[Healeys] Lightened flywheels

[Michael Oritt]

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> 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>
> To: richard mayor <boyracer466 at gmail.com>
> Cc: healeys <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> 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>
> 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/
> 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> 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> *On Behalf Of *richard
> mayor
> *Sent:* Tuesday, September 7, 2021 10:23 AM
> *To:* healeys <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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> --
> Best--Michael
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-- 
Best--Michael
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