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Author Topic: Unsprung weight  (Read 4848 times)

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Offline fabr

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Unsprung weight
« on: February 13, 2009, 06:10:15 AM »
Time for a discussion of unsprung weight and the effects of it . Who wants to start?
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Offline Boostinjdm

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Re: Unsprung weight
« Reply #1 on: February 13, 2009, 06:20:47 AM »
You just did...
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Offline fabr

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Re: Unsprung weight
« Reply #2 on: February 13, 2009, 07:00:10 AM »
No,I started the topic ;D  but here goes.
   First off, let's start with a definition of what unsprung weight is.  Unsprung weight is anything that is not supported by the suspension system.In other words the entire weight of the tire/wheel/brake rotor/brake disc/wheel bearings/seals/bearing races/etc.,anything in general that is connected to a suspension member. It is also a generally accepted principle that all suspension links(trailing arms/a arms/shocks etc..) are calculated at 1/2 their weight(1/2 unsprung and 1/2 sprung).
   
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline fastcorvairs

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Re: Unsprung weight
« Reply #3 on: February 13, 2009, 07:11:19 AM »
Ummmmmmmmmmmmmmmm!!!!!!!!! gg: gg:
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Offline fabr

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Re: Unsprung weight
« Reply #4 on: February 13, 2009, 07:15:15 AM »
Ummmm what? Comments?
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline fastcorvairs

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Re: Unsprung weight
« Reply #5 on: February 13, 2009, 07:17:59 AM »
Quote from: Masterfabr on February 13, 2009, 07:15:15 AM
Ummmm what? Comments?

Just ah wait-en to see what shake's outta du trees on this one.
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Offline Carlriddle

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Re: Unsprung weight
« Reply #6 on: February 13, 2009, 07:29:30 AM »
Less is better? :-X

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Offline Nutz4sand

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Re: Unsprung weight
« Reply #7 on: February 13, 2009, 10:21:56 AM »
I have heard that for every 10 pounds of unsprung weight you can shed its like loosing 100 pounds of sprung weight.

(Also heard its even better if its rotating mass)

This was applied to full size racecars but does it apply to Minis as well? I would assume so but you know how that words spelled. 
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Offline fabr

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Re: Unsprung weight
« Reply #8 on: February 13, 2009, 10:56:05 AM »
It all applies the same.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Carlriddle

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Re: Unsprung weight
« Reply #9 on: February 13, 2009, 11:00:36 AM »
What the easiest way to measure?  Frame on stands shocks off and see how much each wheel weighs on scale divide in half(roughly)??
« Last Edit: February 13, 2009, 11:31:23 AM by Carlriddle »
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Offline fabr

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Re: Unsprung weight
« Reply #10 on: February 13, 2009, 11:05:49 AM »
IMO ,it is a goal to achieve as little unsprung weight as possible while maintaining adequate strength. It will make for a better handling car more capable of keeping the tire in contact with the ground. Unsprung weight is not a place to just throw mass into to get needed strength.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline fabr

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Re: Unsprung weight
« Reply #11 on: February 13, 2009, 11:10:28 AM »
Quote from: Carlriddle on February 13, 2009, 11:00:36 AM
What the easiest way to measure?  Frame on stands shocks off and see how much each wheel weighs on scale divide in half(roughly)??
No, frame on stand,shock off,place scale centered under tire/wheel assembly with suspension at mid travel,weigh.There's your true unsprung weight.Add the weight of the shock shaft and you pretty much have it perfect.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Carlriddle

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Re: Unsprung weight
« Reply #12 on: February 13, 2009, 11:26:15 AM »
I forgot the shocks.  I know my rear tire are heavy.  The less rotational mass the quicker the motor will spin thru the RPM range.
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Offline fabr

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Re: Unsprung weight
« Reply #13 on: February 13, 2009, 11:27:09 AM »
Don't divide in half though  with this method.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Engineer

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Re: Unsprung weight
« Reply #14 on: February 13, 2009, 11:35:51 AM »
Get your scales out and post up some numbers......  I need some design criteria, to meet or exceed, actually this is scored like golf low number = better.  ;D

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