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Re: $20 drive shaft loop no drilling required
[Re: RobX4406]
#1209983
04/06/12 01:20 PM
04/06/12 01:20 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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I do like the idea of getting the inside nuts protruding on the inside out of the equation. I would agree the loop mentioned is better then nothing, just not by much. I am puzzled by those who are so adverse to drill a couple of holes, but have little worry about how much damage a DS can do with a combined 12"? overhanging/swinging yoke and u-joint at say 100 mph just under your seat. The rotating twisted mess will rip those arms off in less then a second (6000 rpms, thats 100rpms/hits). The design is IMO "very lacking" (edited) and may only serve the purpose of passing tech. Even the other guys hanging crossmember safety loop is as per designer NOT for competition use, and I give him  for admitting that. 
Last edited by jcc; 04/06/12 02:09 PM.
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Re: $20 drive shaft loop no drilling required
[Re: jcc]
#1209984
04/06/12 03:26 PM
04/06/12 03:26 PM
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Joined: Oct 2007
Posts: 485
Raleigh, NC
j.mcconnell
mopar
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mopar
Joined: Oct 2007
Posts: 485
Raleigh, NC
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Quote:
combined 12"? overhanging/swinging yoke and u-joint at say 100 mph just under your seat. The rotating twisted mess will rip those arms off in less then a second (6000 rpms, thats 100rpms/hits).
Don't most u-joints are going to break at the initial hit, not at speed? I guess you could damage it and have it hold on for a while.
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Re: $20 drive shaft loop no drilling required
[Re: jcc]
#1209990
04/07/12 08:32 AM
04/07/12 08:32 AM
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Joined: Jan 2003
Posts: 3,575
The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Quote:
Don't most u-joints are going to break at the initial hit, not at speed? I guess you could damage it and have it hold on for a while.
Not all of them.
Many years ago I had a U-joint come apart just when I let off the throttle during a long overtaking action at the highway at a 'good rate of speed' (read: 100-110mph)...
The U-joint 'failure' could be traced back to my own stupid installation fault at the time, but luckily the driveshaft didn't entirely break loose from the transmission. The final result was a wrecked transmission with bend outputshaft and a carbottom covered in ATF.
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Re: $20 drive shaft loop no drilling required
[Re: BigBlockMopar]
#1209991
04/07/12 09:55 AM
04/07/12 09:55 AM
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Joined: Mar 2006
Posts: 9,835
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,835
MI, usa
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First off I've had 4 U joints break at speed . The 1st was on my 4 speed Challenger power shifting 3rd. It broke the bell housing off the block from vibration due to losing a cap. However the joint did not break and the shaft stayed in the car with no floor damage.The 2nd was at Budds Creak at the end of a 130 MPH pass. The front cap broke,not the joint. It broke the tail shaft. Shaft stayed in the car with no damage. The 3rd was driver error . He put my LBA valve body in 1st gear at 100+. It ripped the U-joint straps of the rear axle,so the shaft flung around pretty good.. The loop did its job,bent the mufflers some. I was able to get the shaft rebalanced at Dyno-tech. The 4th, a buddy driving his 66 Coronet down the X-way with no loop. The front joint broke. Ruined the shaft,came through the floor,broke the console,broke the tail shaft housing. But the best was the fact that most of the damage came from the output shaft of the 727 being bent at a 15 degree angle. As you can see from my experiences you never know the amount of damage. The damage could be to yourself. This is why I always plate the floor where the loop bolts.
Doug
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Re: $20 drive shaft loop no drilling required
[Re: sshemi]
#1209992
04/07/12 10:23 AM
04/07/12 10:23 AM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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Quote:
My english is not good enough to explain why the loop doesnt need to be super strong. If the shaft breaks and is kept close to centerline it wont do much damage, if that makes any sence
Your communication skills are fine, but what many seem to overlook is not all DS failures are front u joint, they can be the rear joint, can be the front yoke, can be the DS itself, and can happen at any speed, since higher speeds cause greater runout, increasing chance of DS failure. If the failed DS was pristine and perfectly balanced, containing it inside a small perfect circle would be no big deal, but we are usually talking about a hugely unbalanced twisted 5'? long flexible tube, inside an oval, powered by a 3,000lb car accelerated by a 3-4:1 rear end, for hundreds of revolutions, and the mass is constantly increasing in diameter each revolution, extremely multiplying the forces. Hanging 200lbs on it as a test is like checking your timing with a wet finger.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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a ujoint can let go anytime & anywhere. i have mine bolted to the floor boards with plates. don't think it's going anywhere. cheap is the wrong way to on safety or ur car.
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