank holds
> >
> > >>     about 12 gallons and since gasoline weighs approximately 7.5 lbs
> >
> > >>     per gallon half a tank weighs about 45 pounds.  The defense
> > rests....
> >
> > >>
> >
> > >>     Best--Michael Oritt
> >
> > >>
> >
> > >>     On Tue, Sep 7, 2021 at 6:00 PM richard mayor via Healeys
> >
> > >>     <healeys at autox.team.net <mailto:healeys at autox.team.net>> wrote:
> >
> > >>
> >
> > >>         Michael,
> >
> > >>
> >
> > >>         Comparing the weight of fuel in the gas tank to rotational
> >
> > >>         mass is like comparing apples to bananas.
> >
> > >>
> >
> > >>         Richard
> >
> > >>
> >
> > >>         On Tue, Sep 7, 2021 at 2:24 PM Michael Salter
> >
> > >> <michaelsalter at gmail.com <mailto:michaelsalter at gmail.com>> wrote:
> >
> > >>
> >
> > >>             The total mass of the flywheel is not completely relevant
> >
> > >>             insofar as engine moment of inertia is concerned.
> >
> > >>
> >
> > >>             What is important is the mass removed times the square of
> >
> > >>             the radius, so just how much weight has been removed per
> >
> > >>             se is not important.
> >
> > >>
> >
> > >>             Secondly removing rotational inertia is not always the
> >
> > >>             best thing to do, if it was you can be assured that
> >
> > >>             manufacturers would be all over it as a way to save money.
> >
> > >>
> >
> > >>             The rotational mass is often designed in to protect the
> >
> > >>             drive train, in particular the gearbox.
> >
> > >>
> >
> > >>             Read this:
> >
> > >>
> >
> https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-failures/
> >
> > >>
> > <
> https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-failures/
> >
> >
> > >>
> >
> > >>             Thirdly lightening a flywheel in of itself has very
> >
> > >>             little effect on acceleration. An engine with a lightened
> >
> > >>             flywheel may accelerate to 6000 RPM 1 - 2 seconds more
> >
> > >>             quickly but that doesn't necessarily equate to 1-2
> >
> > >>             seconds faster to 60 MPH. You may be able to shift
> >
> > >>             marginally faster if the gearbox can stand the extra
> >
> > >>             loads and the 4 to 5 pounds off vehicle weight is really
> >
> > >>             only the equivalent of half a tank of fuel. (Who ever
> >
> > >>             notices that their car accelerates more quickly with a
> >
> > >>             half full gas tank).
> >
> > >>
> >
> > >>             Just sayin'
> >
> > >>
> >
> > >>             M
> >
> > >>
> >
> > >>             On Tue., Sep. 7, 2021, 4:17 p.m. Earl Kagna via Healeys,
> >
> > >> <healeys at autox.team.net <mailto:healeys at autox.team.net>>
> >
> > >>             wrote:
> >
> > >>
> >
> > >>                 I have Bill Bolton lightened flywheels in both my
> >
> > >>                 Healeys. According to Kent Lambert, who took over
> >
> > >>                 Bills Healey business awhile back, the stock weight
> >
> > >>                 (6 cyl) is 28.5 pounds, and Bills machining program
> >
> > >>                 reduced them to 24.
> >
> > >>
> >
> > >>                 Both of my cars run just fine, no problems at all in
> >
> > >>                 the 20 + or so years that I’ve had them installed.
> >
> > >>
> >
> > >>                 Earl Kagna
> >
> > >>
> >
> > >>                 Victoria BC
> >
> > >>
> >
> > >>                 BJ8, BT7 tri-carb
> >
> > >>
> >
> > >>                 *From:*Healeys <healeys-bounces at autox.team.net
> >
> > >> <mailto:healeys-bounces at autox.team.net>> *On Behalf
> >
> > >>                 Of *richard mayor
> >
> > >>                 *Sent:* Tuesday, September 7, 2021 10:23 AM
> >
> > >>                 *To:* healeys <healeys at autox.team.net
> >
> > >> <mailto:healeys at autox.team.net>>
> >
> > >>                 *Subject:* [Healeys] Lightened flywheels
> >
> > >>
> >
> > >>                 6 cylinder flywheels vary slightly but are all
> >
> > >>                 generally in the 29 pound range. Very aggressive
> >
> > >>                 machine work can get the weight down to the 22-23
> >
> > >>                 pound range.
> >
> > >>
> >
> > >>                 How much weight you take off will affect your driving
> >
> > >>                 style. To maintain the feel of a stock Healey while
> >
> > >>                 still improving the engines response, I suggest
> >
> > >>                 removing no more than 3 pounds.
> >
> > >>
> >
> > >>                 Richard
> >
> > >>
> >
> > >>
> > <
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> >
> >
> > >>
> >
> > >>
> >
> > >>
> >
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> >
> >
> > >>
> >
> > >>
> >
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> >
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> >
> > >>     --
> >
> > >>
> >
> > >>     Best--Michael
> >
> > >>
> >
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> >
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