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Re: Drive shaft ---- Aluminum VS Chrome Moly
[Re: blown572dart]
#919561
02/03/11 12:06 AM
02/03/11 12:06 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
We run a 4" with 1480 joints from Bickel.
A 4" what? 
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Re: Drive shaft ---- Aluminum VS Chrome Moly
[Re: ]
#919562
02/03/11 12:35 AM
02/03/11 12:35 AM
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Joined: Mar 2006
Posts: 5,067
Orlando Florida
blown572dart
master
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master
Joined: Mar 2006
Posts: 5,067
Orlando Florida
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Quote:
Quote:
We run a 4" with 1480 joints from Bickel.
A 4" what?
Chromoly (sorry) 
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Re: Drive shaft ---- Aluminum VS Chrome Moly
[Re: blown572dart]
#919563
02/03/11 01:02 AM
02/03/11 01:02 AM
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Joined: Jan 2003
Posts: 4,292
Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,292
Morrow, OH
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I have a long shaft and make around 800 hp. I was really close to critical speed with the quoted chrome moly shaft, and Mark Williams talked me into a mild steel 4 inch. I used to pass through a critical speed with the 3 1/2 inch shaft, but the 4 inch is nice and smooth through the whole range, and that was up to 7400 rpm at one time.
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
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Re: Drive shaft ---- Aluminum VS Chrome Moly
[Re: Super Scamp]
#919565
02/03/11 10:43 AM
02/03/11 10:43 AM
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Joined: Jan 2003
Posts: 642
New Jersey
Craig
mopar
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mopar
Joined: Jan 2003
Posts: 642
New Jersey
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One other thing to consider is damage resistance - if you accidentally hit it with a tool or jackstand, chrome moly won't be affected, but aluminum or carbon fiber may get nicked and then fail at that point.
67 Dart, 426 Hemi, 9.23/145mph, 3400lbs, footbraked, owned since 1982
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Re: Drive shaft ---- Aluminum VS Chrome Moly
[Re: Craig]
#919566
02/03/11 10:55 AM
02/03/11 10:55 AM
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Joined: Jul 2009
Posts: 694
Michigan
Super Scamp
OP
mopar
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OP
mopar
Joined: Jul 2009
Posts: 694
Michigan
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It's good to hear from all the members that are running above 800hp with different shafts installed in their Mopars. Good information and correct information is hard to come by these days. Thanks
Dyno Tech has built my Alum. 3 1/2 with 1350 joints I have billet front and rear yokes. I should be ok to launch the beast this spring.
Just One Man's Opinion
Mopar Mafia Racing
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Re: Drive shaft ---- Aluminum VS Chrome Moly
[Re: bill_greenwood]
#919567
02/03/11 11:08 AM
02/03/11 11:08 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Not to hijack this, but what kind of ET gains are likely to be seen when going from a stock-style drive shaft to a CM or alum. one? The one behind my little torque-challenged small block is the stock one with the 9" u-joint added.
I dont think you will see any change... I went moly from
day one so I dont have any comparison... but my way
of thinking is if you go alum you need to add diameter
to get the strength but you also loose a few pounds
but you also move the weight farther out from centerline
so I believe thats a wash... JMO.... rule of thumb
is you need 2X the wall thickness over steel to be
the same strength... but if you increase diameter
it add strength... but again you move the weight
outward which is harder to turn(accelerate)... I'm
sure when its all said and done its all a wash
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Re: Drive shaft ---- Aluminum VS Chrome Moly
[Re: 440Jim]
#919568
02/03/11 11:14 AM
02/03/11 11:14 AM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
Quote:
That sounds backwards - aluminum stays stretched (rods), steel relaxes back.
Wall thickness and diameter are the design parameters for torque. If designed to stay under the fatique limit, the steel will have unlimited life. Aluminum has no fatique limit, it will always fatigue at any stress; it is just a matter of time.
I agree completely. We use a steel shaft on our 3000 HP combination. We used a carbon fiber unit with our 2000 HP nitrous deal.
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