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Author
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Topic: Drive shaft loop
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Glens67
Gearhead Posts: 325
From: Petaluma
Registered: Mar 2002
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posted 08-13-2003 03:01 PM
   
What is then NHRA requirments on a Street Car? Time, Tire, NO guesses please------------------
Glen
67 GT 390
65 Galaxie 500 XL 4 Speed
It was not a Red Light they gave me a Slow Tree
I WAS NOT LATE the Tree was Fast
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kid vishus
Gearhead Posts: 4538
From: middle of NC
Registered: Oct 2000
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posted 08-13-2003 03:24 PM
It used to be 13.99 and quicker with slicks. I don't know if it has changed or not as it has been several years since I have been an NHRA member.
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steve'66
Gearhead Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-13-2003 03:39 PM
Glen, Here you go from the rule book;2.2 DRIVELINE Drive shaft loop required on all cars running 13.99 (*8.59) or quicker (except vehicles running 13.00 (*8.14) or slower cars equipped with street tires.) See General Regulations 2.4. General Regs. 2.4 describes the construction of the loop and that it has to be w/i 6"s of the front u-joint. SteveW
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Glens67
Gearhead Posts: 325
From: Petaluma
Registered: Mar 2002
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posted 08-13-2003 03:41 PM
Thanks Kid
I'm going to Somoa this week end and want to make sure that Loops are not required on a 12 second street car. I had to remove the loop when I installed the subframe connectors and subframe cage not much room with 3" pipes. I will install one soon but not befor this weekend.
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Glens67
Gearhead Posts: 325
From: Petaluma
Registered: Mar 2002
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posted 08-13-2003 03:43 PM
Is the street tire the out on that rule?
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steve'66
Gearhead Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-13-2003 04:07 PM
Glen,Yeah with street tires you can go as quick as a 13.0 1/4mi. Don't worry, I can't imagine them crawling under your car to look.  If they do you'll just have to slow it down a little.  SteveW
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jkilroy
Gearhead Posts: 1719
From: Vicksburg, MS
Registered: Dec 99
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posted 08-13-2003 10:22 PM
Drive shaft loops are cheap and one of the most basic of safety devices.DON'T SCRIMP ON SAFETY!!!!! If you have ever seen someone pitch a drive shaft at speed you would be lining up to buy a loop. ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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Ryan Wilke
Gearhead Posts: 1501
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 08-14-2003 08:42 AM
quote:
Originally posted by jkilroy:
Drive shaft loops are cheap and one of the most basic of safety devices.DON'T SCRIMP ON SAFETY!!!!! If you have ever seen someone pitch a drive shaft at speed you would be lining up to buy a loop.
A couple of years ago, I "tested" my driveshaft loop at the launch pad; I'm sure my floorboards would of been beat all to HE!! if I didn't have one. Yeah, it was embaressing, and we had to pick up the remains of the U-joint off the track and push the car back off and away, but the loop did it's job. I would HATE MYSELF if someone who was standing by the fence was hurt from a piece of flying metal - even though the loop wouldn't of contained all the pieces, at least I (and the track owner) would know that I was following the rules........ Ryan
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kid vishus
Gearhead Posts: 4538
From: middle of NC
Registered: Oct 2000
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posted 08-14-2003 08:55 AM
quote:
Originally posted by Ryan Wilke:
A couple of years ago, I "tested" my driveshaft loop at the launch pad...
I tested the loop in my Granada several years ago. But my U-joint let go on the 1-2 shift. It wasn't pretty. The loop did it's job, which was a good news, bad news kind of thing. Good news; the loop worked and kept the driveshaft from digging into the asphalt. Bad news; the loop worked causing the busted driveshaft to beat on the yoke hanging out the back of the trans as I tried to get stop, breaking the tailshaft housing, breaking the bellhousing almost all the way around, breaking the snout off the starter, and breaking one corner off the block.
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bluestreek
Gearhead Posts: 1289
From: Athens,GA
Registered: Jul 2001
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posted 08-14-2003 05:39 PM
quote:
Originally posted by kid vishus:
Bad news; the loop worked causing the busted driveshaft to beat on the yoke hanging out the back of the trans as I tried to get stop, breaking the tailshaft housing, breaking the bellhousing almost all the way around, breaking the snout off the starter, and breaking one corner off the block.
Anyway to prevent that sort of thing from happening? ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)full street trim!
DanH
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kid vishus
Gearhead Posts: 4538
From: middle of NC
Registered: Oct 2000
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posted 08-14-2003 07:47 PM
In most cases, I think the U-joint breaks right on the starting line and doesn't cause so much carnage. In my case, I was already moving at a pretty good clip and didn't get stopped right away. I really had no idea what was going on. When I launched, it had a vibration, I remember thinking "what is that?". Then the shift lite came on and out of instinct I pulled it into second gear. At that exact point, it felt like the while car was coming apart. It actually felt like the rear end was trying to come out of the car it shook and bucked so badly. The rear view mirror fell off the windshield, and my fire extinguisher mount broke and it went flying out of it's mount. All I knew was I needed to get over next to the guardrail and get stopped. To top it off, it was 4th or 5th round of elims, and I tree'd my opponent badly.
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capri man
Gearhead Posts: 3385
From: doerun, ga.
Registered: Nov 2000
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posted 08-14-2003 08:15 PM
i hate it when that happens kv!!! a loop in the front and the rear of the driveshaft aint a bad idea.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
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bluestreek
Gearhead Posts: 1289
From: Athens,GA
Registered: Jul 2001
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posted 08-14-2003 10:48 PM
Dangit KV!! I hate to hear when a car comes apart like that, but that was a funny story!! I couldn't help but laugh when I read it.  ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)full street trim!
DanH
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kid vishus
Gearhead Posts: 4538
From: middle of NC
Registered: Oct 2000
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posted 08-15-2003 07:42 AM
quote:
Originally posted by bluestreek:
Dangit KV!! I hate to hear when a car comes apart like that, but that was a funny story!! I couldn't help but laugh when I read it.
That was definately a learning experiance. That must have happened around '94 or '95. Since then, I keep a much closer eye on the condition of the u-joints.
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