Any know why NASCAR doesn’t allow tailpipes out the rear of the car?

[ActionfigureJoe]

No googling. 

[Zambroski]

I think it's something to do with Lynyrd Skynyrd and Charlie Daniels?

Just guessing.

[ActionfigureJoe]

2 minutes ago, Zambroski said:

I think it's something to do with Lynyrd Skynyrd and Charlie Daniels?

Just guessing.

Not even a good guess. I did get to see them twice during the mid “70’s at the old St Paul Civic Center. The smell of Mexico was everywhere. 
 

 

[awful knawful]

Safety

[ActionfigureJoe]

16 minutes ago, awful knawful said:

Safety

That’s one reason. There’s two others. here’s a hint, Junior Johnson used it to his advantage before it was banned. 

[IRONDOG]

Drafting? Is drafting banned??

[ActionfigureJoe]

21 minutes ago, IRONDOG said:

Drafting? Is drafting banned??

Junior Johnson lost about 5hp when he ran the tailpipes, but he gained an advantage. The hot air coming out of his exhaust would do two things. Introduce dirty air into the slip stream behind his car making it more difficult to draft. The heat of the exhaust would also raise the coolant temp of the drafting car by 40-50 degrees. On top of that he was gassing out the driver of the drafting car. Junior was notorious for always trying the find that extra edge. 

[Doug]

6 minutes ago, ActionfigureJoe said:

Junior Johnson lost about 5hp when he ran the tailpipes, but he gained an advantage. The hot air coming out of his exhaust would do two things. Introduce dirty air into the slip stream behind his car making it more difficult to draft. The heat of the exhaust would also raise the coolant temp of the drafting car by 40-50 degrees. On top of that he was gassing out the driver of the drafting car. Junior was notorious for always trying the find that extra edge. 

Smokey Yunick started cutting the floor boards out to tuck the exhaust up for a flat bottom and create ground effects.  Nascar also outlawed that.

[hayward]

13 minutes ago, ActionfigureJoe said:

Junior Johnson lost about 5hp when he ran the tailpipes, but he gained an advantage. The hot air coming out of his exhaust would do two things. Introduce dirty air into the slip stream behind his car making it more difficult to draft. The heat of the exhaust would also raise the coolant temp of the drafting car by 40-50 degrees. On top of that he was gassing out the driver of the drafting car. Junior was notorious for always trying the find that extra edge. 

Good info.  But I can't believe doing that would raise temps. 40-50 degrees.  I mean, thinking about it, the car behind would have to be practically glued to the back bumper of the car in front for a substantial amount of time.

But maybe, hell I don't know?

[ActionfigureJoe]

15 minutes ago, hayward said:

Good info.  But I can't believe doing that would raise temps. 40-50 degrees.  I mean, thinking about it, the car behind would have to be practically glued to the back bumper of the car in front for a substantial amount of time.

But maybe, hell I don't know?

I’m not sure if you watch much nascar, but they can run 1-5 feet when drafting  the car in front. That area became a dead zone that gets superheated by the exhaust. At those speeds and power output, it doesn’t take much to run out of cooling capacity. 

[favoritos]

I'd never thought much about the effect of exhaust when they are drafting.  It does make some sense with the "vacuum" in the pocket.  That air doesn't get near the blending.  I'm a little surprised the side air doesn't get pulled in enough to still make it an issue.

Some of this stuff sounds a little fluffed.  I would think weight loss and power gain would be big factors with side exits.  In the big picture I'd think that's more important than whether the guy following you is running hot.

[ActionfigureJoe]

2 minutes ago, favoritos said:

I'd never thought much about the effect of exhaust when they are drafting.  It does make some sense with the "vacuum" in the pocket.  That air doesn't get near the blending.  I'm a little surprised the side air doesn't get pulled in enough to still make it an issue.

Some of this stuff sounds a little fluffed.  I would think weight loss and power gain would be big factors with side exits.  In the big picture I'd think that's more important than whether the guy following you is running hot.

During the brickyard race, Buddy Baker claimed his coolant temp rose to 250F from the normal 190F while drafting Junior. 

[Matt]

47 minutes ago, favoritos said:

I'd never thought much about the effect of exhaust when they are drafting.  It does make some sense with the "vacuum" in the pocket.  That air doesn't get near the blending.  I'm a little surprised the side air doesn't get pulled in enough to still make it an issue.

Some of this stuff sounds a little fluffed.  I would think weight loss and power gain would be big factors with side exits.  In the big picture I'd think that's more important than whether the guy following you is running hot.

The amount of air coming out of a 5.9L engine turning 9000 RPM is enough to knock you on your ass.  It's a ton of superheated air blowing out of those air pumps.

[hayward]

2 hours ago, ActionfigureJoe said:

I’m not sure if you watch much nascar, but they can run 1-5 feet when drafting  the car in front. That area became a dead zone that gets superheated by the exhaust. At those speeds and power output, it doesn’t take much to run out of cooling capacity. 

No, hardly ever.  Interesting though.

[XCR1250]

3 hours ago, Doug said:

Smokey Yunick started cutting the floor boards out to tuck the exhaust up for a flat bottom and create ground effects.  Nascar also outlawed that.

https://en.wikipedia.org/wiki/Smokey_Yunick

[ActionfigureJoe]

1 minute ago, XCR1250 said:

https://en.wikipedia.org/wiki/Smokey_Yunick

Who was the racer that dipped his car in acid to cut weight? 

[XCR1250]

18 minutes ago, ActionfigureJoe said:

Who was the racer that dipped his car in acid to cut weight? 

Acidic Jones

[Kivalo]

NASCAR is so gay they should just use Mazda Miatas.

[Frostynuts]

9 hours ago, Kivalo said:

NASCAR is so gay they should just use Mazda Miatas.

 

9 hours ago, Kivalo said:

NASCAR is so gay they should just use Mazda Miatas.

I agree, but only if they have 347 ford stroker motors installed in them, like mine ! LOL

Edited October 28 by Frostynuts

[Kivalo]

6 hours ago, Frostynuts said:

 

I agree, but only if they have 347 ford stroker motors installed in them, like mine ! LOL

No. Come on, you dont really own a miata, do you?

[Frostynuts]

16 hours ago, Kivalo said:

No. Come on, you dont really own a miata, do you?

Yup, a MONSTER MIATA, a Corvette, and a %.0 Mustang GT. I enjoy cars ! 

Edited October 29 by Frostynuts

[Highmark]

On 10/27/2024 at 6:01 PM, ActionfigureJoe said:

Junior Johnson lost about 5hp when he ran the tailpipes, but he gained an advantage. The hot air coming out of his exhaust would do two things. Introduce dirty air into the slip stream behind his car making it more difficult to draft. The heat of the exhaust would also raise the coolant temp of the drafting car by 40-50 degrees. On top of that he was gassing out the driver of the drafting car. Junior was notorious for always trying the find that extra edge. 

I forget who but a great NASCAR cheating story was when they weighted the car prior to race or qualifying and a team would fill the chassis tubes with lead shot.   When out on the track the driver would pull a lever or what not opening the tube for the shot to spill out and hopefully go up against the wall. 

[Doug]

2 hours ago, Highmark said:

I forget who but a great NASCAR cheating story was when they weighted the car prior to race or qualifying and a team would fill the chassis tubes with lead shot.   When out on the track the driver would pull a lever or what not opening the tube for the shot to spill out and hopefully go up against the wall. 

Junior Johnson with Darrell Waltrip as the driver

[Highmark]

6 minutes ago, Doug said:

Junior Johnson with Darrell Waltrip as the driver

Didn't they put NoS on a car during Daytona qualifying too?    

[Doug]

Nascar really has this next gen car locked down and it's limiting the old school or really any enginuity.

The cars go into a tent and lazer measured now.  The teams are pushing things far as they can which is not much.  Before the car goes through the inspection tent most of the top teams have their crew use umbrellas to actually shield the car from the sun.  If not just the expansion in the windshield and rear window could put the car out of tolerance.