Lightweight aluminum driveshaft
Record Breaker
Joined: Aug 2005
Posts: 1,196
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From: St.Clair, MI
RE: Lightweight aluminum driveshaft
stock actually wasnt that heavy when i changed my u-joints i was actually able to get it up there myself, we took it down and i was getting ready to be crushed by a big peice of metal when i got it out i was like hmm not bad, lighter than a bag of dog food i think iirc.. anyways never heard of there being an aft. mkt. dshaft, just make sure its balanced properly and it should be just fine, if anything build the motor up i think the stock driveshaft is prly your best bet. but dont take my word for it wait for someone who knows what there talking about if u want.
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Champion
Joined: Nov 2006
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RE: Lightweight aluminum driveshaft
ORIGINAL: Ram_Sport
stock actually wasnt that heavy when i changed my u-joints i was actually able to get it up there myself, we took it down and i was getting ready to be crushed by a big peice of metal when i got it out i was like hmm not bad, lighter than a bag of dog food i think iirc.. anyways never heard of there being an aft. mkt. dshaft, just make sure its balanced properly and it should be just fine, if anything build the motor up i think the stock driveshaft is prly your best bet. but dont take my word for it wait for someone who knows what there talking about if u want.
stock actually wasnt that heavy when i changed my u-joints i was actually able to get it up there myself, we took it down and i was getting ready to be crushed by a big peice of metal when i got it out i was like hmm not bad, lighter than a bag of dog food i think iirc.. anyways never heard of there being an aft. mkt. dshaft, just make sure its balanced properly and it should be just fine, if anything build the motor up i think the stock driveshaft is prly your best bet. but dont take my word for it wait for someone who knows what there talking about if u want.
Record Breaker
Joined: Nov 2005
Posts: 1,827
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From: Ontario Canada
RE: Lightweight aluminum driveshaft
The formula is
100lbs of static = .1 off ets (1/4m)
25lbs rotating = .1 off ets
This formula does not come into effect untill the vehicle is under 4000lbs (w/driver) and running ets of 13.0 or better.
I have a 60lb wt loss going from stock Indy rims w/GYE GTIIs to Weld draglite rims and ET streets (fronts 68lbs). Final ratio increases to 418 from 392 as well as traction increases greatly. According to your formula I would be looking at about .75 second et reduction when in fact I would see .25-.3 off ets. (when NA/ mild 360)
100lbs of static = .1 off ets (1/4m)
25lbs rotating = .1 off ets
This formula does not come into effect untill the vehicle is under 4000lbs (w/driver) and running ets of 13.0 or better.
I have a 60lb wt loss going from stock Indy rims w/GYE GTIIs to Weld draglite rims and ET streets (fronts 68lbs). Final ratio increases to 418 from 392 as well as traction increases greatly. According to your formula I would be looking at about .75 second et reduction when in fact I would see .25-.3 off ets. (when NA/ mild 360)
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Joined: May 2005
Posts: 3,549
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From: Wyckoff, NJ
RE: Lightweight aluminum driveshaft
the driveshaft is actually really light. its just the balancer on the end that adds all the weight, its very thin, i wish it was thicker, i guy on pavementsucks lightly hit it on a rock and it ripped it in half like cutting a soda can with a razor knife. if your looking for weight reduction i would start else were
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Champion
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RE: Lightweight aluminum driveshaft
ORIGINAL: RM_Indy
The formula is
100lbs of static = .1 off ets (1/4m)
25lbs rotating = .1 off ets
This formula does not come into effect untill the vehicle is under 4000lbs (w/driver) and running ets of 13.0 or better.
I have a 60lb wt loss going from stock Indy rims w/GYE GTIIs to Weld draglite rims and ET streets (fronts 68lbs). Final ratio increases to 418 from 392 as well as traction increases greatly. According to your formula I would be looking at about .75 second et reduction when in fact I would see .25-.3 off ets. (when NA/ mild 360)
The formula is
100lbs of static = .1 off ets (1/4m)
25lbs rotating = .1 off ets
This formula does not come into effect untill the vehicle is under 4000lbs (w/driver) and running ets of 13.0 or better.
I have a 60lb wt loss going from stock Indy rims w/GYE GTIIs to Weld draglite rims and ET streets (fronts 68lbs). Final ratio increases to 418 from 392 as well as traction increases greatly. According to your formula I would be looking at about .75 second et reduction when in fact I would see .25-.3 off ets. (when NA/ mild 360)
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Joined: Aug 2005
Posts: 3,313
Likes: 8
RE: Lightweight aluminum driveshaft
While it is a great idea to consider weight reduction for both acceleration and fuel economy...keep in mind that for acceleration it
NOT REALLY WEIGHT
of driveshafts, wheels, tires, internal transmission parts.
What slows acceleration is a more complicated thing called:
"Moment of Rotational Inertia"
Engineers and Scientists use the letters
Iw
to refer to this.
Different driveshaft designs (or wheels)
can weigh exactly the same on your bathroom scale...but on your vehicle they will slow it down differently.
It is the placement of the weight away from the center of rotation that counts.
Bicycle racers sometimes measure this themselves. You can hang a wheel from a thin metal rod (also known as a torsion bar)
Then you twist the wheel against the springy-ness of the rod it is hanging from and let it rock back and forth...kinda like the insides of an old fashioned mechanical wristwatch.
By timing the back and forth rocking with a stopwatch you can measure the Iw of that rotating part.
Lower Iw is good.
Volunteers have written a description on Wikipedia that is better than mine above:
http://en.wikipedia.org/wiki/Rotational_inertia
You might be interested that scientists know that Einsteins theory of 'big things' like planet movement has something wrong with it, and the other theory of tiny things called 'Quantum Theory' also has something wrong with it.
In searching for a 'unified theory' that would correct both, scientists so far have found that the laws of 'Inertia' and 'Momentum' seem to still be correct in all cases, and these big thinkers are counting on Conservation of Momentum to be the 'foundation' of some new theory.
NOT REALLY WEIGHT
of driveshafts, wheels, tires, internal transmission parts.
What slows acceleration is a more complicated thing called:
"Moment of Rotational Inertia"
Engineers and Scientists use the letters
Iw
to refer to this.
Different driveshaft designs (or wheels)
can weigh exactly the same on your bathroom scale...but on your vehicle they will slow it down differently.
It is the placement of the weight away from the center of rotation that counts.
Bicycle racers sometimes measure this themselves. You can hang a wheel from a thin metal rod (also known as a torsion bar)
Then you twist the wheel against the springy-ness of the rod it is hanging from and let it rock back and forth...kinda like the insides of an old fashioned mechanical wristwatch.
By timing the back and forth rocking with a stopwatch you can measure the Iw of that rotating part.
Lower Iw is good.
Volunteers have written a description on Wikipedia that is better than mine above:
http://en.wikipedia.org/wiki/Rotational_inertia
You might be interested that scientists know that Einsteins theory of 'big things' like planet movement has something wrong with it, and the other theory of tiny things called 'Quantum Theory' also has something wrong with it.
In searching for a 'unified theory' that would correct both, scientists so far have found that the laws of 'Inertia' and 'Momentum' seem to still be correct in all cases, and these big thinkers are counting on Conservation of Momentum to be the 'foundation' of some new theory.
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Champion
Joined: Nov 2006
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From:
RE: Lightweight aluminum driveshaft
ORIGINAL: HankL
While it is a great idea to consider weight reduction for both acceleration and fuel economy...keep in mind that for acceleration it
NOT REALLY WEIGHT
of driveshafts, wheels, tires, internal transmission parts.
What slows acceleration is a more complicated thing called:
"Moment of Rotational Inertia"
Engineers and Scientists use the letters
Iw
to refer to this.
Different driveshaft designs (or wheels)
can weigh exactly the same on your bathroom scale...but on your vehicle they will slow it down differently.
It is the placement of the weight away from the center of rotation that counts.
Bicycle racers sometimes measure this themselves. You can hang a wheel from a thin metal rod (also known as a torsion bar)
Then you twist the wheel against the springy-ness of the rod it is hanging from and let it rock back and forth...kinda like the insides of an old fashioned mechanical wristwatch.
By timing the back and forth rocking with a stopwatch you can measure the Iw of that rotating part.
Lower Iw is good.
Volunteers have written a description on Wikipedia that is better than mine above:
http://en.wikipedia.org/wiki/Rotational_inertia
You might be interested that scientists know that Einsteins theory of 'big things' like planet movement has something wrong with it, and the other theory of tiny things called 'Quantum Theory' also has something wrong with it.
In searching for a 'unified theory' that would correct both, scientists so far have found that the laws of 'Inertia' and 'Momentum' seem to still be correct in all cases, and these big thinkers are counting on Conservation of Momentum to be the 'foundation' of some new theory.
While it is a great idea to consider weight reduction for both acceleration and fuel economy...keep in mind that for acceleration it
NOT REALLY WEIGHT
of driveshafts, wheels, tires, internal transmission parts.
What slows acceleration is a more complicated thing called:
"Moment of Rotational Inertia"
Engineers and Scientists use the letters
Iw
to refer to this.
Different driveshaft designs (or wheels)
can weigh exactly the same on your bathroom scale...but on your vehicle they will slow it down differently.
It is the placement of the weight away from the center of rotation that counts.
Bicycle racers sometimes measure this themselves. You can hang a wheel from a thin metal rod (also known as a torsion bar)
Then you twist the wheel against the springy-ness of the rod it is hanging from and let it rock back and forth...kinda like the insides of an old fashioned mechanical wristwatch.
By timing the back and forth rocking with a stopwatch you can measure the Iw of that rotating part.
Lower Iw is good.
Volunteers have written a description on Wikipedia that is better than mine above:
http://en.wikipedia.org/wiki/Rotational_inertia
You might be interested that scientists know that Einsteins theory of 'big things' like planet movement has something wrong with it, and the other theory of tiny things called 'Quantum Theory' also has something wrong with it.
In searching for a 'unified theory' that would correct both, scientists so far have found that the laws of 'Inertia' and 'Momentum' seem to still be correct in all cases, and these big thinkers are counting on Conservation of Momentum to be the 'foundation' of some new theory.