Driveshaft Safety Loop Q's

[TheJDMan]

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.

[67Rally]

Originally Posted by TheJDMan

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.

[67Rally]

Here are the quotes:

With a driveshaft loop you are pretty limited, the X has to go behind the safety loop.

And

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.

[DBasher]

Learn something new everyday. Let me ask ya, if its mounted 6" off the front and the rear joint breaks would it hit the ground?

The only loop I've put on is our Studebaker and its more toward the rear. I know that where its located either end can break and neither hit the ground. Just curious.

Dan

[67Rally]

Originally Posted by DBasher

Learn something new everyday. Let me ask ya, if its mounted 6" off the front and the rear joint breaks would it hit the ground?

The only loop I've put on is our Studebaker and its more toward the rear. I know that where its located either end can break and neither hit the ground. Just curious.

Dan

Yes, it would still hit the ground, but it would just drag. I think the real fear is that if the front lets go, it could tear up the tunnel and anything (anyone) directly above it.

There's no reason why you couldn't run two loops. One front and one rear, but the NHRA rules require only the front one.

[OBeer-WAN-Kenobi]

Originally Posted by 67Rally

...I think the real fear is that if the front lets go, it could tear up the tunnel and anything (anyone) directly above it....

Not to mention, possibly pole vaulting the car ass over tea kettle.

[67Rally]

Originally Posted by OBeer-WAN-Kenobi

Not to mention, possibly pole vaulting the car ass over tea kettle.

Has this ever really happened?

[intocarss]

Originally Posted by 67Rally

Yes, it would still hit the ground, but it would just drag. I think the real fear is that if the front lets go, it could tear up the tunnel and anything (anyone) directly above it.

There's no reason why you couldn't run two loops. One front and one rear, but the NHRA rules require only the front one.

SOME CARS IN NHRA REQUIRE 2 LOOPS

[67Rally]

Originally Posted by intocarss

SOME CARS IN NHRA REQUIRE 2 LOOPS

I wasn't even thinking about those classes. That was me speaking out of ignorance, thanks for pointing that out.

[Ron Sutton]

Originally Posted by TheJDMan

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.