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Old 09-22-2012, 04:18 PM   #1
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Default H-D Flywheels for sidehack question

Seriously Folks,

This is the only forum where I can bring this question up.

As a sidehacker, I need 'stored torque'.
In other words, heavy flywheels. Very heavy.

My S&S 4.5" wheels are far too light.
Some of you may not understand, but they are not worth burning up clutches.

T&O's are fantastic, and I have assembled my share.
But I already spent my money on these S&Ss (somewhere around 1975). And perhaps I desire more mass than even T&Os....

Machining a ring to add mass to the S&S wheels shouldn't be much of a problem, since there is plenty of room in the cases.

So here is my question:

Where can I get a piece of depleted uranium to carve a ring from?

Just askin.

Thanks in advance,

....Cotten
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Old 09-22-2012, 04:34 PM   #2
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Default Re: H-D Flywheels for sidehack question

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Where can I get a piece of depleted uranium to carve a ring from?
....Cotten
A.Q.Khan??

Might be a bit dangerous to ask, however...

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Old 09-22-2012, 04:51 PM   #3
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Default Re: H-D Flywheels for sidehack question

try to hook up with an aircraft maintenance man
they will have materials like that

also strange kinds of strong alu that wheigh more than you would suspect
probl. better to make a ring out of that ....?!!
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Old 09-22-2012, 06:10 PM   #4
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Default Re: H-D Flywheels for sidehack question

Tungsten carbide, it isn't cheap, and is heavy as heck with almost twice the density of steel, .32 lbs/ cubic inch vs .54 lbs per cubic inch
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Old 09-22-2012, 07:00 PM   #5
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Default Re: H-D Flywheels for sidehack question

Try the stuff that has replaced lead in Duck shot, not the steel shot, it is allmost as heavy as lead......Roach.
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Old 09-22-2012, 07:01 PM   #6
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Default Re: H-D Flywheels for sidehack question

Cotten, if you're really serious about adding mass, forget about the depleted uranium and just drill a few black holes in the flywheels instead.
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Old 09-23-2012, 08:44 AM   #7
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Default Re: H-D Flywheels for sidehack question

I guess this was not the forum to ask upon, after all.

.....Cotten
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Old 09-23-2012, 08:48 AM   #8
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Default Re: H-D Flywheels for sidehack question

What about Tungsten?

I know it's pretty dense and heavy but I don't know enough about it to talk sensibly.
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Old 09-23-2012, 09:42 AM   #9
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Default Re: H-D Flywheels for sidehack question

Car guys use Mallory metal , which I think is tungsten, to add weight to balance cranks. http://www.race-mart.com/Heavy-Mallo...al_c_8041.html
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Old 09-23-2012, 09:44 AM   #10
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Default Re: H-D Flywheels for sidehack question

Cotten,
Most of the "hot rod" guys around here use Mallory Metal to add weight to flywheels when they change them from external to internal balancing, so you might check that.
The thing is, you're gonna pay more for any heavy metal than a new set of T & O flywheels would cost. Then you have your labor making everything work. Definately not the economical way to go, but I guess if the point is "look what I did" it might be worth it.
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Old 09-23-2012, 12:27 PM   #11
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Default Re: H-D Flywheels for sidehack question

Quote:
Originally Posted by Cotten View Post
I guess this was not the forum to ask upon, after all.

.....Cotten
why ??
because the answer you wanted to hear didn't came

lots of great tips here to look into

or just buy different flywheels ...its just that simple
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Old 09-23-2012, 02:02 PM   #12
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Default Re: H-D Flywheels for sidehack question

Folks,

None of your suggestions are available in a 8.5" disc a half-inch thick.
(I have found no 'aluminum' of density even equal to cast iron.)

I already explained in my first post that I want more than T&Os.

There has to be some decommissioned armor somewhere in reach.

....Cotten
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Old 09-23-2012, 02:35 PM   #13
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Default Re: H-D Flywheels for sidehack question

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Folks,

None of your suggestions are available in a 8.5" disc a half-inch thick.
(I have found no 'aluminum' of density even equal to cast iron.)

I already explained in my first post that I want more than T&Os.

There has to be some decommissioned armor somewhere in reach.

....Cotten
i hope to speak with this guy i know ,who is the head maintenance engineer over at KLM
they have big lumps of alu who are being used to made aircraft wheels ,engine parts ,pump and hydrolic parts for huge airplaines

sometimes he brings leftovers to our shop and there is a friend of us who made a custom set of engine cases and flywheels out of this material for a dragracer that he is racing for over two years now

if its suitable for a 747 and dragracing flywheels ...why shouldn't it work for your flywheels ...

i'm sure he can give me the name for this kind of aluminium they are using
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Old 09-23-2012, 02:59 PM   #14
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Default Re: H-D Flywheels for sidehack question

Aluminum as racing flywheels, is used for the purpose of reducing rotating weight. There is no aluminum that matches the density of steel. 2021 is a very common aluminum alloy for aircraft

Re my suggestion to use tungsten, I meant in the way it is used for balancing, drill holes radially around your flywheels and install tungsten plugs.

For instance, if you drilled 20 half inch holes at a half inch deep, radially around your flywheels, both pieces, you would be removing approximately 1.25 pounds of rotating weight from the wheels. Now if you fill those holes back up with tungsten carbide, you would be adding back about 2.12 lbs. A net gain of about a pound of rotating weight.

Double the hole depth, double the increase.

Also, keeping the weight as far from rotational center line as possible, serves to further increase the gain from the added rotating weight by effectively increasing the length of the lever that the weight is applying to the fulcrum.

Last edited by FearNoEvo; 09-23-2012 at 03:07 PM.
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Old 09-23-2012, 03:04 PM   #15
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Default Re: H-D Flywheels for sidehack question

El Diablo and Folks,

Please understand that I am not trying to re-invent flywheels;
I am trying to fix some S&Ss that are perfect in every way, except far too puny: "Dragracing flywheels" is exactly the opposite of what a sidehack needs.

Doncha all know that?
You do now.

I must add material of extreme density and mass.
Once again, I would be surprised to find any aluminum that even approaches the common malleable cast steel in stock wheels, or even brass.
"Leadalloy" used to be a recognized material that may be the best I can do.

Turning a section from a junk wheel is of course an option,
but it would at best only bring it up to stock or T&O specs.

Sidehacks enjoy flymass, and I want as much as I can possibly bolt on.

....Cotten
Late edit:
Fearnoevo!
The crank is blueprinted, balanced (60%), and trued already.
I only intend to drill and tap it for 1/4-20 countersunk bolts to hold on the additional mass.
I cannot see spending for anything that does not exceed the density of common materials

Last edited by Cotten; 09-23-2012 at 03:11 PM.
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Old 09-23-2012, 03:05 PM   #16
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Default Re: H-D Flywheels for sidehack question

[email protected] try these guys cotton. All I'm saying is that I think we may have to wait a few more years before depleted uranium starts showing up in dumpsters
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Old 09-23-2012, 03:13 PM   #17
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Default Re: H-D Flywheels for sidehack question

Cotten, what diameter and thickness are the flywheels? I can tell you exactly how much weight you could hope to add, if I can draw it up quick.
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Old 09-23-2012, 03:21 PM   #18
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Default Re: H-D Flywheels for sidehack question

Tungsten is only slightly less dense than DU. If you can't get your hands on some DU, tungsten might serve your purpose.
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Old 09-23-2012, 03:41 PM   #19
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Default Re: H-D Flywheels for sidehack question

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Tungsten is only slightly less dense than DU. If you can't get your hands on some DU, tungsten might serve your purpose.
Sounds like he has his heart set on Unobtainium and nothing else will do.
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Old 09-23-2012, 03:44 PM   #20
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Default Re: H-D Flywheels for sidehack question

I think you should build an add on external flywheel along the lines of a bacon slicer Moto-Guzzi single myself!
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