[Healeys] Lightened flywheels
Bob Haskell
rchaskell at earthlink.net
Wed Sep 8 03:45:36 MDT 2021
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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>> Best--Michael
>>
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>> --
>>
>> Best--Michael
>>
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