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Old 09-23-2012, 02:45 PM   #21
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Default Re: H-D Flywheels for sidehack question

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Originally Posted by old.wrench View Post
Tungsten is only slightly less dense than DU. If you can't get your hands on some DU, tungsten might serve your purpose.
It might be healthier too, old.wrench!

The only 'pure' tungsten I am familar with is wire.
I must wait until this evening to browse and search, if my wife lets me on her broadband.

...Cotten
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Old 09-23-2012, 02:52 PM   #22
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Default Re: H-D Flywheels for sidehack question

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Originally Posted by Dragstews View Post
Could add weight to the clutch drum for more inertia ....
Dragstews!

I wish to avoid parasitic inertia, of course.

....Cotten
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Old 09-23-2012, 03:05 PM   #23
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Default Re: H-D Flywheels for sidehack question

You can buy the copper tungsten rounds we use, in several different alloys from McMaster Carr.

This is the one we use most frequently:

http://www.mcmaster.com/#tungsten-rods/=jf5cxb

We have a customer that we machine electrodes for, using the copper tungsten pretty regularly. It's density is even higher at .61 lbs per cubic inch and has the added feature of being machinable.

In the example I gave above of drilling the holes radially, it would be about $400 worth of copper tungsten.

Regarding your balance, anything you do to change the rotating weight and location of that weight is going to have an effect on your existing balance.
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Old 09-23-2012, 03:12 PM   #24
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Default Re: H-D Flywheels for sidehack question

As long as it appears you'll go to any limits to acheive your goal, how about maching a VEE in each flywheel and shrink a steel band on the flywheel (accounting for O. D. of course) and Fill this void with mercury? Would also create a viscous dampening affect. Don't have a periodic table in front of me, but pretty sure mercury is heavier than steel by quite a bit.
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Old 09-23-2012, 03:14 PM   #25
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Default Re: H-D Flywheels for sidehack question

[QUOTE=FearNoEvo;851344]


PPS: Dragstews!

No way in Hell I would fall for Balancemasters.

Not saying to use Balancemasters....

The link that I posted was to show how they did the install of mercury ....
May give you ideas.......

Last edited by Dragstews; 09-23-2012 at 03:42 PM.
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Old 09-23-2012, 03:29 PM   #26
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Default Re: H-D Flywheels for sidehack question

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FearNoEvo!

I hope to browse that tonight, even though the cost is prohibitive.

But as far as balancing,
aside from minor additions and subtractions from my mounting bolts, which would be easily corrected after the fact if necessary,
adding a concentric weight only adds total mass, and will have no effect upon the existing factor.
I love threads like this. Thank you.

Here are a couple of great reads on the effect of the addition of weight and the impact of its location.

http://hpwizard.com/rotational-inertia.html

http://www.acs.psu.edu/drussell/bats/bat-moi.html
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Old 09-23-2012, 03:57 PM   #27
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Default Re: H-D Flywheels for sidehack question

Great links FearNoEvo!

The first looks like it has a calculator tool that will be important.
It will take a while to digest them...

Which is why I am trying to keep this simple.
No doubt an "ideal" factor may not be 60. An ideal factor is a myth, anyway.
I just want to add mass in a practical manner.

Then it can be removed in a practical manner.

Balancing is "forgiving", obviously.
I would never sweat a couple of percent anyway.

....Cotten
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Old 09-23-2012, 06:40 PM   #28
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Default Re: H-D Flywheels for sidehack question

I've never machined tungsten, but keep in mind it's radioactive (low) and very.brittle. Not to mention expensive. There are also some tungsten composites that supposedly machine like cast iron. Could not find any info on its weight. Clutches might be cheaper to replace, depending on the mileage you do.
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Last edited by MeanMike; 09-23-2012 at 06:58 PM.
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Old 09-23-2012, 07:01 PM   #29
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Default Re: H-D Flywheels for sidehack question

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I've never machined tungsten, but keep in mind it's radioactive (low) and very.brittle. Not to mention expensive. There are also some tungsten composites that supposedly machine like cast iron. Could not find any info on its weight. Clutches might be cheaper to replace, depending on the mileage you do.
Mallory Metal is a tungsten alloy that you can machine.
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Old 09-23-2012, 07:35 PM   #30
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Default Re: H-D Flywheels for sidehack question

fab a weight to add to your motor sprocket and if that is not enough add weight to the clutch basket you won't even have to break the motor.
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Old 09-23-2012, 07:42 PM   #31
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Default Re: H-D Flywheels for sidehack question

maybe drill and tap the side of your flywheels and bolt some sttel plate to the sides of them. drilling them out the same distance and depth plus machining the steel plates to have the same weight should save you on rebalancing. no?
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Old 09-23-2012, 10:07 PM   #32
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Default Re: H-D Flywheels for sidehack question

Quote:
maybe drill and tap the side of your flywheels and bolt some sttel plate to the sides of them. drilling them out the same distance and depth plus machining the steel plates to have the same weight should save you on rebalancing. no?
Have you even read the thread??
Just askin'
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Old 09-24-2012, 02:54 AM   #33
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Default Re: H-D Flywheels for sidehack question

S+S cases?? what kindve motor/bike/sidecar is this??
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Old 09-24-2012, 03:43 AM   #34
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Default Re: H-D Flywheels for sidehack question

I also was going to suggest Mallory metal . Done by drilling then reaming axial holes in the flywheels then fitting in the mallory metal (interference fit) .Balance the whole crank ,rod & piston assembly.Again material cost plus labour/ machining cost might not an ecconomical option. Worth checking out though.
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Quote:
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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 09-24-2012, 08:04 AM   #35
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Default Re: H-D Flywheels for sidehack question

Folks,

"Mallory Metal" and other heavies for automotive crank balancing does not come in 8.5" rounds, nor 1/2"+ plate, from my industry suppliers, anyway.
(I have "plugged and stuffed" my share of both auto and v-twin cranks in the past.)
Why take these flywheels on a one-way trip if it is not necessary?

Joe49!

Adding to the motorsprocket may come later,
but please understand that it lacks the diameter to give its mass much "torque-storing" ability.

Friday!

'65 FL cases in a stock chassis, with multiple sidehack appliances (see attachment).

jbfrmca!

Wish I had thought of that.

....Cotten
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Old 09-24-2012, 11:50 AM   #36
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Default Re: H-D Flywheels for sidehack question

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Originally Posted by FearNoEvo View Post
..Regarding your balance, anything you do to change the rotating weight and location of that weight is going to have an effect on your existing balance.
Sorry about my previous misquote that somehow turned into a Dragstews quote, it had to be my fault, but...

FearNoEvil!

"anything you do to change the rotating weight and location of that weight is going to have an effect on your existing balance" is only half-true.

You can add a ton as long it does not change location of the "balanced" countermass.
An added concentric mass changes the factor none at all, if carefully applied.

But I'm not sold on 60%, Folks.

So, if my bolt on disc has an eccentricity of mass, from a drilled extra hole perhaps, then indexing it to different positions will give a different factor, correct?
If I have five positions, then I have five factors to choose from.

....Cotten
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Old 09-24-2012, 12:37 PM   #37
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Default Re: H-D Flywheels for sidehack question

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

.....Cotten
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