[Healeys] Lightened flywheels

Bluehealey bluehealey at gmail.com
Wed Sep 8 02:13:49 MDT 2021 

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> 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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