Fast is relative, Hemi vs. Hemi

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From a 1973 publication:
'Booby Isaac set an all time Nascar speedway lap record of 201.10 mph with a Dodge Daytona model at Talledaga in 1970.'

'The fastest were said to hit speeds from 210-215 mph on the back straightaway at Daytona'
 
dirty white boy said:
yall act like its hard for a mopar to hit 140+ ,..hell ive been that fast in a 80,000 lb peterbilt a many times!!
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You survived 140+ MPH in a Semi falling off a 1000+ ft cliff? Many times? Amazing. (Although due to air drag. Not sure even free fall could get to 140 MPH? But maybe?)
 
any kinda down hill,..hell got 80,000 pushing it,...600 hp 2500 ftlbs pulling it!! cant do it just any wheres, cross west tx az and nm on i-10 and i-20 got a few locations that works well!!
 
I find it amusing you guys think a Hemi Charger could not do 150 mph with your calculations and assumptions. Turns out the Charger was a 12.5:1 Hemi with an unknown cam. I used to run the 64 Barracuda up to 140 mph every month when I lived in South Dakota. That was with a 273 and 4 speed, not stock. The car was stable and could have gone faster. I was aware that if anything happened at that speed, I'd be gone, but I was in my 20's and invincible. Where I wound it up was nothing but flat pasture land, so the most I would take with me was some fencing. A drag race car is different from a high speed car. You should put down the calculators and book specs and build and drive something. If you talk to some of the old timers, they will tell you that a good Hemi would do 425 hp with one plug wire pulled. Race hemis, were also under rated. However, I do agree 200+ mph was NASCAR territory.
 
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66fs said:
I find it amusing you guys think a Hemi Charger could not do 150 mph with your calculations and assumptions. Turns out the Charger was a 12.5:1 Hemi with an unknown cam. I used to run the 64 Barracuda up to 140 mph every month when I lived in South Dakota. That was with a 273 and 4 speed, not stock. The car was stable and could have gone faster. I was aware that if anything happened at that speed, I'd be gone, but I was in my 20's and invincible. Where I wound it up was nothing but flat pasture land, so the most I would take with me was some fencing. A drag race car is different from a high speed car. You should put down the calculators and book specs and build and drive something. If you talk to some of the old timers, they will tell you that a good Hemi would do 425 hp with one plug wire pulled. Race hemis, were also under rated. However I do agree 200+ mph was NASCAR territory.
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Most those who run at Bonneville looking to make the 200+ MPH club can contest there is a big difference between 150 and 200 MPH. It's part of the reason why NHRA mandates parachute starting at 150. Not only power requirements. But air flow becomes far more critical. And of course. More dangerous. Even today's designs that have the airflow requirements Autocad into the body/chassis and suspension design do so with warning of 200 MPH. The physics of hi speed driving change rapidly starting at 150 MPH.
 
cojohnso said:
Most those who run at Bonneville looking to make the 200+ MPH club can contest there is a big difference between 150 and 200 MPH. It's part of the reason why NHRA mandates parachute starting at 150. Not only power requirements. But air flow becomes far more critical. And of course. More dangerous. Even today's designs that have the airflow requirements Autocad into the body/chassis and suspension design do so with warning of 200 MPH. The physics of hi speed driving change rapidly starting at 150 MPH.
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I find it hard to believe anyone is using using Autocad to design car bodies.
 
66fs said:
It would be interesting to know what they use now. Including aerodynamics and air flow.
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When I took CFD (Computational Fluid Dynamics) in grad school Fall 2020 we used ANSYS Fluent. That's one of the big programs for simulating liquid, gas and heat flow. I wanted to do a 2D simulation of airflow over my Duster but couldn't find a model online and didn't feel like making one lol. For one assignment we had to simulate turbulent airflow over a passenger airliner, very cool stuff. These modern programs are extremely powerful.

SolidWorks is currently the most popular 3D modeling software for making parts and assemblies. Like AutoCAD but much better lol. I use it at work from time to time.
 
Boeing used to use CATIA, might still be. When I was interning there, I got every available hour of training I could because I heard Chrysler was using it as well to model things like heater/AC ducting. Not hard to imagine they would use it for more than just that.

Funny thing about 3D software...there are multiple uses and each seems to have tools that work better depending on the case. As an example, Revit is the go to standard for Architects, but it sucks for detailing the actual building members for a shop to fabricate them. And you wouldn't use SolidWorks to model a building as it is much more suited to manufacturing complex assemblies, like a camera body or carburetor. And AutoCAD, while it will do 3D stuff, is really much more of a 2D line drawing package. All pointless to the discussion, but a nuance that it seems lots of people miss.

Not schooling anyone, just saying.
 
DionR said:
Boeing used to use CATIA, might still be. When I was interning there, I got every available hour of training I could because I heard Chrysler was using it as well to model things like heater/AC ducting. Not hard to imagine they would use it for more than just that.

Funny thing about 3D software...there are multiple uses and each seems to have tools that work better depending on the case. As an example, Revit is the go to standard for Architects, but it sucks for detailing the actual building members for a shop to fabricate them. And you wouldn't use SolidWorks to model a building as it is much more suited to manufacturing complex assemblies, like a camera body or carburetor. And AutoCAD, while it will do 3D stuff, is really much more of a 2D line drawing package. All pointless to the discussion, but a nuance that it seems lots of people miss.

Not schooling anyone, just saying.
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In the mid 80s working for Honeywell. We used ComputerVision CAD/CAM system. On a Sun/Unix platform. I was an Engr aide and not a draftsman. But used for 2D product graphics. A layman to its full design capabilities. My understanding that it was bought by another company. And is used primarily in ship building industry today.

The point? These products seem to be more specific to manufacturing efforts they support. I'm not sure what today's grad school car designers are using for some of their farout concept car designs? But I can only imagine the complexity of today's systems. Making design errors almost a thing of the past. No more bolt that can't be reached without removal of an unrelated module. Lol. (Unless designed as such. Errrrr.)
 
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66fs said:
I used to run the 64 Barracuda up to 140 mph every month when I lived in South Dakota. That was with a 273 and 4 speed, not stock. The car was stable and could have gone faster. I was aware that if anything happened at that speed, I'd be gone, but I was in my 20's and invincible. Where I wound it up was nothing but flat pasture land, so the most I would take with me was some fencing.
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I used to have to see how fast whatever I was driving would go. Young and invincible indeed. Strange thing is that back then I was more afraid of dying than I am now, but I took more risks than I do now. Trying to stretch out whatever time I have left as far as it will go, I reckon. Anyway, I had a mildly modified 73 Duster 340 when I worked in South Georgia - land of long, straight, empty stretches of road. Let it out on one such stretch of road, got it up to 5,800 rpm in high gear, whatever mph that works out to with auto trans and 3.21 rear gears. Went over a mild dip, didn't upset the car, but coming through it the back squatted down and I heard something scrape. Figured it was probably a muffler, no big deal, so just drove on to the next town, where I noticed I was just about out of gas. Pulled into a gas station to fill up. As I did, the gas station attendant warned me that my tank was leaking. I had punctured a hole in the tank. A small one, but enough to nearly empty the tank pretty quickly. The station attendant got a sheet metal screw and screwed it into the hole. That stopped the leak, and on I went. That screw stayed there the rest of the time I had the car, and never leaked a drop.
 
65 Cuda 340 said:
I used to have to see how fast whatever I was driving would go. Young and invincible indeed. Strange thing is that back then I was more afraid of dying than I am now, but I took more risks than I do now. Trying to stretch out whatever time I have left as far as it will go, I reckon. Anyway, I had a mildly modified 73 Duster 340 when I worked in South Georgia - land of long, straight, empty stretches of road. Let it out on one such stretch of road, got it up to 5,800 rpm in high gear, whatever mph that works out to with auto trans and 3.21 rear gears. Went over a mild dip, didn't upset the car, but coming through it the back squatted down and I heard something scrape. Figured it was probably a muffler, no big deal, so just drove on to the next town, where I noticed I was just about out of gas. Pulled into a gas station to fill up. As I did, the gas station attendant warned me that my tank was leaking. I had punctured a hole in the tank. A small one, but enough to nearly empty the tank pretty quickly. The station attendant got a sheet metal screw and screwed it into the hole. That stopped the leak, and on I went. That screw stayed there the rest of the time I had the car, and never leaked a drop.
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g'pa's new yorker would drag the rear bumper bout where it ran outta numbers at...120!
 
dirty white boy said:
now thats just crazy!
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That is indeed a wicked big rig. I have seen Shockwave probably 4 times at Atco Dragway. The afterburner pops you can feel through your body. When it leaves the starting line and races past it kinda feels like when you open the oven door to check your pizza.
 
MopaR&D said:
When I took CFD (Computational Fluid Dynamics) in grad school Fall 2020 we used ANSYS Fluent. That's one of the big programs for simulating liquid, gas and heat flow. I wanted to do a 2D simulation of airflow over my Duster but couldn't find a model online and didn't feel like making one lol. For one assignment we had to simulate turbulent airflow over a passenger airliner, very cool stuff. These modern programs are extremely powerful.

SolidWorks is currently the most popular 3D modeling software for making parts and assemblies. Like AutoCAD but much better lol. I use it at work from time to time.
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We used to refer to Autocad as Etch a Sketch. I'm still using Solidworks and have used it since it came out. Solidworks has embedded FEA, but that would get me real close. In the end, my models would be checked with ANSYS or the other big structural software (can't remember), then we would tweak the model to make it strong enough to do what we needed. I also used CFD thermal modeling a long time ago. Guys at work use fluid modeling, but that is a whole different thing.
 
65 Cuda 340 said:
I used to have to see how fast whatever I was driving would go. Young and invincible indeed. Strange thing is that back then I was more afraid of dying than I am now, but I took more risks than I do now. Trying to stretch out whatever time I have left as far as it will go, I reckon. Anyway, I had a mildly modified 73 Duster 340 when I worked in South Georgia - land of long, straight, empty stretches of road. Let it out on one such stretch of road, got it up to 5,800 rpm in high gear, whatever mph that works out to with auto trans and 3.21 rear gears. Went over a mild dip, didn't upset the car, but coming through it the back squatted down and I heard something scrape. Figured it was probably a muffler, no big deal, so just drove on to the next town, where I noticed I was just about out of gas. Pulled into a gas station to fill up. As I did, the gas station attendant warned me that my tank was leaking. I had punctured a hole in the tank. A small one, but enough to nearly empty the tank pretty quickly. The station attendant got a sheet metal screw and screwed it into the hole. That stopped the leak, and on I went. That screw stayed there the rest of the time I had the car, and never leaked a drop.
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140 mph was enough for me. Stuff would absolutely fly by. I'd think of that song "Hot rod Lincoln", what a ride. My suspension was pretty heavy duty for the day and ran whatever tires the state highway patrol was running.
 
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