[Healeys] Lightened flywheels

Bob Haskell rchaskell at earthlink.net
Wed Sep 8 14:21:52 MDT 2021


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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> >>     --
>
> >>
>
> >>     Best--Michael
>
> >>
>
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> >> --
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> >> Best--Michael
>
> >>
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