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Re: [Healeys] Lightened flywheels

To: Bluehealey <bluehealey@gmail.com>, Autox Healeys <Healeys@autox.team.net>
Subject: Re: [Healeys] Lightened flywheels
From: Bob Haskell via Healeys <healeys@autox.team.net>
Date: Wed, 8 Sep 2021 05:45:36 -0400
Delivered-to: mharc@autox.team.net
Delivered-to: Healeys@autox.team.net
References: <020901d7a470$57da84b0$078f8e10$@sbcglobal.net> <4D15BB98-2C0E-40FE-A36B-609717C44F01@gmail.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0
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 â??Lightened Flywheelâ?? 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@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@autox.team.net] *On Behalf Of 
>> *Michael Oritt
>> *Sent:* Tuesday, September 7, 2021 5:40 PM
>> *To:* Keith Pennell <llennep@verizon.net>
>> *Cc:* healeys@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@autox.team.net <mailto:healeys@autox.team.net>> wrote:
>>
>>     Nitpicking me here . . ..  .. .
>>
>>     gallon of gasoline weighs a tad over 6 lbs
>>
>>     :)
>>
>>     -----Original Message-----
>>     From: Michael Oritt via Healeys <healeys@autox.team.net
>>     <mailto:healeys@autox.team.net>>
>>     To: richard mayor <boyracer466@gmail.com
>>     <mailto:boyracer466@gmail.com>>
>>     Cc: healeys <healeys@autox.team.net <mailto:healeys@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@autox.team.net <mailto:healeys@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@gmail.com <mailto:michaelsalter@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@autox.team.net <mailto:healeys@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 Iâ??ve had them installed.
>>
>>                 Earl Kagna
>>
>>                 Victoria BC
>>
>>                 BJ8, BT7 tri-carb
>>
>>                 *From:*Healeys <healeys-bounces@autox.team.net
>>                 <mailto:healeys-bounces@autox.team.net>> *On Behalf
>>                 Of *richard mayor
>>                 *Sent:* Tuesday, September 7, 2021 10:23 AM
>>                 *To:* healeys <healeys@autox.team.net
>>                 <mailto:healeys@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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