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Old 01-21-2014, 11:58 AM
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Default Driveshaft Safety Loop Q's

Does it matter where the driveshaft safety loop is placed in relation to where the exhaust crossover pipe (h-pipe/x-pipe) is located?

Is anyone running a loop that attaches to the transmission mount. I don't want to bolt it to the floor boards. The only other option seems to be to use the subframe connector bolts and do a fair amount of fabrication (for an amatuer at best welder). This is for a '67 Camaro.

I haven't drag raced it yet, and I'm not on slicks, so I don't "need" a loop, but the rear end and driveshaft are out right now, so I figured it was a good weekend project to keep me out of trouble.
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Old 01-29-2014, 03:38 PM
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I think "typical" location is 3/4 toward the rear of the shaft, I imagine to catch it if it breaks at the rear axle. A friend broke the joints at the front of his driveline at 120+, that made a mess of his floor and his underpants!


Dan
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Old 01-29-2014, 05:51 PM
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I would mount it to tword the front of the DS. I'd rather have the rear of the DS hit the ground then the front.. NHRA rules say 6" back from the transmision
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Old 01-29-2014, 06:08 PM
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Thanks guys, I don't think I was very clear. I know the safety loop needs to be within 6" of the centerline on the front U-joint.

My question was whether there was a rule about where the H-pipe or X-pipe falls in relation to the loop (i.e. does it have to be in front of the loop or behind it, or does it not matter?)
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Old 01-29-2014, 06:12 PM
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Most rule books specify the DS loop be located no more than 6" behind the front U-joint. If you happen to have sub frame connectors installed that is a good place to mount a DS loop. There is no rule pertaining to the exhaust that I have ever seen.
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Last edited by TheJDMan; 01-29-2014 at 06:25 PM.
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Old 01-29-2014, 06:32 PM
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Quote:
Originally Posted by TheJDMan View Post
Most rule books specify the DS loop be located no more than 6" behind the front U-joint. If you happen to have sub frame connectors installed that is a good place to mount a DS loop. There is no rule pertaining to the exhaust that I have ever seen.
I think Mythbusters did an episode on the pole vault theory and couldn't make it happen.

I posted a similar question on TC and got the same answer that it didn't matter where the pipe went.

Here's the thread that I was referencing:http://www.camaros.net/forums/showthread.php?t=193442

They mention that the X-pipe has to go behind the safety loop. But in reading it again, maybe they meant it was the only place it would fit, rather than that it was a requirement.
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Old 01-29-2014, 06:36 PM
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Here are the quotes:

Quote:
With a driveshaft loop you are pretty limited, the X has to go behind the safety loop.
And
Quote:
The NHRA required driveshaft safety loop has to be within a few inches of the front U-joint. I wish I had a photo of mine to show.
I like the DR. Gas X setup, all these others are copies.
The X has to go behind the safety loop.

Last edited by 67Rally; 01-29-2014 at 06:38 PM.
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Old 01-30-2014, 12:31 PM
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Quote:
Originally Posted by TheJDMan View Post
Most rule books specify the DS loop be located no more than 6" behind the front U-joint. If you happen to have sub frame connectors installed that is a good place to mount a DS loop. There is no rule pertaining to the exhaust that I have ever seen.
Yup, yup. Agreed.

Ideally, the H and/or X pipes are placed at the optimum distance in the exhaust system to help relieve the "exhaust pulse traffic" to increase power. Of course packaging can be a challenge, preventing us from placing them at the optimum points. But if the H and/or X are placed too far from optimum, they will actually hurt power output.

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Old 09-12-2015, 11:41 PM
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Keep it to the front. If you break a front u joint, the shaft is still bolted to the pinion...there is no way to stop the pinion from spinning. Plus the flying front end is to close to me for comfort. If you break a rear joint, your first reaction will be to put it in neutral, or push in the clutch. Therefore removing the force that is spinning it. Also, the transmission has a slip joint, so the broken shaft will more than likely slip out.

Just my .02,
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